View LX1994_665636.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
DESCRIPTION
KEY FEATURES Efficiency > 92% Dual PFM Architecture To Extend Battery Life VIN Range 2.0V To 5.5V. Start Up Warranty @ 2.0V Logic Control Shutdown 100A Typical Quiescent Current Shutdown IQ Current <1A OVP For Open String Output Voltage Low Voltage And Offset Current Sense Light Sensor (LX1970) interface Dual Dimming Options (PWM or DC Voltage) No External Zener Clamp Diode 10-Pin MLP or MSOP
APPLICATIONS
Microsemi's LX1994 is a compact, high efficiency, step-up boost controller which is designed to drive a string of white or colored LED's in a backlight or front light system. The LX1994 design is based on a dual mode PFM architecture and provides maximum typical efficiency greater than 92%. The LX1994 has many unique design features and advantages over competitor solutions. The features included: low quiescent current (100A typical), low shut down current (<1A), dedicate ambient light sensor interface (LX1970), dual dimming modes, low voltage and low offset current sense, and integrated OVP protection. The converter achieves high efficiency, low cost, and flexible design by selection of an external NChannel MOSFET, current sense resistors, and integrated OVP protection.
The use of external N-channel MOSFET allows design to optimize system efficiency. The OVP protection comparator eliminates the need of an external Zener diode clamp. The OVP function can be scaled for any output voltage. Maximum output current is achievable by selection of the current sense resistor. These features make the controller ideal for PDA or digital camera applications To enhance system battery life, the LX1994 provides 2 dimming options and a dedicated ambient light sensor (LX1970) interface. The LX1994 supports a wide range of system battery voltage inputs which ranges from 2.0 to 5.5V. The LX1994 is guaranteed to start up at 2.0V input. The LX1994 is available in miniature 10-pin MLP or MSOP packages.
WWW .Microsemi .C OM
IMPORTANT: For the most current data, consult MICROSEMI's website: http://www.microsemi.com
Pagers PDA Cell Phone Portable Display Digital Cameras
PRODUCT HIGHLIGHT
33H VIN = 2.0V to 5.5V UPS5819
Auto Adjust for Ambient Light
3V VDD VSS SNK SRC
VIN S/P
LX1994
FDV303
DRV SRC OVP FB
BRT LS GND
LX1970
CMP
LX1994 LX1994
PACKAGE ORDER INFO
TA (C) -40 to 85
LD
Plastic MLP 10-Pin LX1994CLD
DU
Plastic MSOP 10-Pin LX1994CDU
Note: Available in Tape & Reel. Append the letters "TR" to the part number. (i.e. LX1994CDU-TR)
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN OUT
WWW .Microsemi .C OM
Supply Input Voltage (IN) ...................................................................-0.3V to 7V All Input Pins ......................................................................................-0.3V to VIN SRC Input Current ......................................................................................600mA Operating Temperature Range .........................................................-40C to 85C Maximum Operating Junction Temperature ................................................ 150C Storage Temperature Range...........................................................-65C to 150C Lead Temperature (Soldering 10 seconds) .................................................. 235C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to Ground. Currents are positive into, negative out of specified terminal.
VIN S/P BRT LS GND
1 2 3 4 5
10 9 8 7 6
DRV SRC OVP FB CMP
DU PACKAGE
(Top View)
THERMAL DATA
VIN S/P
1
10
DRV SRC OVP FB CMP
2
9
DU LD
Plastic MSOP 10-Pin 113C/W
BRT LS GND
3
8
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
4
Connect Bottom to Power GND
7
5
6
Plastic MLP 10-Pin 49C/W
LD PACKAGE
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
FUNCTIONAL PIN DESCRIPTION Name IN GND BRT FB SRC DRV OVP LS CMP S/P Description Unregulated IC Supply Voltage Input - Input range from 2.0V to 5.5V. Bypass with a 1F or greater capacitor for operation below 2.0V. Common terminal for ground reference. LED Current Adjustment - Accepts a DC analog input. LED Current Sense - Connect to current sense resistor. MOSFET Current Sense Input - Connects to the external N-Channel MOSFET source. MOSFET Gate Driver - Connects to an external N-Channel MOSFET gate. Over Voltage Programming Pin - Connects to a resistor divider between the output load and GND to set the maximum output voltage. Light Sensor Input - Allows light sensor current input to be modulated by the PWM control causing LED brightness to be a product of the PWM duty cycle and ambient light level. Compensation Pin - Apply a 0.1F capacitor for loop compensation. Shutdown/PWM Pin - A logic low longer than 100s causes the IC to enter Shutdown mode. Applying a PWM signal to this pin and a filter capacitor to the BRT pin allows amplitude independent PWM control.
