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iC-NZN
N-TYPE LASER DIODE DRIVER
y inar im prel
Rev A1, Page 1/16 APPLICATIONS o Pulsed and CW laser diode modules o Laser diode pointers o Laser levels o Bar-code readers o Distance measurement o Blue laser diodes
FEATURES o Peak value controlled laser diode driver for operation from CW up to 155 MHz o Spike-free switching of laser currents of up to 300 mA o Setting of laser power (APC) via external resistor o Optional current control (ACC) o Laser current limitation o LVDS/TTL switching input with TTL monitor output o Low current consumption sleep-mode < 50 A o Safety shutdown with overtemperature o Error signal output with overtemperature, undervoltage and overcurrent o All current LD types can be used (N/P/M configurations) o Blue laser diodes supported o Fast soft-start o Strong suppression of transients with small external capacitors
PACKAGES
QFN24 4 mm x 4 mm
BLOCK DIAGRAM
RVDD
+3..+5.5V
VDD i(RSI)x540 LDA MONITOR
LDA
CVDD
100 nF.. RSI 0.68.. 9k
RSI NSLP
VDD
iC-NZN
& 1
CLDA
IMON LDK
N ..300mA
100 nF..
REGE
AVG VSY SYN EP EN
VDD
& REF LVDS/TTL + -
+
x240
CI
ECI
CI
CIS
..10 nF..
TTL CID INPUT INTERFACE NERR OverTemp. 1 OverCurrent Low V(LDA) Bandgap, Reference, Overtemp OUTPUT MONITOR T.PAD GND ECI OUTPUT DRIVER
AGND MD
RMD
GND
PMD
RGND
suitable laser diode configurations
N
M
P
Copyright (c) 2010 iC-Haus
http://www.ichaus.com
iC-NZN
N-TYPE LASER DIODE DRIVER
y inar im prel
Rev A1, Page 2/16
DESCRIPTION Laser diode pulse driver iC-NZN allows CW operation of laser diodes and spike-free switching with defined current pulses up to 155 MHz. The optical output power of the laser diode is set-up by means of an external resistor (RMD/PMD). For laser current control without a monitor diode, the laser current monitor at pin IMON is utilised. For high pulse frequencies the device can be switched into controlled burst mode. A previously settled operating point is maintained throughout the burst phase. An averaging current monitor can be set by means of an external resistor at pin RSI. When the current limit is reached, overcurrent is signalled at NERR and the current from pin LDA is limited to the pre-set value but the iC is not shut down. There is an additional current limitation in pin LDK that prevents the iC from overpowering the laser diode. Setting pin NSLP low, the iC enters a low consumption sleep-mode (< 50 A typ.).
PACKAGES QFN24 4 mm x 4 mm to JEDEC PIN CONFIGURATION PIN FUNCTIONS No. Name Function
22 21 20 19
24
23
1 2 3 4 5 6
18 17 16
NZN code... ...
15 14 13
7
8
9
10
11
12
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
VDD AVG MD IMON CID EP EN TTL VSY SYN RGND RVDD LDK AGND CIS CI LDA
Power Supply Enable Averaging Control APC setup, monitor input Laser Current Monitor Enable Pulldown Current at CI Positive LVDS/TTL switching input Negative LVDS switching input Enable TTL input Sync Output Supply Voltage Sync Output Reference Ground Reference (P-type laser diodes) Laser Diode Cathode Analog ground Power Control Capacitor sense Power Control Capacitor Laser Diode Anode n/c RSI Current Monitor Setup REGE Control Enable GND Ground NSLP Not Sleep-Mode NERR Error Output n/c
The Thermal Pad is to be connected to a Ground Plane (GND) on the PCB. Only pin 1 marking on top or bottom defines the package orientation ( NZN label and coding is subject to change).
