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LED Driver Series for LCD Backlight
Simple Structure Constant Current Backlight Driver for LCD panels (Non-step type)
BD9206EFV
No.09040EAT03
Description BD9206EFV is an IC with a built-in 6ch high-accuracy (absolute accuracy:4%) constant-current driver. Capable of lighting a maximum of 36 white LEDs with 6 rowsx6 lines. Due to the wide input voltage range (8V~30V), it can be widely used from a backlights of Note PC and PDA etc. to LED light sources of Scanner and PPC etc. Moreover, it restrain the generation of heat at the time of large current drive because of adoption of high-heat-radiation package(HTSSOP-B20). Features 1) A wide input voltage range8V30V 2) Capable of driving a maximum of 36 white LEDs of 6 seriesx6 parallel 3) Value of constant current is set by the VSET terminal 4) Due to the STBY terminal, the consumption current at the time of standby is low 5) PWM dimming is possible due to the clock input to the EN terminal 6) Built-in 5V regulator 7) High-heat-radiation package of HTSSOP-B20 6.4x6.5x0.85mm
Applications For use in LED light source of PPC and Scanner etc., LED lighting fixture, and LCD backlight lights of monitor and note PC etc. Absolute maximum ratingsTa25 Item Symbol Rating Unit Power Supply Voltage Vcc 36 V VLED 28 V LED output voltage Power Dissipation Pd 3.2 *1 W Topr -40+85 Operational Temperature Range Storage Temperature Range Tstg -55+150 ILED 30 *2 mA LED Maximum Current *1 Reduce with 25.6mW at 1 if Ta= 25 or above at the time of mounting a base-plate of glass epoxy in 4 layer of 70mmx70mmx1.6mm. *2 It is value per LED driver 1ch. Please set inside the range which does not exceed the allowable loss value of the package.
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1/12
2009.07 - Rev.A
BD9206EFV
Recommended Operational conditionTa=25 Item Power Supply Voltage EN terminal clock input possible range VSET input possible range Applied voltage range for LED terminal Symbol Vcc VENCLK VSET VLED Rating 830 10010000 0.63 0.628 Unit V Hz V V
Technical Note
Electrical CharacteristicsUnless specified, Ta=25,Vcc=24V Ratings Item Whole Circuit electric current when OFF Circuit electric current when stand by Circuit electric current when operating LED Driver 1~6 Output current Leak electric current when OFF Influx electric current to VSET terminal VREG Output voltage Output current UVLO Detection voltage Hysteresis voltage STBY, EN, TEST Input Low level Input high level Input current VIL VIH RPD -0.3 2.0 33 47 0.8 Vcc 66 V V A Vin=3V VUVREG VUHYVREG 2.4 0.05 2.9 0.1 3.4 0.2 V V VREG fall down VREG rise up VREG IOMAX 4.7 10 5.0 30 5.3 V mA Io=1mA Vo=VREGx0.9 ILED ILEDLK IINVSET 19.2 20.0 0.0 -0.05 20.8 5.0 -0.10 mA A A VSET=2.0V, VLED=1V VLED=26V VSET=2V IOFF IST ICC 17 1.8 2.5 28 3.6 5.0 A mA mA STBY=L, EN=L, TEST=L STBY=H, EN=L, TEST=L STBY=H, EN=H, TEST=L Symbol Min. Typ. Max. Unit Conditions
It is not the radiation-proof design for this product.
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2/12
2009.07 - Rev.A
BD9206EFV
Block diagram Package outline drawing
Technical Note
VCC STBY
20
2 100k
PREREG REF 5V REG UVLO
5VREG Current Driver 5VREG 6 ENH1 100k 1
VREG
AGND
4
Vo LED1
EN
3
BD9206EFV
ISET1
PREREG 5VREG
TSD
5VREG
LED25
VSET
18
RSET
Driver Current Setting
6
ISET25 4
Lot No.
5VREG 15
LED6 PGND12
TEST
17 ISET6
HTSSOP-B20Unitmm Fig..1 Terminal placement diagram
VREG STBY EN AGND PGND1 LED1 LED2 LED3 N.C. N.C. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC N.C. VSET TEST PGND2 LED6 LED5 LED4 N.C. N.C.
