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PDF BD9479FV Data sheet ( Hoja de datos )
| Número de pieza | BD9479FV | |
| Descripción | White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
LED Drivers for LCD Backlights
White LED Driver for large LCD
Panels (DCDC Converter type)
BD9479FV
●General Description
BD9479FV 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. BD9479FV 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 BD9479FV 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
Oscillator frequency:
150kHz (RT=100kΩ)
Operating Current:
8.7mA (typ.)
Operating temperature range:
-40℃ to +85℃
●Applications
TV, Computer Display, Notebook, LCD Backlighting
●Features
8ch LED constant current driver (external PNP Tr
Type)
Maximum LED setting current 500mA (VREF pin
setting)
Build-in DC/DC converter
Analog Dimming (Linear) function
Individual channel PWM Dimming function
LED protection function (Open Short protection)
[PWM-independent Type]
Output short protection (OVP)
Built-in Timer latch function (CP)
Built-in under voltage Lockout function (UVLO)・over
voltage protection (OVP)
Built-in FAIL indication function
Built-in OVP voltage Feedback function
Built-in PWM-independent soft start circuit
SSOP-B40 Package
●Package
SSOP-B40:
Pin Pitch:
W(Typ.) D(Typ.) H(Max.)
13.6mm x 7.80mm x 1.80mm
0.65mm
●Typical Application Circuit
Figure 1. SSOP-B40
Figure 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
1/26
TSZ02201-0F1F0C100020-1-2
25.Sep.2015 Rev.002
1 page  
BD9479FV
●Pin Descriptions
Pin No
Pin Name
1 REG50
2N
3 PGND
4 CS
5 OVP
6 CP
7 LSP
8 STB
9 BS1
10 BS2
11 BS3
12 BS4
13 BS5
14 BS6
15 BS7
16 BS8
17 PWM1
18 PWM2
19 PWM3
20 PWM4
21 PWM5
22 PWM6
23 PWM7
24 PWM8
25 CL8
26 CL7
27 CL6
28 CL5
29 CL4
30 CL3
31 CL2
32 CL1
33 VREF
34 FB
35 SS
36 RT
37 UVLO
38 AGND
39 FAIL
40 VCC
In/Out
Out
Out
-
In
In
Out
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
In
Out
Out
Out
Out
Out
Out
Out
Out
In
In/Out
Out
Out
In
-
Out
-
Function
5V regulator output for N output pin
DC/DC switching output pin
Power GND
DCDC external NMOS current monitor pin
Overvoltage protection detection pin
Timer Latch setting pin
LED short voltage setting pin
Enable pin
PNP Tr Base connecting pin１
PNP Tr Base connecting pin２
PNP Tr Base connecting pin３
PNP Tr Base connecting pin４
PNP Tr Base connecting pin５
PNP Tr Base connecting pin６
PNP Tr Base connecting pin７
PNP Tr Base connecting pin８
Dimming signal input pin１
Dimming signal input pin２
Dimming signal input pin３
Dimming signal input pin４
Dimming signal input pin５
Dimming signal input pin６
Dimming signal input pin７
Dimming signal input pin８
PNP Tr collector ・current detection pin８
PNP Tr collector ・current detection pin７
PNP Tr collector ・current detection pin６
PNP Tr collector ・current detection pin５
PNP Tr collector ・current detection pin４
PNP Tr collector ・current detection pin３
PNP Tr collector ・current detection pin２
PNP Tr collector ・current detection pin１
LED voltage setting pin
DCDC phase-compensation pin
Soft Start pin
DCDC frequency setting resistor connection pin
Under voltage Lockout protection pin
Analog GND
Error detection output pin
Power supply pin
Datasheet
Rating [V]
-0.3 ~ 7
-0.3 ~ 7
-
-0.3 ~ 7
-0.3 ~ 20
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 20
-0.3 ~ 40
-0.3 ~ 40
-0.3 ~ 40
-0.3 ~ 40
-0.3 ~ 40
-0.3 ~ 40
-0.3 ~ 40
-0.3 ~ 40
-0.3 ~ 20
-0.3 ~ 20
-0.3 ~ 20
-0.3 ~ 20
-0.3 ~ 20
-0.3 ~ 20
-0.3 ~ 20
-0.3 ~ 20
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 20
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 7
-0.3 ~ 20
-
-0.3 ~ 36
-0.3 ~ 36
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/26
TSZ02201-0F1F0C100020-1-2
25.Sep.2015 Rev.002
5 Page 
BD9479FV
Datasheet
●LED current setting (VREF pin, CLx pin)
Please decide VREF pin input voltage first.When Analog dimming is performed,
please be noted that VREF pin input voltage range is (0.6V ～ 3.0V), and decide the
input voltage in normal operation.Basically, if VREF pin voltage is high, it will cause
power dissipation of external PNP Tr become high, so it is preferred to set the VREF pin
voltage lower.
Later, VREF＝0.9V will be set as basic.For example if you create 0.9V from REG50, it
is possible to use resistive divider by setting 82kohm and 18kohm.
In BD9479FV, the LED current detection is performed by CLx pin.CLx pin is controlled
so that the voltage of 1/3V(typ.) of VREF voltage.If VREF=0.9V, CLx=0.3V to control
external PNP Tr.Therefore,if 「RCL」 is set as a resistance which between CLx pin and
GND, and VREF pin voltage is set as 「VVREF」, LED current 「ILED」can be calculated as
below.
RCL
[ohm]
VVREF [V ]
I LED [ A] 3
For current setting, set at each channel.For this reason, in 1ch～4ch and 5ch～8ch, it
is possible to change current by setting 「RCL」value.
●DCDC operation frequency setting (RT Pin)
The operation frequency of DCDC output is set by resistance which connected to RT pin.
○The relationship between operation and RT resistance (ideal)
RRT
15000
fSW [kHz]
[k]
Here, fsw＝DCDC converter oscillation frequency[kHz]
Above is an ideal equation which do not putted with correction terms。
For accurate frequency setting, please confirm on the real system。
but, the frequency setting range is 100kHz～800kHz。
Ideal
【Setting Example】
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/26
TSZ02201-0F1F0C100020-1-2
25.Sep.2015 Rev.002
11 Page | ||
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| PDF Descargar | [ Datasheet BD9479FV.PDF ] | |
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