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 3/16
ABSOLUTE MAXIMUM RATINGS
Beyond these values damage may occur; device operation is not guaranteed. Item No. Symbol Parameter Voltage at VDD Current in VDD Current in CI Current in NERR Current in MD Current in EP, EN, TTL, REGE, NSLP, AVG, CID Current in LDK Current in LDA Current in RSI Current in VSYNC Current in SYNC Current in IMON Voltage at RSI, VSY, SYN, EP, EN, TTL, REGE, AVG, CID, RGND, MD, CI, IMON, RVDD, LDA, NERR, NSLP Voltage at LDK ESD Susceptibility at all pins Operating Junction Temperature Storage Temperature Range HBM, 100 pF discharged through 1.5 k -40 -40 DC current DC current DC current V(LDA) = 0 Conditions Min. -0.7 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2 -2 -0.7 Max. 6 1200 5 20 20 20 1200 1200 20 50 50 20 6 V mA mA mA mA mA mA mA mA mA mA mA V Unit
G001 VDD G002 I(VDD) G003 I(CI) G004 I(NERR) G005 I(MD) G006 I()dig G007 I(LDK) G008 I(LDA) G009 I(RSI) G010 I(VSY) G011 I(SYN) G012 I(IMON) G013 V()c
G014 V()h G015 Vd() G016 Tj G017 Ts
-0.7
15 4 190 190
V kV C C
THERMAL DATA
Operating Conditions: VDD = 3...5.5 V Item No. T01 T02 Symbol Ta Rthja Parameter Operating Ambient Temperature Range Thermal Resistance Chip/Ambient surface mounted, thermal pad soldered to ca. 2 cm heat sink Conditions Min. -20 30 Typ. Max. 125 40 C K/W Unit
All voltages are referenced to ground unless otherwise stated. All currents flowing into the device pins are positive; all currents flowing out of the device pins are negative.
iC-NZN
N-TYPE LASER DIODE DRIVER
y inar im prel
Rev A1, Page 4/16
ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3...5.5 V, VSY = 0 V...VDD, Tj = -20...125 C, NSLP = hi, CID = lo; unless otherwise stated Item No. 001 002 003 004 005 006 007 008 Symbol Parameter Conditions Min. VDD VSY Ioff(VDD) Idc(VDD) I(VSY) Tab VDDon Vc()hi Permissible Supply Voltage Permissible Supply Voltage at VSY Supply Current in VDD Supply Current in VDD Supply Current in VSY Thermal Shutdown Threshold Power-On Threshold Clamp Voltage hi at RSI, TTL, REGE, MD, CI, LDA, NSLP, IMON Clamp Voltage hi at LDK Clamp Voltage lo at VDD, AVG, MD, IMON, CID, EP, EN, TTL, VSY, SYN, RGND, RVDD, LDK, AGND, CI, LDA, RSI, REGE, NSLP, NERR I() = 0.1 mA, other pins open, VDD = 0 VSY VDD NSLP = lo, all other input pins set to lo RSI 680 SYN pin open 130 1.7 0.3 3 3 5 10 Typ. Max. 5.5 5.5 50 15 10 196 2.8 1.5 V V A mA A C V V Unit
Total Device
009 010 011
Vc()hi Vc()hi Vc()lo
Clamp Voltage hi to VSY at SYN I() = 1 mA, other pins open, VSY = 0 I() = 1 mA, other pins open I() = 1 mA, other pins open
0.3 12 -1.5 -0.65
1.5 -0.3
V V V
012 101 102 103 104
Vc()hi V(RSI) RSI VLDA Ierr(LDA)
