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Número de pieza BD93941EFV
Descripción White LED Driver
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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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

1 page




BD93941EFV pdf
BD93941EFV BD93941FP
Pin Descriptions (BD93941EFV)
Pin No
Pin Name
In/Out
1
AUTO
Out
2
REG58
Out
3 CS In
4 N Out
5 DCDC_GND -
6 OVP In
7 STB In
8
LED1
Out
9
LED2
Out
10 LED_GND
-
11
LED3
Out
12
LED4
Out
13 PWM In
14
ISET
Out
15 GND
-
16 SS Out
17 FB In/Out
18 RT Out
19 ADIM In
20 VCC In
Function
Auto-restart time setting pin
Power supply for N pin
DC/DC output current detection and OCP detection pin
DC/DC switching output pin
Power GND pin
Overvoltage protection detection pin
Enable pin
Output pin 1 for LED
Output pin 2 for LED
Ground pin for LED
Output pin 3 for LED
Output pin 4 for LED
External PWM light modulation signal input pin for LED1-4
LED current setting resistor connection pin
Analog GND pin
Soft start pin / LED protection masking time setting pin.
Error amp output pin
DC/DC drive frequency setting resistor connection pin.
Analog dimming DC voltage input pin
Power supply pin
Pin Descriptions (BD93941FP)
Pin No
Pin Name
In/Out
1
AUTO
Out
2
REG58
Out
3 CS In
4 N In
5 DCDC_GND -
FIN1
GND
-
6 OVP In
7 STB In
8
LED1
Out
9
LED2
Out
10 LED_GND
-
11 N.C.
-
12
LED3
Out
13
LED4
Out
14 PWM In
15
ISET
Out
FIN2
GND
-
16 SS Out
17 FB In/Out
18 RT Out
19 ADIM In
20 VCC In
Function
Auto-restart time setting pin
Power supply for N pin
DC/DC output current detection and OCP detection pin
DC/DC switching output pin
Power GND pin
Overvoltage protection detection pin
Enable pin
Output pin 1 for LED
Output pin 2 for LED
Ground pin for LED
Non connection pin
Output pin 3 for LED
Output pin 4 for LED
External PWM light modulation signal input pin for LED1-4
LED current setting resistor connection pin
Analog GND pin
Soft start pin / LED protection masking time setting pin.
Error amp output pin
DC/DC drive frequency setting resistor connection pin.
Analog dimming DC voltage input pin
Power supply pin
Datasheet
Rating [V]
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-
-0.3 to 36
-0.3 to 36
-0.3 to 60
-0.3 to 60
-
-0.3 to 60
-0.3 to 60
-0.3 to 36
-0.3 to 7
-
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 36
-0.3 to 36
Rating [V]
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-
-
-0.3 ~ 36
-0.3 ~ 36
-0.3 ~ 60
-0.3 ~ 60
-
-
-0.3 ~ 60
-0.3 ~ 60
-0.3 ~ 36
-0.3 ~ 7
-
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 36
-0.3 ~ 36
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/27
TSZ02201-0F1F0C100270-1-2
10.Oct.2013 Rev.001

5 Page





BD93941EFV arduino
BD93941EFV BD93941FP
Startup operation and soft start (SS) capacitance setting
The following section describes the sequence for the startup of this IC.
Datasheet
SS
SLOPE
SS
Css
FB
5V
QD
PWM
COMP
SS=FB
Circuit
OSC
DRIVER
LED_OK
VLED
LED_DRIVER
N
LED
PWM
VOUT
Figure 11. Startup waveform
Figure 12. Circuit behavior at startup
Description of startup sequence
(1) Set the STB and PWM pin to “ON”.
(2) Set sll systems to “ON”, SS charge will be initiated.
At this time, a circuit in which SS pin voltage for soft start becomes equal to FB pin voltage operates to equalize the
FB pin and SS pin voltages regardless of whether the PWM pin is set to Low or High level.
(3) Since the FB pin and SS pin reach the lower limit of the internal sawtooth wave of the IC, the DC/DC converter
operates to start VOUT voltage rising.
(4) The Vout voltage continues rising to reach a voltage at which LED current starts flowing.
(5) When the LED current reaches the set amount of current, isolate the FB circuit from the SS circuit. With this, the
startup operation is completed.
(6) After that, conduct normal operation following the feedback operation sequence with the LED pins.
If the SS pin voltage reaches 3.7V or more, the LED protection function will be activated to forcedly end the SS and
FB equalizing circuit.
SS capacitance setting procedure
As aforementioned, this IC stops DC/DC converter when the PWM pin is set to Low level and conducts step-up operation
only in the section in which the PWM pin is maintained at High level. Consequently, setting the PWM duty cycle to the
minimum will extend the startup time. The startup time also varies with application settings of output capacitance, LED
current, output voltage, and others.
Startup time at minimum duty cycle can be approximated according to the following method:
Make maeasurement of VOUT startup time with a 100% duty cycle, first. Take this value as “Trise100”.
The startup time “Trise_min” for the relevant application with the minimum duty cycle is given by the following equation.
Trise_ min
Trise_100[Sec]
Min_ Duty[ratio]
[Sec]
However, since this calculation method is just for approximation, use it only as a guide.
Make setting of time during which the SS pin voltage reaches the FB pin voltage longer than this startup time.
Assuming that the FB pin voltage is VFB, the time is given by the following equation:
Tss
Css[F]VFB[V ]
2[A]
[Sec]
As a result, it is recommended to make SS capacitance setting so that “Tss” will be greater than “Trise_min”
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
11/27
TSZ02201-0F1F0C100270-1-2
10.Oct.2013 Rev.001

11 Page







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