Fig..2 Terminal explanation
Terminal number
Terminal name
VREG STBY EN AGND PGND1 LED1 LED2 LED3 N.C. N.C.
Function
Power supply for internal circuit Stand by terminal (Low:OFF,High:stand by, operation) LED116 Enable terminal(Active:High) GND for internal standard section POWER GND for LED driver Output terminal 1 for LED driver Output terminal 2 for LED driver Output terminal 3 for LED driver (Not yet connected terminal) (Not yet connected terminal)
Terminal number
Terminal name
N.C. N.C. LED4 LED5 LED6 PGND2 TEST VSET N.C. VCC
Function
(Not yet connected terminal) (Not yet connected terminal) Output terminal 4 for LED driver Output terminal 5 for LED driver Output terminal 6 for LED driver Power GNDPOWER GND for LED driver Terminal for test mode shift (Use at usual timeLow) Standard voltage terminal for fixed electric current setting (Not yet connected terminal) Terminal of power supply
1 2 3 4 5 6 7 8
11 12 13 14 15 16 17 18 19 20
Fig..3
9 10
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3/12
2009.07 - Rev.A
BD9206EFV
Reference data(Unless specified,VCC=24V, Ta=25)
0.05
Technical Note
3.0
5
0.04
STBY=L EN=L
2.5
STBY=H EN=L
4
STBY=H EN=H
ICC [mA]
0.03
2.0
3
ICC [mA]
0.02
1.5
ICC [mA]
2
1.0
0.01
1
0.5
0.00
0 0 4 8 12 16 20 24 28 32 36
0
4
8
12
VCC [V]
16
20
24
28
32
36
0.0 0 4 8 12 16 20 24 28 32 36
VCC [V]
Fig..4-1 Circuit electric current (at the time of OFF mode)
35 30 25 20
VCC [V]
Fig..4-2 Circuit electric current (at the time of stand by mode)
32 28 24 20
Fig..4-3 Circuit electric current (at the time of operating mode)
24
VSET=2V
23 22 21
VSET=2V
ILED [mA]
ILED [mA]
16 12 8 4 0
15 10 5 0 0 0.5 1 1.5 2 2.5 3 3.5
ILED [mA]
20 19 18 17
0
1
2
3
4
5
6
-40
-20
0
20
40
60
80
100
VSET [V]
VSET [V]
TEMP []
Fig..4-4 VSET Constant electric current Characteristics
10 9 8 7 6
Fig..4-5 VLED Dependency of ILED
5.5
Fig..4-6 Constant electric current temperature characteristic
8 7 6
Io=0mA
5.4 5.3 5.2 5.1
Io=0mA
5
VREG [V]
5 4 3 2 1 0 0 4 8 12 16 20 24 28 32 36
VREG [V]
5.0 4.9 4.8
VREG [V]
-40 -20 0 20 40 60 80 100
4 3 2
4.7 4.6 4.5 1 0 0 0.5 1 1.5 2 2.5 3
VCC [V]
TEMP []
VSTBY [V]
Fig..4-7 VREG_VCC characteristic
8 7 6 5
Fig..4-8 VREG temperature characteristic
Fig..4-9 STBY Threshold voltage
VRED [V]
4 3 2 1 0 0 0.5 1 1.5 2 2.5 3
VEN [V]
Fig..4-10 EN Threshold voltage
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4/12
2009.07 - Rev.A
BD9206EFV
Technical Note
Block functional descriptions PREREG, REF, 5VREG PREREG is an circuit of constant voltage supplied to REF and 5VREG in which the voltage applied to VCC terminal is made to be constant. REF is a temperature-compensated reference voltage resource and used as reference voltage of TSD (Thermal Shutdown Circuit). 5VREG is a 5V constant-voltage source and used as a power supply of constant-current driver. The 5V constant voltage is output to VREG terminal. Moreover, it is recommended to attach a 1F ceramic capacitor using for phase correction, to VREG terminal. UVLOUnder Voltage Lock Out The LED driver is turned OFF when the VREG voltage is less than 2.9V(typ). The operation of lighting up is reset when VREG becomes more than 3.0V(typ). TSDThermal Shutdown Circuit TSD circuit protects the IC from thermo runaway or thermal damage. TSD circuit detects the chip temperature and turns the circuit off if the chip temperature reaches 175. The hysteresis of 20 is set for TSD detection and release so as to prevent malfunction caused by temperature fluctuations. Current DriverConstant-current driver, Driver Current Setting Current Driver(Constant-current driver) is an circuit that generates a constant current for lighting of LED. Constant-current circuit of BD9206EFV consists of the constant current setting part and the constant current driver part. The constant-current driver part operates in such a manner that the voltage of Point a is equal to the