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PDF BD9486F Data sheet ( Hoja de datos )
| Número de pieza | BD9486F | |
| Descripción | LED Drivers | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
LED Drivers for LCD Backlights
1ch Boost up type
White LED Driver for large LCD
BD9486F
1.1 General Description
BD9486F is a high efficiency driver for white LEDs and is
designed for large LCDs. BD9486F has a boost DCDC
converter that employs an array of LEDs as the light
source.
BD9486F has some protect functions against fault
conditions, such as over-voltage protection (OVP), over
current limit protection of DCDC (OCP), LED OCP
protection, and Over boost protection (FBMAX).
Therefore it is available for the fail-safe design over a
wide range output voltage.
Key Specifications
Operating power supply voltage range:9.0V to 18.0V
Oscillator frequency of DCDC: 150kHz (RT=100kΩ)
Operating Current:
2.6mA(Typ.)
Operating temperature range:
-40°C to +85°C
1.2 Package(s)
SOP16
W(Typ) x D(Typ) x H(Max)
10.00mm x 6.20mm x 1.71mm
Pin pitch 1.27mm
Features
DCDC converter with current mode
VOUT discharge function at shutdown
LED protection circuit (Over boost protection, LED
OCP protection)
Over-voltage protection (OVP) for the output voltage
Vout
Adjustable soft start
Adjustable oscillation frequency of DCDC
Wide range of analog dimming 0.2V to 3.0V
UVLO detection for the input voltage of the power
stage
Figure 1. SOP16
Applications
TV, Computer Display, LCD Backlighting
1.3 Typical Application Circuit(s)
Figure 2. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has not designed protection against radioactive rays
1/34
TSZ02201-0F1F0C100240-1-2
13.Feb.2014 Rev.004
http://www.Datasheet4U.com
1 page  
BD9486F
●2.1 Pin Function
No.
Pin
Name
1 REG50
2 STB
3 OVP
4 UVLO
5 SS
6 PWM
7 CP
8 ADIM
9 RT
10 FB
11 ISENSE
12 GND
13 DIMOUT
14 GATE
15 CS
16 VCC
IN/OUT
Out
In
In
In
Out
In
Out
In
Out
Out
In
-
Out
Out
In
In
Function
5.0V output voltage pin and shutdown
timer pin
IC ON/OFF pin
Over voltage protection detection pin
Under voltage lock out detection pin
Slow start setting pin
External PWM dimming signal input pin
Charge timer for abnormal state
ADIM signal input pin
DC/DC switching frequency setting pin
Error amplifier output pin
LED current detection input pin
-
Dimming signal output for NMOS
DC/DC switching output pin
DC/DC output current detect pin,
OCP input pin
Power supply pin
Rating [V]
-0.3 to 7
-0.3 to 20
-0.3 to 20
-0.3 to 20
-0.3 to 7
-0.3 to 20
-0.3 to 7
-0.3 to 20
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to VCC
-0.3 to VCC
-0.3 to 7
-0.3 to 20
Datasheet
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/34
TSZ02201-0F1F0C100240-1-2
13.Feb.2014 Rev.004
http://www.Datasheet4U.com
5 Page 
BD9486F
○Pin 13: DIMOUT
This is the output pin for external dimming NMOS. The table below shows the rough output
logic of each operation state, and the output H level is VCC. Please refer to “3.5 Timing Chart”
for detailed explanations, because DIMOUT logic has an exceptional behavior. Please insert
the resistor RDIM between the dimming MOS gate to improve the over shoot of LED current, as
PWM turns from low to high.
Status
Normal
Abnormal
DIMOUT output
Same logic to PWM
GND Level
Datasheet
Figure 15. DIMOUT terminal circuit example
○Pin 14: GATE
This is the output terminal for driving the gate of the boost MOSFET. The high level is VCC. Frequency can be set by the
resistor connected to RT. Refer to <RT> pin description for the frequency setting.
○Pin 15: CS
The CS pin has two functions.
1. DC / DC current mode Feedback terminal
The inductor current is converted to the CS pin voltage by the sense resistor
RCS. This voltage compared to the voltage set by error amplifier controls the
output pulse.
2. Inductor current limit (OCP) terminal
The CS terminal also has an over current protection (OCP). If the voltage is
more than 0.4V(typ.), the switching operation will be stopped compulsorily. And
the next boost pulse will be restarted to normal frequency.
In addition, the CS voltage is more than 1.0V(typ.) during four GATE clocks, IC
will be latch off. As above OCP operation, if the current continues to flow
nevertheless GATE=L because of the destruction of the boost MOS, IC will
stops the operation completely.
Both of the above functions are enabled after 300ns (typ) when GATE pin Figure 16. CS terminal circuit example
asserts high, because the Leading Edge Blanking function (LEB) is included
into this IC to prevent the effect of noise.
Please refer to section “3.3.1 OCP Setting / Calculation Method for the Current Rating of DCDC Parts”, for detailed
explanation.
If the capacitance Cs in the right figure is increased to a micro order, please be careful that the limited value of NMOS
drain current Id is more than the simple calculation. Because the current Id flows not only through Rcs but also through
Cs, as the CS pin voltage moves according to Id.
○Pin 16: VCC
This is the power supply pin of the IC. Input range is from 9V to 18V.
The operation starts at more than 7.5V(typ) and shuts down at less than 7.2V(typ)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/34
TSZ02201-0F1F0C100240-1-2
13.Feb.2014 Rev.004
http://www.Datasheet4U.com
11 Page | ||
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