BD94121F Datasheet, PDF (6/28 Pages) Rohm – PFC Direct current resonance type White LED Driver for Large LCD

BD9412F
Pin Description
Pin No. Pin Name
1
VCC
2
STB
3
GND
4
RT
5
FB
6
IS
7
VS
8
PWMCMP
9
CP
10
PWMIN
11
ADIM
12
SS
13
FAIL
14
COMPSD
15
PWM2DC
16
PGND
17
N2
18
N1
IN/OUT
IN
IN
IN
OUT
OUT
IN
IN
IN
OUT
IN
IN
OUT
OUT
IN
IN
IN
OUT
OUT
Function
Power Supply Pin for IC (Built-In UVLO Function)
Power ON/OFF Control Pin for IC
Power OFF when STB=L and Power ON when STB=H.
Ground Pin for Internal Signal in IC
Drive Frequency Setting Pin
Basic Frequency is set by the resistor between RT and
GND and Drive Frequency Modulation Range is set by
the resistor between RT and FB.
Error Amplifier Output pin for LED Current feedback and
LED Voltage feedback
Error Amplifier Input pin for LED Current feedback
Error Amplifier Input pin for LED Open Voltage feedback
PWM Comparator Input Pin which controls PWM
operation during brightness adjustment.
N1 and N2 output stop when PWMCMP=L, and they
output Max Duty when PWMCMP=H
Timer Latch Setting Pin
In abnormal case, 1µA (Typ) will be charged to the
capacitor connected to CP, and IC becomes latch status
after output operation stops at CP>2V(Typ)
PWM Signal Input Pin for burst brightness adjustment
DC Signal Input Pin for analog dimming
Soft Start timer and COMPSD timer Setting Pin
During start-up, 2µA (Typ) will be charged to connected
capacitor. At SS>2.0V(typ), COMPSD can start to
detect. At SS>2.5V (typ), CP can accept charge
operation.
Error Indication Signal Output Pin
Normal : L, Error : Open
Abnormal Over Voltage Detection Pin
When detecting abnormality, output operation stops and
IC becomes latch status after 2 clocks.
Pulse to DC converting pin
Pulse Signal is translated to flat dc level by 100kΩ
resistor in IC and the capacitor connected to ADIM.
Power Ground for external MOSFET drive
Output pin for external FET drive circuit (Channel N2)
Output pin for external FET drive circuit (Channel N1)
Rating [V]
-0.3 to +20
-0.3 to +20
-
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +5.5
-0.3 to +20
-
-0.3 to +20
-0.3 to +20
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TSZ02201-0F5F0C100100-1-2
22.Feb.2016 Rev.001