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PDF BD9394FP Data sheet ( Hoja de datos )
| Número de pieza | BD9394FP | |
| Descripción | LED Drivers | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD9394FP, BD9394EFV
●General Description
BD9394FP, BD9394EFV is a high efficiency driver for
white LEDs and designed for large LCDs. This IC is
built-in a boost DCDC converters that employ an array of
LEDs as the light source. BD9394FP, BD9394EFV has
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
BD9394FP, BD9394EFV is 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:
150mA
Oscillator frequency:
150kHz (RT=100kΩ)
Operating Current:
4.5mA (Typ.)
Operating temperature range:
-40℃ to +85℃
●Applications
TV, Computer Display, Notebook, LCD Backlighting
●Features
4ch LED constant current driver and DC/DC converter
Maximum LED Current: 150mA
LED Feedback Voltage: 0.37V (@NADIM=2.62V),
so lower heat. Adjustable Feed Back Voltage
by following LED Current setting.
±2% LED current accuracy (NADIM=2.62V,
when each LED is set to 100mA)
Analog current (Linear) dimming at NADIM 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
Adjustable LED Short Protection Voltage
by LSP terminal
HSOP20, HTSSOP-B24 package with high heat
radiation efficiency
●Package
HSOP20
HTSSOP-B24
W(Typ.) x D(Typ.) x H(Max.)
14.90mm x 7.80mm x 2.10mm
7.80mm x 7.60mm x 1.00mm
● Typical Application Circuit (4 light with PWM)
VIN
VIN
Inductor
Diode
Fig.1(a) HSOP20
CIN
FET
PGND
AGND
REG58
COUT
REG58
CREG
RN2
RCS DN RN1
RRT
ROVP1
ROVP2
COVP
RFB CFB1
RLSP1
RLSP2
CFB2
CLSP
CSS
RISET
CAUTO
NADIM
FIN1, 2
REG58
N
DCDC_GND
CS
RT
OVP
FB
LSP
SS
ISET
AUTO
NADIM
STB
VCC
LED4
LED3
LED_GND
LED2
LED1
PWM
AGND
ON/OFF
RVCC
CVCC
CLED4
CLED3
CLED2
CLED1
PWM
Fig.1(b) HTSSOP-B24
Fig.2 Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/28
TSZ02201-0F1F0C100180-1-2
09.Nov.2012 Rev.002
http://www.Datasheet4U.com
1 page  
BD9394FP, BD9394EFV
Datasheet
●Pin Descriptions (BD9394FP)
Pin No
Pin Name
In/Out
1
AUTO
Out
2
REG58
Out
3 CS In
4 N In
5 DCDC_GND -
FIN1
GND
-
6 LSP In
7 OVP In
8
LED1
Out
9
LED2
Out
10 LED_GND
-
11 STB In
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 NADIM In
20 VCC In
●Pin Descriptions (BD9394EFV)
Pin No
Pin Name
In/Out
1
AUTO
Out
2
REG58
Out
3 CS In
4 N In
5 DCDC_GND -
6 LSP In
7 OVP In
8
LED1
Out
9
LED2
Out
10 N.C.
-
11 LED_GND
-
12 N.C.
-
13 STB In
14
LED3
Out
15 N.C.
-
16
LED4
Out
17 PWM In
18
ISET
Out
19 GND
-
20 SS Out
21 FB In/Out
22 RT Out
23 NADIM In
24 GND
-
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
Analog GND pin
LED Short detection voltage setting resistor connection pin
Overvoltage protection detection pin
Output pin 1 for LED
Output pin 2 for LED
Ground pin for LED
Enable 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
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
LED Short detection voltage setting resistor connection pin
Overvoltage protection detection pin
Output pin 1 for LED
Output pin 2 for LED
Unconnected pin.
Ground pin for LED
Overvoltage protection detection pin.
Enable pin
Output pin 3 for LED
DC/DC switching output pin.
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
Ground pin for analog block.
Rating [V]
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-
-
-0.3 ~ 7
-0.3 ~ 36
-0.3 ~ 60
-0.3 ~ 60
-
-0.3 ~ 36
-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
Rating [V]
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-
-0.3 ~ 7
-0.3 ~ 36
-0.3 ~ 60
-0.3 ~ 60
-
-
-
-0.3 ~ 36
-0.3 ~ 60
-
-0.3 ~ 60
-0.3 ~ 36
-0.3 ~ 7
-
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 36
-
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/28
TSZ02201-0F1F0C100180-1-2
09.Nov.2012 Rev.002
http://www.Datasheet4U.com
5 Page 
BD9394FP, BD9394EFV
Datasheet
○SS (HSOP20:16pin / HTSSOP-B24：20pin)
The SS pin is used to make setting of soft start time and duty for soft start. It performs constant current charge of 2.0 uA
to the external capacitor connected with SS terminal, which enables soft-start of DC/DC converter.
Since the LED protection function (OPEN/SHORT detection) works when the SS terminal voltage reaches 3.7 V (typ.) or
higher, it must be set to bring stability to conditions such as DC/DC output voltage and LED constant current drive
operation, etc. before the voltage of 3.7 V is detected.
○FB (HSOP20:17pin / HTSSOP-B24：21pin)
The FB pin is an output pin used for DC/DC current mode control error amplifier. In other words, the FB pin detects the
voltages of LED pins (1 to 4) and controls inductor current so that the pin voltage of the LED located in the row with the
highest Vf will come to 0.37V (NADIM=(2.62)V, ILED=100mA). As a result, the pin voltages of other LEDs become higher
by Vf variation. After completion of soft start, the FB pin is put into the high-impedance state with the PWM signal being in
the low state, thus maintaining the FB voltage.
○RT (HSOP20:18pin / HTSSOP-B24：22pin)
The RT pin is used to connect a DC/DC frequency setting resistor. DC/DC drive frequency is determined by connecting
the RT resistor.
cDrive frequency vs. RT resistance (Ideal)
R RT
=
15000
f SW [kHz ]
[kΩ]
When RT is 100kΩ, Fsw is 150kHz(typ.). However, drive frequency setting should be made in the range of 100 kHz to
800 kHz.
○NADIM (HSOP20:19pin / HTSSOP-B24：23pin)
NADIM pin is for analog dimming. Output current is proportionality with input voltage (negative). Basically, NADIM pin
assumes the voltage inputted externally using high accuracy of resistive divider and etc., IC internally is in OPEN (High
impedance) condition.
Please be sure to apply externally for Resistive divider and etc. from REG58 output. Cannot use in an OPEN condition.
○VCC (HSOP20:20pin / HTSSOP-B24：24pin)
The VCC pin is used to supply power for the IC in the range of 9 to 35V.
If the VCC pin voltage reaches 7.5V (Typ.) or more, the IC will initiate operation. If it reaches 7.2V (Typ.) or less, the IC
will be shut down.
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/28
TSZ02201-0F1F0C100180-1-2
09.Nov.2012 Rev.002
http://www.Datasheet4U.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BD9394FP.PDF ] | |
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