Clamp Voltage hi at VSY, EP, EN I() = 1 mA, other pins open, VDD = 0 Voltage at RSI Permissable Resistor at RSI LDA Voltage Monitor Threshold VDD = 3...3.5 V VDD = 4.5...5.5 V VDD - V(LDA), V(RSI) = VDD 430 2.5 0.68 400 400 260 100 V(LDA) = 0 V VDD = 4.5...5.5 V VDD = 3...3.5 V V(LDK) = V(REGE) = V(TTL) = V(EP) = VDD, V(MD) = 0 V VDD = 4.5...5.5 V VDD = 3...3.5 V RSI = 0.68 K VDD = 5.5 V NSLP = lo, V(LDA) = VDD 1 460 510 500 520
6 580 9 9 630 850 600
V mV k k mV mA mA nF
Current Monitor RSI, LDA
Maximum Unlimited current from V(RSI) = VDD; VDD = 4.5...5.5 V LDA without error signaling VDD = 3...3.5 V
105 106
Cmin(LDA) Minimum capacitor needed at LDA rILDA Current Ratio I(LDA)max / I(RSI)
470 430
610 610
107
rILDK
Current Ratio I(LDK)max / I(RSI)
400 480
960 870 630 20 560 mA k mV
108 109 201
i(ldk)
Maximum limited current
Rdis(LDA) Discharge Resistor at LDA V(MD)
Reference V(MD) - V(RGND), closed control loop V(RVDD) - V(MD) for P-type LD or ACC Temperature Drift of Voltage at MD V(MD) - V(RGND) Input Voltage Range at EP, EN Input Differential Voltage at EP, EN Differential Input Impedance at EP, EN closed control loop V(EP) = 0 V, V(AVG) = 0 V, N-type LD TTL = lo, VDD = 3.0...5.5 V TTL = lo, Vd() = |V(EP) - V(EN)| TTL = lo V(EP), V(EN) < VDD - 1.5 V 460 0.6 200 0.6 3 2 0.8
202 203 301 302 303 304 305
dV(MD) V(MD) Vin() Vd() R() Vt(EP)hi Vt(EP)lo
120 510 550 VDD 1.4
V/C mV V mV k V V
Digital Inputs/Outputs
Input Threshold Voltage hi at EP TTL = hi, EN = open Input Threshold Voltage lo at EP TTL = hi, EN = open
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 5/16
ELECTRICAL CHARACTERISTICS
Operating Conditions: VDD = 3...5.5 V, VSY = 0 V...VDD, Tj = -20...125 C, NSLP = hi, CID = lo; unless otherwise stated Item No. 306 307 308 309 310 311 312 313 314 315 316 317 318 Symbol Vhys(EP) Ipd(EP) Vt()hi Vt()lo Vhys() Ipu() Ipd() Vs()hi Vs()lo Isc()hi Isc()lo I(NERR) Vs()lo Parameter Hysteresis at EP Pull-Down Current at EP Input Threshold Voltage hi at TTL, REGE, NSLP, AVG, CID Input Threshold Voltage lo at TTL, REGE, NSLP, AVG, CID Hysteresis at TTL, REGE, NSLP, AVG, CID Pull-Up Current at TTL, REGE V() = 0...VDD - 1.2 V Pull-Down Current at NSLP, AVG, V() = 1 V...VDD CID Saturation voltage hi at SYN Saturation voltage lo at SYN Short-circuit Current hi at SYN Short-circuit Current lo at SYN Current in NERR Saturation Voltage lo at NERR Vs(SYN)hi = VSY - V(SYN), I() = -1 mA, VSY = VDD, EP = TTL = High, EN = open I() = 1 mA, TTL = High, VSY = VDD, EP = Low, EN = open EP = TTL = High, EN = open, V(SYN) = 0 V, VSY = VDD EP = TTL = High, EN = open, V(SYN) = 0 V, VSY = VDD V(NERR) > 0.6 V, error I() = 1 mA, error I(LDK) = 300 mA, RSI = 680 , VDD=4.5...5.5 