PACKAGE DATA PACKAGE DATA
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
ELECTRICAL CHARACTERISTICS Unless otherwise specified, the following specifications apply over the operating ambient temperature -40C TA otherwise noted and the following test conditions: VIN = 3.6V, ILOAD = 20mA
85C except where
WWW .Microsemi .C OM
Parameter
Operating Voltage Minimum Start-up Voltage Start-up Voltage Temperature Coefficient Quiescent Current BRT Full scale bias current BRT Light sensor current S/P Logic Low Voltage S/P Logic High Voltage S/P Input DC Bias Current S/P PWM frequency S/P Pulse Width BRT PWM Voltage BRT PWM Voltage Feedback Comparator Offset SCR peak current Efficiency DRV Sink/Source Current Maximum Switch On-Time Minimum Switch Off-Time OVP Threshold Voltage OVP Input Bias Current
Symbol
VIN TA = +25C
Test Conditions
Min
2.0
LX1994 Typ Max
5.5 2.0 -2 100 200 1 13.5 0.6 0.35 10.5 110
Units
V V mV/C A A A A V V A KHz ns mV mV mV mA % mA s ns V nA
For Reference Only IQ IBRT IBRT VS/P VS/P SHDN = VIN, No external FET SHDN = GND S/P = VIN, VBRT = GND, ILS = 0A S/P = VIN, VBRT = GND, ILS = 100A 1.4 -1 10 50 270 7.5
S/P = VIN
0.05
1 1000 330
VBRT VBRT VOS IPK tON tOFF VOVP IOVP
VS/P = VIN (DCS/P = 100%) DCS/P = 50%, FPWM = 100KHZ VFB - VBRT, VBRT = 0mV HYST mode; TA = +25C VOUT = 18V, ILOAD = 20mA, VIN = 5.0V
180 140 10 240 1.10 -50
300 150 4 240 92 200 15 350 1.22
300
VOVP = 1V
20 460 1.34 50
ELECTRICALS ELECTRICALS
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
SIMPLIFIED BLOCK DIAGRAM
WWW .Microsemi .C OM
1.2V
O VP
CSM HYST B U RS T CSM I PEAK S W ITCH LO G IC D R IV E
200m V
DRV
I PEAK 100m V x10
SRC
0.2
K J/K LA TC H C LE A R 16 B IT S H IFT RE G IS TE R CLO C K OUT J Q CSM
GND
I PEAK
0.6V
CMP
100K
FB
10uA
LS S /P
30k
3m V
BR T
E ELECTRICALS
PWM & S H UTD O W N D ETEC TIO N
S LEE P MODE CO N TR O L
RE F
V IN
Figure 1 - Simplified Block Diagram
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
THEORY OF OPERATION
Basic PFM operation The LX1994 dual mode PFM modulator is implemented in two switching modes: the hysteretic and Continuous Switching Mode (CSM). In hysteretic switching mode, the basic PFM modulator logic/timing block uses a Fixed Peak Current/ Fixed Off Time where the switch turns on and allows the inductor current to ramp to a finite peak level then shuts off for a fixed duration of time. The basic modulation cycle repeats as long as the converter output voltage is less than the maximum regulation level. When the maximum regulation level is reached, the switch remains off until the output voltage capacitor discharges to a level less than the minimum regulation level. The input signals to the switch logic block are the burst on/off control signal and the peak current detection signals. For low and negligible switch conduction losses the designer may set the peak current comparator at 20mV corresponding to 200mA of output current. In Continuous Switching Mode (CSM), the level to the peak current comparator is variable. This current level is developed by integrating the output of the feedback comparator which functions as a high gain bandwidth limited error amplifier. This current is clamped to the peak switch current limit of 600mA. The integrated capacitor is attached at the CMP pin when the burst on/off control line is forced to the "ON" state. The conversion from hysteretic to CSM mode is performed when the burst length exceeds more than 16 switching cycles counting by an internal 16 bits shift register. The internal register is clocked by the switch transitions during each burst period. When the switching cycles exceed 16 cycles, the converter automatically switches over to CSM mode. CSM mode switching is latched by a J/K flip-flop. The conversion from CSM mode to hysteretic mode is performed when the error amplifier output falls below 10mV (corresponding to 100mA peak current) as determined by a comparator. This resets the J/K flip-flop and converts back to hysteric mode.