voltage of point b because the part serves as a buffer, the input of which is the voltage VX that is set by the constant current setting part. Therefore, the current ILED that flows into the VLED terminal is as follows: ILED = Vb/RSET = Va/RSET = VX/RSET = VSET*A/RSET = VSET*B A and B are numerical constants For BD9206EFV, the numerical constants inside the IC are set in such a way that the following formula is brought into existence: ILED(mA) = VSET 10 (VSET=0.63.0V) If VSET is fixed, then the Vb is fixed, therefore the current ILED always flows independent of the fixed voltage of VLED. However, the constant current operation is stopped if the voltage of VLED terminal is less than 0.6V, so please ensure VLED>0.6V.
Vo
[Constant setting current part] [Constant current driver part] Condenser for phase compensation
IL E D
a VX =VS ET*A Voltage shift circuit VSET
VLED
+ b
VX
RSET EN
Fig..5
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5/12
2009.07 - Rev.A
BD9206EFV
Technical Note
Rise time and Fall time of LED Driver's constant current
In the state of STBY=H, the rise time of constant current at the time of EN=LH and the fall time at the time of EN=HL are as shown in the following table. As shown in Fig.5, the constant current driver is formed in such a way that the NMOS of the driver output is made to be operated or stopped by the EN signal. Therefore, the rise time for the second time or later is shorter than the one for the first time because the electrical charge of the capacitor for phase compensation is reopened from the charged state.
Remarks The time interval between the moment of EN=LH and the Rise time 2.9s 7% 2.6s 7% moment at which the ILED reaches 90% of the set value The time interval between the moment of EN=HL and the Fall time 0.7s 11% 0.7s 11% moment at which the ILED reaches 10% of the set value On the condition that VCC=Vo=24V, VFLED=3.2V 5-stage connection, RL=15 STBY, EN At the time of STBY=L, it becomes the OFF mode, then only a portion of the circuit inside the IC is operating, so the circuit current is restricted to 17A (typ). At the time of STBY=H, it becomes the Standby mode, then 5VREG is started and UVLO is released before the LED driver gets into the state of Ready. After that, if EN=LH, then the current flows into the LED driver and the LED is lighted up. Note: If STBY and EN are simultaneously made to be LH, then the rising edge of the LED driver gets late because the starting time of 5VREG is necessary. If it is used after PWM dimming, then please let STBY=H beforehand and input the CLK to EN before using. Operation logic of LED driver
EN
STBY
First time
Second time or later
L L H Stop Stop
H Stop Operation
STBY EN UVLO TSD
LED Driver active : High
Logic of LED driver protection circuit
Function UVLO TSD
Stop VREG < 2.9V(typ) Ta > 175
Operation VREG > 3.0V(typ) Ta < 155
TEST terminal TEST terminal is only used in ROHM's testing process before delivery, so please use the IC with the terminal fixed at Low in normal times.
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6/12
2009.07 - Rev.A
BD9206EFV
Timing
Technical Note
chart
VCC
VCC input. VSET Setting It moves to OFF mode due to STBY = L -> H. 5VREG (VREG) start. Rising time ms. It becomes UVLO = H depending upon VREG >3.0V, it moves to stand-by mode. As for LED driver, it is ready state. LED Lighting with EN = L -> H . LED lighting out with EN = H L it is same with Detecting TSD with Ta > 175, LED lighting out Deleting TSD with Ta < 155, LED lighting LED lighting out with STBY,EN=HL Detecting UVLO=L with VREG<2.9V
VSET
STBY
EN
VREG
3.0V
2.9V
UVLO internal signal
UVLO( )
TSD internal ) TSD( signal
ILED

Fig..7
Please be careful about a current flowing to the VCC side via the diode for electrostatic breakdown protection if a voltage is applied to STBY terminal or EN terminal earlier than to VCC terminal.
