BD93942F Datasheet, PDF (2/30 Pages) Rohm – White LED Driver for large LCD Panels (DCDC Converter type)

BD93942F
Datasheet
Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Power supply voltage
VCC
STB, ADIM, OVP, PWM terminal voltage
STB, ADIM, OVP, PWM
LED1 to 4 terminal voltage
LED1 to 4
REG58, CS, N, ISET, SSFB, RT terminal voltage
REG58, CS, N,
ISET, SSFB, RT
Power dissipation (SOP16)
Pd
Operating temperature range
Topr
Storage temperature range
Tstg
Junction temperature
*1 Ta = 25°C or more, diminished at -5mW/°C in the case of SOP16
(when 1-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted)
Tjmax
Ratings
Unit
36
V
36
V
60
V
7
V
0.62 *1
W
-40 to +85
°C
-55 to +150
°C
150
°C
Operating Ratings
Parameter
Symbol
Limits
Unit
VCC supply voltage
VCC
9.0 to 35.0
V
Min. output current of LED1 to 4
Max. output current of LED1 to 4
ADIM input voltage1 (use ADIM function)
ADIM input voltage1 (don’t use ADIM function)
ILED_MIN
ILED_MAX
VADIM1
VADIM2
30
150
0.2 to 2.7 (normal op.)
1.0 to 2.7 (start up)
REG58 to 35.0
mA *1
mA
*1,2
V *3
V
DC/DC oscillation frequency
Fsw
100 to 800
kHz
Min. on-duty time for PWM light modulation
PWM_MIN
30
μs
*1 The amount of current per channel.
*2 If LED makes significant variations in its reference voltage, the driver will increase power dissipation, resulting in a rise
in package temperature.
To avoid this problem, design the board with thorough consideration given to heat radiation measures.
*3 To avoid unused LED pin’s misdetection, set ADIM within 1.0V to 2.7V at start up stage. After unused LED pin’s
detection, set ADIM within 0.2V to 2.7V in normal operation.
Pin Configuration
1 _REG58
2 CS
3N
4 GND
5 OVP
6 STB
7 LED1
8 LED2
VCC ¹⁶
ADIM 15
RT 14
SSFB 13
ISET 12
PWM 11
LED4 10
LED3 9
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TSZ22111・15・001
SOP16
Figure 3. Pin Configuration
2/26
TSZ02201-0F5F0C100050-1-2
12.Aug.2015 Rev.002