The LX1994 is a highly efficient PFM boost converter, its design is based on dual mode PFM for driving a series of white or color LEDs. The advantage of PFM switching is to minimize system efficiency losses in both heavy and light load operations. The LX1994 does not require an external oscillator due to PFM dual modes switching. In light load operation, the converter minimizes switching losses by delivering more energy than necessary during switching burst period than the inactivity coast period. In heavy load condition, the converter uses the Continuous Switching Current Mode (CSM) regulation scheme. This minimized peak switching current and thereby minimizes the conduction losses. Losses There are two types of losses in PFM regulator design: the switching loss, and conduction loss; that contribute to system inefficiency. Switching loss: Energy switching losses are associated with a NFET's switch changing state (from on to off or vice versa) as a simultaneous high level of voltage and current are at the NFET's switch during the transition. This switching loss is proportional to the switching frequency. Conduction loss: the loss due to current flow in the series resistance of the switch, inductor, and current sense resistor. Conduction loss is proportional to the square of the switch current. Output Current Selection The LED output current is regulated by adjusting of the FB pin voltage. If the FB pin voltage equals the BRT pin voltage, the LED current is the result of the FB pin voltage divided by the selected current sense resistor. For example: in a 100% duty cycle design, FB pin voltage is 300mV, the current sense resistor is 15. The LED current equals:
300mV 15 = 20mA
WWW .Microsemi .C OM
APPLICATIONS APPLICATIONS
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
THEORY OF OPERATION (CONTINUED)
Dimming Modes Microsemi's LX1994 provides two dimming options: PWM or DC voltage input. PWM dimming A PWM signal applied to S/P pin (see figure 4). This PWM signal is scaled to the reference such that a N% duty cycle PWM signal will produce an LED current of
{N% * (10A+ILS) * RBRT}
RFB
If a light sensor (such as Microsemi's LX1970) is used, the light sensor current is applied to the LS pin and adds to the 10A internal current source; in this case the internal current source determines the adjustment range in a pitch black ambient. The PWM signal will scale the light sensor signal allowing the dimming range to increase as the ambient light increases. DC dimming mode In "DC dimming mode" (see figure 5) the BRT pin input voltage can be applied directly to BRT pin with the S/P pin pulled high or developed indirectly by applying a PWM signal to the S/P pin and using a scaling resistor and filter capacitor at the BRT pin. The internal current source produces a 10A reference current that is scaled by the resistance applied to the BRT pin.
Protection and IC Shutdown OVP: The LX1994 provides OVP protections. If the voltage at the OVP pin exceeds the internal reference voltage (1.2V), the converter will suspend switching. The converter will attempt to regulate the OVP pin to its nominal 1.2V. IC Shutdown: To force the IC into shutdown mode, the S/P pin must pull low for a duration longer 100s. In shutdown mode, the switch is off and the LED string current typically reduces to a few nano amps of leakage current.
WWW .Microsemi .C OM
A APPLICATIONS
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 6
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
6 LED EFFICIENCY (3.7V INPUT)
100 90 EFFICIENCY 80 70 60 50 0 5 10 15 20 25 LED CURRENT
EFFICIENCY
14 LED EFFICIENCY (3.7V INPUT)
WWW .Microsemi .C OM
100
90
80
70
60
50 0 5 10 15 20 25 LED CURRENT
HYSTERETIC MODE WAVEFORMS
CONTINUOUS MODE WAVEFORMS
blue = sense voltage Green = inductor current
blue = sense voltage Green = inductor current
C CHARTS
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 7
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
WWW .Microsemi .C OM
33uH VIN = 2.0 to 5.5V
UPS5819
LX1994
VIN PWM S/P BRT R4 2.94k FB C2 1uF LS GND CMP DRV SRC OVP
FDV303 R6 1M
R1 28.7k AUTO R2 226k
R7 30k 0.1uF
R5 15
VDD
SNK R3 23.2k
VSS
SRC C1 22uF MAX
AUTO MODE RESPONSE
100% DUTY
LX1970
80% DUTY LED CURRENT 60% DUTY 40% DUTY 20% DUTY 0% DUTY AMBIENT LIGHT
Figure 2 -PWM Dimming applied to S/P Input and Light Sensor (Dimming option 1)
Vcc
1M 110k +
BSS123 VIN = 2.0 to 5.5V
33uH
UPS5819
LX1994
VIN DRV SRC OVP BRT R4 2.94k FB C2 1uF LS GND CMP S/P
FDV303 R6 1M
PWM
R1 28.7k AUTO R2 226k
R7 30k 0.1uF
R5 15
VDD
SNK R3 4.99k
VSS
SRC C1 100uF
AUTO MODE RESPONSE
LX1970
APPLICATIONS APPLICATIONS
MAX
100% DUTY 80% DUTY 60% DUTY
LED CURRENT
40% DUTY
20% DUTY
0% DUTY AMBIENT LIGHT
Figure 3 -PWM Dimming applied to S/P Input and Light Sensor (Dimming option 2)
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 8
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
APPLICATION CIRCUITS
WWW .Microsemi .C OM
33uH VIN = 2.0V to 5.5V
UPS5819
LX1994
VIN PWM dimming S/P BRT CMP 0.1uF LS GND FB 0.1uF SRC OVP DRV
FDV303 1M
51k
15
Figure 4 - LED Driver with PWM Dimming applied to S/P Input
33uH VIN = 2.0V to 5.5V UPS5819
LX1994
VIN ON OFF DIMMING BRT FB LS CMP GND S/P DRV SRC OVP
FDV303 1M
51k 0.1uF
15
Figure 5 - LED Driver with DC Dimming applied to BRT Input
Note:
The component values shown are only examples for a working system. Actual values will vary greatly depending on desired parameters, efficiency, and layout constraints.