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7/12
2009.07 - Rev.A
BD9206EFV
Recommendation of Circuit figure
Technical Note
Fig..8
When you use VCC=24V ILED=20mA
Variety Resistance
Symbol R1R6 CVCC
Usage For reducing IC thermal loss For input by-pass capacitor For VREG phase compensation
Type MCR03Series15R0 GMR55DB31H106 GMR188R71A105
Maker ROHM murata murata
Value 15 10uF 1uF
Unit
capacitor CVREG
The points of manufacturing substrate For this IC, at the time of LED lighting, the temperature of the package increases due to heat generation of the constant current driver. Therefore, please bring the radiating fin on the back side of the package down to the GND with wide substrate pattern in order to promote heat radiation. In addition, the heat radiation can be further promoted by putting a thermal VIA in. The heat radiation can be promoted similarly by connecting the unconnected terminals, TEST terminals and unused terminals of LED1~6 to GND.
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8/12
2009.07 - Rev.A
BD9206EFV
Technical Note
The calculation of electric power consumption for IC and the deciding method of external resistance value Electric power consumption of IC is decided with formula below. P(N)=ICC*VCC+[(Vo-RL*ILED)-(Vf+Vf+VfT)*M]*N*ILED IC Consumed electric ICC Vo current VCC Input voltage RL LED Vf voltage Vf normal temperature typ Vf LED Vf Variation VF VfT LED Vf Temperature M variation M Stage number around LED 1 line N N LED line number LED Constant current ILED ILED value Voltage OF LED anode Vo side external resistance RL Fig..9 (external loss) Please insert the heat-radiation resistor RL in order to decrease the heat radiation at the IC. If the value of RL is made to be larger, then the heat radiation of the IC is decreased, but if the terminal voltage VLED of the LED driver is less than 0.6V, then the constant current operation becomes impossible, therefore please set the RL in such a way that the following expression is met: VLED=Vo-Vf+Vf+VfT*M-RL*ILED>0.6V Please set the ILED and RL in such a way that the relational expressions & are met. Moreover, the permissible loss of the package is as shown in the following graph.
HT SS OP- B2 0 Pd
4 .0
3 .5
3.20
3 .0
P d(W)
2 .5
allowable loss
2.30
1 Heat dissipation ( copper foil on surface Omm2 0mm2
1layer baseplate

copper foil on Inside 2 and outside layer ( 4900mm2)
2layer baseplate Heat dissipation
2 .0
1 .5
1.00
1 .0
4900mm2)
( copper foil on whole layer4900mm2 4900mm2
4layer baseplate 4 Heat dissipation
0 .5
0 .0 0 25 50 75 100 125 150
Temperature around Ta Ta()
Fig..10
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9/12
2009.07 - Rev.A
BD9206EFV
Input/output equivalent circuit 6LED1, 7LED2, 8LED3, 13LED4, 14LED5, 15LED6
Technical Note
2STBY 3EN, 17TEST
18VSET
1VREG
CL7V
9, 10, 11, 12, 19N.C.
N.C. pin is not connected
The voltage clamp element of 7V is connected to CL7V.