V I(LDK) = 100 mA, RSI = 680 VDD=4.5...5.5 V I(LDK) = 60 mA, RSI = 2.5 k VDD=3...3.5 V 1.6 1.2 0.8 -40 3 1 0.8 140 -60 2 230 -2 130 0.4 0.4 -3 25 20 600 2.9 2 1.3 300 12 0 iC active, REGE = hi, V(CI) = 1 V, CID = 0 V iC active, REGE = hi, V(CI) = 1 V, CID = VDD iC active, REGE = lo, CID = hi, V(CI) = 1 V, VDD = 3...5.5 V V(IMON) = VDD - 0.5 V, I(LDK) < 300 mA, VDD = 4.5...5.5 V 20 0.3 1/280 10 0 65 2.6 1/200 0.5 Conditions Min. TTL = hi, EN = open TTL = hi, EN = open, V() = 1 V...VDD 40 0.5 5 2 Typ. Max. mV A V V mV A A V V mA mA mA mV V V V mA V nF A A A I(LDK) mA Unit
Laser Driver LDK, CI, IMON 401 Vs(LDK)lo Saturation Voltage lo at LDK
402 403 404 405 406 407 408 409
Idc(LDK) Vo() C(CI) |I(CI)| Ipd(CI) Imon()
Permissible DC Current in LDK Permissible Voltage at LDK Required Capacitor at CI Charge Current from CI Pull-Down Current in CI Current at IMON
Imin(LDK) Minimum permissible current pulse Imax(LDK) Maximum obtainable current from V(REGE) = V(TTL) = V(EP) = VDD, the driver V(MD) = 0 V; VDD = 4.5...5.5 V VDD = 3...4.5 V twu tr tf tp Time to Wakeup: NSLP lo hi to system enable Laser Current Rise Time Laser Current Fall Time Propagation Delay V(EPx, ENx) I(LDKx) CLDA = 1 F, RSI = 680 VDD = 5 V see Fig. 2 VDD = 5 V see Fig. 2 VDD = 5 V
300 90 300 1.5 1.5 10
mA mA s ns ns ns
Timing 501 502 503 504
iC-NZN
N-TYPE LASER DIODE DRIVER
y inar im prel
Rev A1, Page 6/16
ELECTRICAL CHARACTERISTICS: DIAGRAMS
I(LED) tr
V VDD-0.45V Vt()hi Input/Output
tf
I pk
90% I pk
Vt()lo 0.45V t
1 0
10% I pk
t
Figure 1: Reference levels
Figure 2: Laser current pulse
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 7/16
DESCRIPTION OF FUNCTIONS iC-NZN is a laser diode pulse driver. The device features the following functions: * * * * Peak or averaging control Optical power (APC) or current control (ACC) Pulses of up to 155 MHz in controlled burst mode Laser current limitation * Extension of the laser current with few external components * Operation of blue laser diodes possible * Error signalling for overcurrent * Sleep mode with less than 50 A consumption
OPTICAL POWER CONTROL The iC-NZN supports the control of the laser diode's optical output power for all common laser diode pin configurations (N, P and M). The control is enabled with pin REGE set to high. With AVG set to low, the peak power control is enabled. The laser power level is selected by means of the resistor RMON (= RMD + PMD). This control mode can be used for frequencies up to ca. 4 Mhz. For higher frequencies the averaging control (AVG = high) or the burst mode have to be used. Tables 4 and 5 show how to set the inputs for laser control depending on the input interface selected (TTL or LVDS).
Laser control in TTL mode (TTL = high/open) EP EN NSLP REGE SYN Mode low/open Power-save mode low/open open high low LDA charged, laser off high open high high/open high LDA charged, laser on, peak control high open high low high LDA charged, laser on, burst mode Table 4: Laser control in TTL mode Laser control in LVDS mode (TTL = low) EP EN NSLP REGE SYN low/open < EN > EP high low > EN < EP high high/open high > EN < EP high low high
Mode Power-save mode LDA charged, laser off LDA charged, laser on, peak control LDA charged, laser on, burst mode
Table 5: Laser control in LVDS mode RMON dimensioning Peak control (AVG = low): In order to calculate the right value of RMON, the value of IM (monitor current with respect to optical output power) of the laser diode must be known. RMON must be chosen in a way that the monitor current generated by the desired output power creates a voltage drop across RMON of 500 mV (cf. Electrical Characteristics No. 201). Averaging control (AVG = high): In this mode the calculation is the same as in peak control, only the result has to be divided by the duty cycle of the laser pulses, 1 D = T . At a duty cycle of e.g. 50% D = 2 . This requires an external averaging capacitor of sufficient size at pin CI though. Control modes Averaging Operation mode RMON calculation AVG = 0 AVG = 1 Peak control RMON = Averaging control RMON = Table 6: RMON dimensioning
V (MD) IM V (MD) IMxD
Example By way of example, an output level of 1 mW is to be set. With an optical power of 1 mW e.g. laser diode HL6339G has a typical monitor current (IM) of 15 A. The following value is then obtained for the resistor at pin MD (RMON = PMD + RMD, where RMD is a fixed resistor and PMD a potentiometer.):
iC-NZN
N-TYPE LASER DIODE DRIVER
y inar im prel
Rev A1, Page 8/16 lead to an unstable control circuit under certain conditions such as inadequate PCB layout or laser diodes with very low monitor current. In these cases, an optional capacitor can be connected as close as possible to the chip, across pin CI and CIS. This will prevent instability of the control circuit. For averaging control a 10 nF capacitor at CI is recommended. Special care must be taken in PCB layout when laying out the path from the laser diode's cathode via pin LDK to AGND. This path must be kept as short as possible to avoid parasitic inductances. A small 300 pF capacitor across the laser diode helps to compensate for these parasitic inductances.
V (MD) 0.5 V RMON = = = 33.34 k IM 15 A External capacitor mode In applications where an external capacitor is required (see best performance recommendations below), the external capacitor mode must be enabled (pin CID = high). This connects the capacitor to the control circuit and additionally enables a pull-down current at pin CI to prevent this capacitor from being charged due to residual currents (cf. Electrical Characteristics No. 406). Best performance recommendations The operating point for the laser diode is stored in an on-chip capacitor. This permits a fast start-up but can N-type diodes
Figures 3, 4 and 5 show the typical set-up for the different N, P and M-type diode configurations.
RVDD
+3..+5.5V
VDD i(RSI)x540 LDA MONITOR
LDA
CVDD
100 nF.. RSI 0.68.. 9k
RSI NSLP
VDD
iC-NZN
& 1
CLDA
IMON LDK
N ..300mA
100 nF..
REGE
AVG VSY SYN EP EN
VDD
& REF LVDS/TTL + -
+
x240
CI
ECI
CI
CIS
..10 nF..
TTL CID INPUT INTERFACE NERR OverTemp. 1 OverCurrent Low V(LDA) Bandgap, Reference, Overtemp OUTPUT MONITOR T.PAD GND ECI OUTPUT DRIVER
AGND MD
RMD
GND
PMD
RGND
Figure 3: Circuit example for N-type laser diodes P-type diodes Althought this kind of laser diodes are supported by iCNZN, it's strongly recommended to use iC-NZP instead since in this configuration, all the pulses at LDK will be coupled directly to pin MD due to monitor diode's internal capacitance, thus making an accurate control much more difficult. Moreover, applications with P-type laser diode case grounded are possible with iC-NZP only.
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 9/16
RVDD
PMD
RMD
+3..+5.5V
VDD i(RSI)x540 LDA MONITOR
LDA
CVDD
100 nF.. RSI 0.68.. 9k
RSI NSLP
VDD
iC-NZN
& 1
CLDA
P
IMON LDK
100 nF.. ..300mA
REGE
AVG VSY SYN EP EN
VDD
& REF LVDS/TTL + -
+
x240
CI
ECI
CI
CIS
..10 nF..
TTL CID INPUT INTERFACE NERR OverTemp. 1 OverCurrent Low V(LDA) Bandgap, Reference, Overtemp OUTPUT MONITOR T.PAD GND ECI OUTPUT DRIVER
AGND MD
GND
RGND
Figure 4: Circuit example for P-type laser diodes. M-type diodes
RVDD
+3..+5.5V
VDD i(RSI)x540 LDA MONITOR
LDA
CVDD
100 nF.. RSI 0.68.. 9k
RSI NSLP
VDD
iC-NZN
& 1
CLDA
IMON LDK M
100 nF..
