LED Driver. BD94122F Datasheet

BD94122F Driver. Datasheet pdf. Equivalent

BD94122F Datasheet
Recommendation BD94122F Datasheet
Part BD94122F
Description White LED Driver
Feature BD94122F; Datasheet LED Drivers for LCD Backlights PFC Direct Current Resonance Type White LED Driver for Lar.
Manufacture ROHM
Datasheet
Download BD94122F Datasheet




ROHM BD94122F
Datasheet
LED Drivers for LCD Backlights
PFC Direct Current Resonance Type
White LED Driver for Large LCD
BD94122F
General Description
BD94122F is a current resonance type LED Driver, which
can connect to PFC directly. LED current is controlled by
driving output frequency. Because this IC can use half
bridge structure, it can reduce the number of external
components.
BD94122F has some protection functions against fault
conditions such as Over Voltage Protection(OVP), LED
Short Protection(LSP) and LED Open Protection
Detection(LOP).
Key Specifications
Power Supply Voltage Range:
Output Driving Frequency
(Minimum Frequency Setting):
Circuit Current:
Operating Temperature Range:
VCC: 9.0V to 18.0V
60kHz(RRT=68kΩ)
5.0mA(Typ)
-40°C to +85°C
Package
SOP18
W(Typ) x D(Typ) x H(Max)
11.20mm x 7.80mm x 2.01mm
Features
1 Channel Push Pull Control
Current Feedback by Driving Frequency Resolution
Timer Latch Circuit
Under Voltage Detection for IC’s Power Line (VCC
UVLO)
Output Over Voltage Protection
Driving Output Frequency (Minimum Frequency
Setting) Tolerance: ±5%
Error Signal Output from FAIL Pin
Control IC Power On and Off by STB Pin
Burst Control by External PWM
Analog Dimming by External DC
Pulse/DC Conversion Function for ADIM
Applications
TV, Computer Display, LCD Backlighting
Typical Application Circuit
PVIN
RN12
LED1P
LED2P
RVCC
CVCC
RSTB1
RSTB2
CSTB
LED2N
RIS1 LED1N
RIS
CIS
Product structure: Silicon monolithic integrated circuit
www.rohm.com
© 2018 ROHM Co., Ltd. All rights reserved.
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ROHM BD94122F
BD94122F
Contents
General Description ........................................................................................................................................................................1
Features..........................................................................................................................................................................................1
Applications ....................................................................................................................................................................................1
Key Specifications ..........................................................................................................................................................................1
Package..........................................................................................................................................................................................1
Typical Application Circuit ...............................................................................................................................................................1
Pin Configuration ............................................................................................................................................................................3
Pin Description................................................................................................................................................................................3
Block Diagram ................................................................................................................................................................................4
Pin Function Descriptions ...............................................................................................................................................................5
Detection Condition List of the Protection Functions ......................................................................................................................8
Operation List of the Protection Function........................................................................................................................................8
Absolute Maximum Ratings ............................................................................................................................................................9
Thermal Resistance........................................................................................................................................................................9
Recommended Operating Conditions ...........................................................................................................................................10
External Components Recommended Ranges.............................................................................................................................10
Electrical Characteristics............................................................................................................................................................... 11
Typical Performance Curves.........................................................................................................................................................13
Timing Chart .................................................................................................................................................................................14
Application Example .....................................................................................................................................................................18
I/O Equivalence Circuits................................................................................................................................................................19
Operational Notes.........................................................................................................................................................................20
Ordering Information.....................................................................................................................................................................22
Marking Diagram ..........................................................................................................................................................................22
Physical Dimension and Packing Information ...............................................................................................................................23
Revision History............................................................................................................................................................................24
www.rohm.com
© 2018 ROHM Co., Ltd. All rights reserved.
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ROHM BD94122F
BD94122F
Pin Configuration
(TOP VIEW)
18 17 16 15 14 13 12 11 10
123456789
Pin Description
Pin No. Pin Name
1 VCC
2 STB
3 GND
4 LSPSET
5 FAIL
6 PDIM
7 PWM2DC
8 ADIM
9 IS
10 VOM1
11 VOM2
12 SSFB
13 NC
14 RT
15 SOFTON
16 PGND
17 N2
18 N1
IN/OUT
IN
IN
IN
IN
OUT
IN
IN
IN/OUT
IN
IN
IN
OUT
-
OUT
OUT
IN
OUT
OUT
Function
Power supply for IC (built in UVLO function).
Power ON/OFF control for IC (STB=L: Power OFF, STB=H: Power ON).
Ground for internal signal in IC.
LED short protection voltage setting.
Error signal output (Normal: L, Error: Open).
PWM signal input for burst dimming.
Pulse/DC converting.
Pulse signal is translated to flat by 100kΩ resistor in IC and the capacitor connected
to ADIM.
DC signal output of Pulse/DC converting and DC signal input for analog dimming.
Error amplifier input for LED current feedback. IS Low detection and IS High
detection input.
Channel 1 over voltage protection and LED short protection.
Channel 2 over voltage protection and LED short protection.
Set phase compensation of feedback loop.
When VSSFB is 3.5V or more, LED OPEN protection and LED SHORT protection are
enable.
When VSSSB is 4.0V or more, SSFB MAX protection is enable.
No Connection(Open).
Minimum driving frequency and dead time setting.
Basic frequency and dead time are set by the resistor between RT and GND, and
driving frequency modulation range is set by RT resistor.
Soft on. When PDIM is set from high to low (or from low to high), a driving frequency
changes from normal to maximum (or maximum to normal), the frequency changing
speed can be adjusted by SOFTON capacitor setting.
Power ground for N1 and N2 drivers.
Gate drive output for low side external FET.
Gate drive output for high side external FET.
www.rohm.com
© 2018 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
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TSZ02201-0T5T0B500040-1-2
23.Mar.2018 Rev.001







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