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10/12
2009.07 - Rev.A
BD9206EFV
Technical Note
Notes for use 1.) The absolute maximum ratings We pay sufficient attention for quality control to this product but If the absolute maximum ratings are exceeded, such as with applied voltage or operational temperature range, a degradation or a destruction may occur. The short or open modes cannot be specified. so if special modes which exceed the absolute maximum ratings are assumed, physical safety precautions such as fuses should be in place. 2.) Reverse connection of power supply connector The reverse connection of power connector may cause damage to IC. Please take countermeasures such as inserting a diode between the power supply and IC's external power supply pin for protection against the damage caused by the reverse connection. 3.) Power supply line The return of the regenerated current is caused by the back electromotive force of the external coil, so please take the measures such as inserting a capacitor between power supply and GND as a route of regenerated current, and determine the capacitance value after thoroughly ensuring that there is no problems in the Characteristics of electrolyte capacitor, such as no loss of capacitance at low temperature. Heat design should take into account of power dissipation (Pd) under actual usage conditions, with wide enough margins 4.) GND Potential The potential of the GND terminal should be the minimum potential under all operating conditions. 5.) Heat Design Heat design should take into account of power dissipation under actual usage conditions, with wide enough margins. 6.) Short-circuiting between Terminals and Incorrect Mounting When mounting to the PWB, pay special attention to the direction and proper placement of the IC. If the IC is attached incorrectly, it may be destroyed. Furthermore, there is also a possibility of breakdown, when the foreign body enters during outputting and between power supply and GND. 7.) The operation in the strong magnetic fields Please be careful that there is a possibility of malfunction which is happening when you use it in a strong electromagnetic field. 8.) ASO Please do the setting in such a way that the output Tr does not exceed the absolute maximum rating and ASO in case of using this IC. For CMOS IC and the IC with more than one power supply, a rush current may flow instantaneously at the time of power on, so please be careful about power supply coupling capacitance, power supply, GND pattern wiring width and length. 9.) Thermal shutdown circuit (TSD circuit) This IC incorporates a built-in thermal shutdown circuit (TSD circuit). The TSD circuit is that has designed only to shut the IC off to prevent the thermal runaway operationnot for IC protection or guarantee as purpose. Therefore, please do not continue to use the IC after operating this circuit and also do not use the IC designating operation as prerequisite. 10.) Inspection of the Set Substrate If a condenser is connected to a pin with low impedance when inspecting the set substrate, stress may be placed on the IC, so please be sure to discharge after each process. Moreover, please be sure to turn off the power supply before connecting & inspecting or before detaching when it is connected to jig at inspection process. 11.) About IC terminal input This IC is a monolithic IC, and there are a P+ isolation and the P substrate for separation of element between each element. There is a P-N junction formed between this P-layer and each element's N-layer, forming every parasitic element, as shown in Fig.15, when resistance and transistor are connected with terminal In the case of GND>terminal A with resistance or GND>(terminal B) with transistor(NPN), the P-N junction operates as a parasitic diode. In addition, when GND> (terminal B) with the transistor (NPN), the parasitic NPN transistor operates due to the aforementioned parasitic diode and the N layer of the other element approached With the IC's configuration, the production of parasitic elements is inevitable. The operation of parasitic elements causes interferences between circuits, leading to malfunction and even destruction. Therefore, uses which cause the parasitic elements to operate, such as applying voltage to the input terminal which is lower than the GND (P-substrate), should be avoided.
(terminalB) (B)

C
B
(NPN)
(terminalA) (A)
Resistance
Transistor
E
N
N
N GND
N
P Substrate P
N GND GND
Parasitic Element
P
P
P
P
N
GND P P
(terminalA) (A)
(terminalB) (B)
BC E GND
Parasitic Element
P Substrate Parasitic Element P
Parasitic Element
other element approached
Fig..11 IC Fig.11 Simple Structure of bipolar IC (Sample)
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11/12
2009.07 - Rev.A
BD9206EFV
Ordering part number
Technical Note
B
D
9
Part No.
2
0
6
E
F
V
-
E
2
Part No.
Package EFV: HTSSOP-B20
Packaging and forming specification E2: Embossed tape and reel
HTSSOP-B20
6.50.1 (MAX 6.85 include BURR) (4.0)
20 11

Tape Quantity
0.50.15 1.00.2
Embossed carrier tape (with dry pack) 2500pcs E2
The direction is the 1pin of product is at the upper left when you hold
6.40.2
4.40.1
Direction of feed
(2.4)
( reel on the left hand and you pull out the tape on the right hand
)
1
10
0.325
1.0MAX
+0.05 0.17 -0.03 S
0.850.05
0.080.05
0.65 +0.05 0.24 -0.04
0.08 S
1pin
Direction of feed
(Unit : mm)
Reel
Order quantity needs to be multiple of the minimum quantity.
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12/12
2009.07 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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