REGE
..300mA
AVG VSY SYN EP EN
VDD
& REF LVDS/TTL + -
+
x240
CI
ECI
CI
CIS
..10 nF..
TTL CID INPUT INTERFACE NERR OverTemp. 1 OverCurrent Low V(LDA) Bandgap, Reference, Overtemp OUTPUT MONITOR T.PAD GND ECI OUTPUT DRIVER
AGND MD
RMD
GND
PMD
RGND
Figure 5: Circuit example for M-type laser diodes Althought this type of laser diode are supported by iCNZN, it's strongly recommended to use iC-NZP instead since in this configuration, all the pulses at LDK will be coupled directly to pin MD due to monitor diode's internal capacitance, thus making an accurate control much more difficult. Moreover, applications with Mtype laser diode case grounded are possible with iCNZP only.
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 10/16
LASER CURRENT LIMITATION LDA current limitation iC-NZN monitors the average laser current flowing from pin LDA (Figure 6). The DC current limit is set by means of a resistor at pin RSI. When dimensioning resistor RSI the following applies (cf. Electrical Characteristics No. 106): Imax (LDA) = 540 x
NSLP
RSI @ VDD VDD LDA
CVDD
100 nF.. RSI
RSI
CLDA
i(RSI)x540 0.5V VDD-0.5V
100 nF..
0.68..9 k
0.5 V RSI
-
+
The current limitation can be disabled by connecting pin RSI to VDD.
Overcurrent
NERR
1
OverTemp.
Short pulses at LDA with higher currents are possible as only the DC current is monitored and capacitor CLDA supplies the current for short pulses. LDK current limitation The control circuit also monitors the laser current in pin LDK and limits this current when reaching the threshold also defined by RSI. The following applies (cf. Electrical Characteristics No. 107): 0.5 V RSI
Figure 6: iC-NZN LDA current limitation
iC-NZN features two different current limitations, limiting the average current flowing from pin LDA plus the current flowing into pin LDK.
Imax (LDK ) = 520 x
BURST MODE In controlled burst mode iC-NZN can pulse with up to 155 MHz. Controlled here means that a pre-set operating point is maintained during the burst phase. Therefore an operating point is settled first, for which pin REGE has to be high and the laser diode must be switched on. Once the operating point has been reached the laser diode can be switched off again. The operating point is stored in an on-chip capacitor and when pin REGE is set to low, the burst mode is activated. The pre-set operating point is maintained. For a longer burst mode, an external capacitor can be connected to pin CI. To prevent the laser current from rising due to residual currents, the capacitor is discharged then with a maximum of 150 nA (cf. Electrical Characteristics No. 406). As the capacitor is discharged gradually, the output level must be re-settled again after a certain period, depending on the admissible degradation of the laser output power.
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 11/16
CURRENT CONTROL The iC-NZN also supports laser current control, when no monitor diode is present. For that purpose, a fraction of the current flowing trough the laser diode is provided at IMON pin (ILDK / 240, cf. Electrical Characteristics No. 407). Tables 7 and 8 show how to set the inputs for laser control depending on the input interface selected (TTL or LVDS).
Laser control in TTL mode (TTL = high/open) EP EN NSLP REGE SYN Mode low/open Power save mode low/open open high low LDA charged, laser off high open high high/open high LDA charged, laser on, regulated high open high low high LDA charged, laser on, burst mode Table 7: Laser control in TTL mode Laser control in LVDS mode (TTL = Low) EP EN NSLP REGE SYN Mode low/open Power save mode < EN > EP high low LDA charged, laser off > EN < EP high high/open high LDA charged, laser on, regulated > EN < EP high low high LDA charged, laser on, burst mode Table 8: Laser control in LVDS mode The laser current is set by means of resistor RMON (= RMD + PMD). Figure 7 shows the typical set-up for current control.
Control modes Averaging Operation mode AVG = 0 AVG = 1 Averaging control
RMON calculation RMON =
V (RVDD)-V (MD) IM V (RVDD)-V (MD) IMxD
Peak current control RMON =
Table 9: Current control set-up External capacitor mode In applications where an external capacitor is required (see best performance recommendations below), the external capacitor mode must be enabled (pin CID = high). This connects the capacitor to the control circuit and additionally enables a pull-down current at pin CI to prevent this capacitor from being charged due to residual currents (cf. Electrical Characteristics No. 406). Best performance recommendations The operating point for the laser diode is stored in an on-chip capacitor. This permits a fast start-up but can make the regulated system unstable under certain conditions such as inadequate PCB layout. In these cases, an optional capacitor can be connected as close as possible to the chip, across pins CI and CIS. For averaging control a 10 nF capacitor at pin CI is recommended. Special care must be taken in PCB layout when laying out the path from the laser diode's cathode via pin LDK to AGND. This path must be kept as short as possible to avoid parasitic inductances. A snubber network across the laser diode also helps to compensate for these parasitic inductances.
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 12/16
RVDD
PMD RMD
+3..+5.5V
VDD i(RSI)x540 LDA MONITOR
LDA
CVDD
100 nF.. RSI 0.68.. 9k
RSI NSLP
VDD
iC-NZN
& 1
CLDA
IMON LDK
100 nF..
REGE
..300mA
AVG VSY SYN EP EN
VDD
& REF LVDS/TTL + -
+
x240
CI
ECI
CI
CIS
..10 nF..
TTL CID INPUT INTERFACE NERR OverTemp. 1 OverCurrent Low V(LDA) Bandgap, Reference, Overtemp OUTPUT MONITOR T.PAD GND ECI OUTPUT DRIVER
AGND MD
GND
Figure 7: Example set-up for current control
BLUE LASER DIODES With the iC-NZN also blue laser diodes can be driven. Due to the high forward voltage of these laser diodes, an appropriate supply voltage must be provided. The current limitation at pin LDA cannot be used then, since only pin LDK is capable of handling the higher voltage
..12V
required for the blue laser diodes. Nevertheless, the current limitation protection in pin LKD (cf. Electrical Characteristics No. 107) is still active. Figure 8 shows a typical set-up for blue laser diodes with APC and figure 9 with ACC.
CL
RVDD
100 nF..
M
+3..+5.5V
VDD i(RSI)x540 LDA MONITOR
LDA
CVDD
100 nF.. RSI 0.68.. 9k
RSI NSLP
VDD
iC-NZN
& 1
IMON LDK
REGE
..300mA
AVG VSY SYN EP EN
VDD
& REF LVDS/TTL + -
+
x240
CI
ECI
CI
CIS
..10 nF..
TTL CID INPUT INTERFACE NERR OverTemp. 1 OverCurrent Low V(LDA) Bandgap, Reference, Overtemp OUTPUT MONITOR T.PAD GND ECI OUTPUT DRIVER
AGND MD
RMD
GND
PMD
RGND
Figure 8: Set-up for blue laser diodes with APC
iC-NZN
N-TYPE LASER DIODE DRIVER
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Rev A1, Page 13/16
CL
RVDD
..12V
PMD RMD
100 nF..
+3..+5.5V
VDD i(RSI)x540 LDA MONITOR
LDA
CVDD
100 nF.. RSI 0.68.. 9k
RSI NSLP
VDD
iC-NZN
& 1
IMON LDK
REGE
..300mA
AVG VSY SYN EP EN
VDD
& REF LVDS/TTL + -
+
x240
CI
ECI
CI
CIS
..10 nF..
