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Rohm Semiconductor Electronic Components Datasheet

BD93941FP Datasheet

White LED Driver

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BD93941FP pdf
Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD93941EFV BD93941FP
General Description
BD93941EFV and BD93941FP is a high efficiency driver
for white LEDs and designed for large LCDs. These ICs
are built-in a boost DCDC converters that employ an
array of LEDs as the light source. BD93941EFV and
BD93941FP have some protect function against fault
conditions, such as the over-voltage protection (OVP),
the over current limit protection of DCDC (OCP), the
short circuit protection (SCP), the open detection of LED
string. Therefore BD93941EFV and BD93941FP are
available for the fail-safe design over a wide range
output voltage.
Key Specification
Operating power supply voltage range: 9.0V to 35.0V
LED minimum current
30mA
LED maximum current:
200mA
Oscillator frequency:
150kHz (RT=100k)
Operating Current:
4.5mA (Typ.)
Operating temperature range:
-40°C to +85°C
Applications
TV, Computer Display, Notebook, LCD Backlighting
Features
4ch LED constant current driver and DC/DC converter
Maximum LED Current: 200mA
LED Feedback Voltage: 0.37V (@ADIM=2.5V)
so lower heat. Adjustable Feed Back Voltage
by following LED Current setting.
2% LED current accuracy (ADIM=2.5V,
when each LED is set to 100mA)
Analog current (Linear) dimming at ADIM pin
LED pin rating 60V
Individual detection and individual LED OFF for both
open and short circuits
Built-in ISET pin short-circuit protection circuit
Set Soft-Start time by external capacitor.
FET’s Gate (N pin) is driven by 5.8V swing
Built-in Vout discharge circuit for shutdown
Built-in Vout overvoltage protection (OVP) /
reduced voltage protection (SCP) circuit
HTSSOP-B20 and HSOP20 package with high heat
radiation efficiency
Package
HTSSOP-B20
HSOP20
W(Typ.) x D(Typ.) x H(Max.)
6.50mm x 6.40mm x 1.00mm
14.90mm x 7.80mm x 2.10mm
Figure 1(a). HTSSOP-B20
(BD93941EFV)
Figure 1(b). HSOP20
(BD93941FP)
Typical Application Circuit
VIN
VIN
Inductor
Diode
CIN
FET
PGND
AGND
COUT
REG58
CREG
RN2
RCS DN RN1
ROVP1
ROVP2
RRT
COVP
RFB CFB1
CFB2
CSS
RISET
CAUTO
ADIM
EXPOSED
PAD
REG58
N
DCDC_GND
CS
RT
OVP
FB
SS
ISET
AUTO
ADIM
STB
VCC
LED4
LED3
LED_GND
LED2
LED1
PWM
AGND
ON/OFF
RVCC
CVCC
CLED4
CLED3
CLED2
CLED1
PWM
Figure 2. Typical Application Circuit
Product structureSilicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has not designed protection against radioactive rays
1/27
TSZ02201-0F1F0C100270-1-2
10.Oct.2013 Rev.001


Rohm Semiconductor Electronic Components Datasheet

BD93941FP Datasheet

White LED Driver

No Preview Available !

BD93941FP pdf
BD93941EFV BD93941FP
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
AUTO, REG58, CS, N, ISET, SS, FB, RT terminal
voltage
Power dissipation (HTSSOP-B20)
(HSOP20)
Operating temperature range
AUTO, REG58, CS, N,
ISET, SS, FB, RT
Pd1
Pd2
Topr
Storage temperature range
Tstg
Junction temperature
Tjmax
*1 Ta = 25°C or more, diminished at -25.6mW/°C in the case of HTSSOP-B20
(when 4-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted)
*2 Ta = 25°C or more, diminished at -17.4mW/°C in the case of HSOP20
(when 4-layer / 70.0 mm x 70.0 mm x 1.6 mm board is mounted)
Ratings
36
36
60
7
3.20 *1
2.18 *2
-40 to +85
-55 to +150
150
Unit
V
V
V
V
W
°C
°C
°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)
ILED_MIN
ILED_MAX
VADIM1
30
200
0.2 to 2.7
mA *1
mA
*1,2
V
ADIM input voltage1 (don’t use ADIM function)
VADIM2
REG58 to 35.0
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.
Pin Configuration
HTSSOP-B20
1 AUTO
2 REG58
HSOP20
3 CS
4N
5 DCDC_GND
VCC
ADIM
RT
FB
SS
20
19
18
17
16
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
6 OVP
7 STB
8 LED1
9 LED2
10 LED_GND
ISET
PWM
LED4
LED3
N.C.
15
14
13
12
11
Figure 3. Pin Configuration
2/27
TSZ02201-0F1F0C100270-1-2
10.Oct.2013 Rev.001


Part Number BD93941FP
Description White LED Driver
Maker ROHM
Total Page 30 Pages
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BD93941FP pdf
BD93941FP Datasheet PDF
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