APPLICATIONS APPLICATIONS
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 9
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
APPLICATION INFORMATION
WWW .Microsemi .C OM
OVP PROGRAMMING Resistors R6 and R7 of Figure 2 program the over voltage clamp level. The value of R6 can be as high (like 1M.) to minimize the quiescent current. The value of R7 can be determined using the following equation where VOVP is found in the ELECTRICAL CHARACTERISTICS TABLE:
R7=R6x
LIGHT SENSOR INTERFACE
The LX1994 has a LS input pin to simplify the interface to an LX1970 light sensor. Two different circuits are described which provide slightly different response curves. The equations for calculating the component values are also given. For the circuit of Figure 2, the describing equations are:
R4= Rpx30k Rp+30k
VOVP VOUT -VOVP
or G4=Gp-
1 30k
DESIGN EXAMPLE: Let R6 equal 1M and the required clamp voltage is 25V.
R7 = 1M xR
Auto Mode:
1.2 25-1.2
= 50.4
INDUCTOR AND CAPACITOR SELECTION The output filter inductor should be a 1F capacitor with sufficient voltage rating for the OVP setting. Inductors in the range of 10H to 47H work best. For the best efficiency a larger value of inductor such as 47H is recommended; larger value inductors will reduce ripple current which reduces peak currents and improves efficiency. Smaller value inductors may be use less board space, so a design trade off is in order. TRANSISTOR AND DIODE SELECTION A Schottky diode should be used with a 1 Amp current rating and voltage rating equivalent to the OVP setting. The transistor should be a N-channel MOSFET with a logic level gate voltage: good candidates are the FDV303N and the FDN337. For higher voltages, several BSS138 can be wired in parallel. LAYOUT GUIDELINES The LX1994 requires a tight layout of the CMP pin capacitance. For best results, the 0.1F CMP capacitor should be located directly adjacent to the LX1994 package with etch lengths as short as possible.
VIN S/P BRT LS GND
1 2 3 4 5 10 9 8 7 6
( ISRC +10A ) x ( R1xR2xRp ) DutyCycle ( R1xR2 ) + ( R1xRp ) + ( R2xRp ) I LED = x R5 VCC x ( R1xRp ) + ( R1xR2 ) + ( R1xRp ) + ( R2xRp )
ISRC(MAX) = VCC -VCOMPLIANCE -VBRT(MAX) R3
Manual Mode:
10Ax ( R1xR2xRp ) DutyCycle ( R1xR2 ) + ( R1xRp ) + ( R2xRp ) I LED = x R5 VCC x ( R2xRp ) + ( R1xR2 ) + ( R1xRp ) + ( R2xRp )
Example: Select R5 = 15 ohms; ILED = 20mA max; ISRC clamp at 100A; VCC = 3.3; ILED in full darkness and 100% duty cycle = 4mA. With R5 = 15 ohms; ILED = 20mA max, VBRT(MAX) = 300mV. With ISRC clamp at 100A, Vcompliance (LX1970) = 0.68V, VCC = 3.3V, so
R3=
APPLICATIONS APPLICATIONS
DRV SRC OVP FB CMP
(3.3-0.68-0.3) =23.2k
100A
0.1uF
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 10
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
APPLICATION INFORMATION
WWW .Microsemi .C OM
R3 = 23.2k The level at 100% duty cycle in full darkness is 4mA, which is 20% of the maximum level of 20mA; this implies 80% is attributable to ISCR. Combining this information with the describing equation for AUTO mode gives:
80%xI LED(MAX) xR5= ISRC x R1xR2xRp
The equations above can be solved for G1, G2 and Gp:
G1=34.8x10 G2=4.45x10
Gp=376x10
-6 -6
-6
(
)
Knowing Gp we can find
G4=Gp1 30k =343x10
-6
( R1xR2) + ( R1xRp ) + ( R2xRp )
This implies:
( R1xR2xRp ) 0.8x.02x15 = =2.4k ( R1xR2 ) + ( R1xRp ) + ( R2xRp ) 100A
Since the left side is the three resistors in parallel, this can be restated as:
416x10 =
-6
The resistance values conductance's so:
R1 = 28.7k R2 = 225k R4 = 2.91k
are
the
reciprocal
of
the
1 R1
+
1 R2
+
1 Rp
=G1+G2+Gp
The value of C1 is selected to give a time constant of 1/2 second and works into R3 (which is 23.2k).