TTL CID INPUT INTERFACE NERR OverTemp. 1 OverCurrent Low V(LDA) Bandgap, Reference, Overtemp OUTPUT MONITOR T.PAD GND ECI OUTPUT DRIVER
AGND MD
GND
RGND
Figure 9: Set-up for blue laser diodes with ACC
SLEEP MODE The iC-NZN has a very low consumption sleep mode, e.g. for battery powered applications. With pin NSLP set to low the chip enters the sleep mode and disconnects pin LDA from the supply. The wake-up time from this sleep mode is about 300 s.
iC-NZN
EVALUATION BOARD
J1-V5D 6
LDAMDC
VDD
1
P LDC
3
J1-GND 1 U1 iC-NZN RVDD 12 1 VDD 19 RSI
LDA MONITOR i(RSI)x540 LDA 17
J1-GND1 2 2 JP3 2
LDA LDA
C1 100nF (default) 1
N
LDC MDA LDC MDA
C2 opt
R3 1k
JP5 VSY
JP4 ILIM OFF
JP6 Cext
JP7 ON
JP8 AVG
J1-GND2 4
D3 RD
R2 2.74k
LDA
J1-GND3 5 IMON IMON 4
VDD
iC-NZN
R7 opt D1
M D2
N-TYPE LASER DIODE DRIVER
J1-GND4 8 20 REGE
& 1
NSLP LDK 13 1 3 2 3
& REF x240
22 NSLP C8 opt
C3 100nF
C4 opt LDK GND
REGE 2 AVG 9 VSY CI 16 C5 10nF
+ VDD
J1-GND5 10
J1-GND6 12 CI C6 opt CIS JP2 1 2 3 (default) ACC APC 10 SYN 6 EP CIS 15
AGND 14 MD 3 LVDS/TTL
AVG
VSY
J1-TTL 3
3
SYN
2 7 EN 8 TTL 5 CID
INPUT INTERFACE OUTPUT DRIVER
EP
C7 100nF
JP12 J1-LVDS_P 9
1
EN
R4 opt
3
TTL
MD
JP11 R1 5.1K R5 opt
Bandgap, Reference, Overtemp OUTPUT MONITOR RGND 11
2
J1-LVDS_N 11 23 NERR
1 Low V(LDA) OverTemp. OverCurrent
1
CID
NERR C
R 10K P1 L
R6 opt
GND2 21 GND SUB EPAD
JP9 BURST
JP10 LVDS
GND
JP1 1 N-Type M-Type (default)
2
3 P-Type ACC
iC-NZN comes with an evaluation board for test purpose. Figures 10 and 11 show both the schematic and the component side of the evaluation board.
Figure 10: Schematic of the evaluation board
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iC-NZN
N-TYPE LASER DIODE DRIVER
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Figure 11: Evaluation board (component side)
iC-Haus expressly reserves the right to change its products and/or specifications. An Infoletter gives details as to any amendments and additions made to the relevant current specifications on our internet website www.ichaus.de/infoletter; this letter is generated automatically and shall be sent to registered users by email. Copying - even as an excerpt - is only permitted with iC-Haus approval in writing and precise reference to source. iC-Haus does not warrant the accuracy, completeness or timeliness of the specification on this site and does not assume liability for any errors or omissions in the materials. The data specified is intended solely for the purpose of product description. No representations or warranties, either express or implied, of merchantability, fitness for a particular purpose or of any other nature are made hereunder with respect to information/specification or the products to which information refers and no guarantee with respect to compliance to the intended use is given. In particular, this also applies to the stated possible applications or areas of applications of the product. iC-Haus conveys no patent, copyright, mask work right or other trade mark right to this product. iC-Haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. As a general rule our developments, IPs, principle circuitry and range of Integrated Circuits are suitable and specifically designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. In principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the Bureau of Statistics in Wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in Hanover (Hannover-Messe). We understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. Our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to.
iC-NZN
N-TYPE LASER DIODE DRIVER
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ORDERING INFORMATION
Type iC-NZN
Package QFN24 4 mm x 4 mm Evaluation Board
Order Designation iC-NZN QFN24 iC-NZN EVAl NZN1D
For technical support, information about prices and terms of delivery please contact: iC-Haus GmbH Am Kuemmerling 18 D-55294 Bodenheim GERMANY Tel.: +49 (61 35) 92 92-0 Fax: +49 (61 35) 92 92-192 Web: http://www.ichaus.com E-Mail: sales@ichaus.com
Appointed local distributors: http://www.ichaus.com/sales_partners

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