C1= 0.5 23.2k
The manual mode equation can be reduced to this assuming 100% duty and 20mA LED current (that is 0.3V sense resistor voltage):
R2xRp R2+Rp = 0.3xR1 (10AxR1)+VCC -0.3 10 R1 = 0.3xR1 (10AxR1)+3.0
C1 = 21.5F
The value of C2 works into Rp and the pole should be set at 1/100 of the PWM frequency.
C2= 6.28x 1 10kHz 100 x2.66k
This can be restated as:
1 R2 + 1 Rp =33x10 +
-6
or G2+Gp=33x10 + (10xG1)
-6
For a 10KHz PWM, C2 = 599nF, and a value of 1f works well. Circuit of Figure 3: The second light sensor interface is very similar to the first; the choice is a matter of user preference. In the second circuit, an active 325mV clamp is used to clamp the maximum LED current in auto mode. In this circuit, resistor R3 is reduced to extend the operating ambient light range of the light sensor and filter capacitor C1 must therefore be increased.
The auto mode equation can be reduced to this assuming 100% duty , 100A ISRC current and 20mA LED current (that is 0.3V sense resistor voltage):
R1xRp R1+Rp = = 0.3xR2
( (ISRC +10A)xR2 ) +VCC -0.3
0.3xR2 = 0.3xR2
( (100+10A)xR2) +VCC -0.3 (110AxR2 ) +3.0
+ 1 Rp =367x10 +
-6
APPLICATIONS APPLICATIONS
This can be restated as:
1 R1 10 R2
or G1+Gp=367x10 + (10xG2 )
-6
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
PACKAGE DIMENSIONS
WWW .Microsemi .C OM
DU
10-Pin Miniature Shrink Outline Package (MSOP)
D
E1
S
e E A c L L1
Dim A A1 b c D e E E1 L L1 S
A1
b
MILLIMETERS MIN MAX - 1.10 0.05 0.15 0.15 0.30 0.13 0.23 2.90 3.10 0.50 BSC 4.75 5.05 2.90 3.10 0.41 0.70 0.95 BSC 0.50 BSC 0 6
INCHES MIN MAX - 0.043 0.002 0.006 0.006 0.012 0.005 0.009 0.114 0.122 0.020 BSC 0.187 0.198 0.114 0.122 0.016 0.028 0.037 BSC 0.020 0 6
LD
10-Pin Plastic Micro Lead frame Package (MLP)
D e Pin1 ID L
1 2 3 4 5
E
E2
10
9
8
7
6
Top View
b D2
Bottom View
A A3 A1
Dim A A1 A3 b D D2 e E E2 L
MILLIMETERS MIN MAX 0.80 1.00 0 0.05 0.20 REF 0.18 0.30 3.00 BSC 2.23 2.48 0.50 BSC 3.00 BSC 1.49 1.74 0.30 0.50
INCHES MIN MAX 0.0315 0.0394 0 0.0019 0.0079 REF 0.0071 0.0118 0.1181 BSC 0.0878 0.0976 0.0197 BSC 0.1181 BSC 0.0587 0.0685 0.0071 0.0197
MECHANICALS MECHANICALS
Note:
Dimensions do not include mold flash or protrusions; these shall not exceed 0.155mm(.006") on any side.
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 12
LX1994
TM (R)
High Efficiency LED Driver
PRODUCTION DATA SHEET
NOTES
WWW .Microsemi .C OM
N NOTES
PRODUCTION DATA - Information contained in this document is proprietary to Microsemi and is current as of publication date. This document may not be modified in any way without the express written consent of Microsemi. Product processing does not necessarily include testing of all parameters. Microsemi reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright (c) 2003 Rev. 1.0a, 2004-08-10
Microsemi
Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 13

▲Up To Search▲

Price & Availability of LX1994

	To Download LX1994 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .