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PDF BD9412F Data sheet ( Hoja de datos )
| Número de pieza | BD9412F | |
| Descripción | White LED Driver | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
PFC Direct current resonance type
White LED Driver for Large LCD
BD9412F
General Description
BD9412F is a current resonance type LED Driver with
frequency-controlled LED current. It can connect to PFC
directly and can use half-bridge structure reducing the
number of external components.
It incorporates some protection functions against fault
conditions such as Over-Voltage Protection, LED Short
Detection (IS High Detection) and LED Open Detection
(IS Low Detection).
Features
20V High Rating Process
1 Channel Push-pull Control
Current and Voltage Feedback by Driving
Frequency
Adjustable Soft Start
Adjustable Timer Latch
Under-Voltage Detection for IC’s Power Line
Output Over-Voltage Protection
Output Error Signal from FAIL Terminal
Shift to Save Mode by STB Terminal
Burst Control by External PWM Signal
Analog Dimming by External DC Signal
Conversion Function from Pulse to DC
Key Specifications
Operating Power Supply Voltage Range:
9.0V to 18.0V
Oscillator Frequency:
Operating Current:
60kHz (RRT=100kΩ)
2.3mA (Typ)
Operating Temperature Range: -40°C to +85°C
Package
SOP18
W(Typ) x D(Typ) x H(Max)
11.20mm x 7.80mm x 2.01mm
Pin pitch 1.27mm
Applications
TV, Computer Display, LCD Backlighting.
Figure. 1 SOP18
Typical Application Circuit
VCC
GND
PDIM
STB
PWM
GND
ERR
VCC
PDIM
ON/OFF
PWMIN
FAIL
< Primary Side >
PVIN
GND
T1
PDIM
FAIL
5V
VCC
ON/OFF
PWMIN
BD9412F
< Secondary Side >
Figure. 2 Typical Application Circuit(s)
〇Product structure : Silicon monolithic integrated circuit
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 14 • 001
〇This product has no designed protection against radioactive rays
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TSZ02201-0F5F0C100070-1-2
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1 page  
BD9412F
Electrical Characteristics – continued (Unless otherwise specified Ta=25°C, VCC= 12V)
Parameter
Symbol
Limit
Min Typ
Min Unit
【Output Block】
N1 Output Sink Resistance
N1Output Source Resistance
N2 Output Sink Resistance
N2 Output Source Resistance
MAX DUTY
RN1SI
RN1SO
RN2SI
RN2SO
MAX DUTY
1.5
4.5
1.5
4.5
43.0
3.0 6.0 Ω
9.0 18.0 Ω
3.0 6.0 Ω
9.0 18.0 Ω
45.0 47.0 %
N1-N2,N2-N1Dead Time
Output Frequency
【Timer Block】
tOFF 100 200 400 ns
fOUT 57.9 60.0 62.1 kHz
Setting Voltage for CP Time
Setting Current for CP Time
【ADIM Block】
VCP 1.90 2.00 2.10 V
ICP 0.85 1.00 1.15 µA
ADIM Pin Inflow Current 1
IADIM1 -5 0 +5 µA
ADIM Pin Inflow Current 2
PWM2DC Pin Inflow Current
PWM2DC Pin High Voltage
PWM2DC Pin Low Voltage
PWM2DC Pin Selected Voltage to
High Impedance
【COMPSD Block】
COMPSD Detection Voltage
【FAIL Block】
FAIL Pin ON-Resistance
IADIM2
IPWM2DC
VPWM2DCH
VPWM2DCL
VPWM2DCZ
VCOMPSD
RFAIL
19
4
1.8
-0.3
7.5
3.88
-
28 37 µA
6 8 µA
- 5.0 V
-
+0.8
V
8.0 8.5 V
4.00 4.12 V
100 200 Ω
Conditions
fOUT=60kHz
RRT=100kΩ
VADIM=2.2V,
VPWM2DC=12V
VADIM=5V,
VPWM2DC=12V
VPWM2DC=3V
PWM2DC=sweep up
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
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TSZ02201-0F5F0C100070-1-2
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5 Page 
BD9412F
PIN.5 FB
This is output pin for LED current feedback (IS pin) error amplifier and open LED voltage feedback (VS pin) error
amplifier. The capacitance between FB and IS (1500pF to 0.01µF) also determines start up time of LED current
necessary during phase compensation and brightness adjustment. Capacitance between FB and VS (1500pF to
0.01µF) is for phase compensation of error amplifier.
Moduration width of Output Frequency
150
125
108.1
100
75
50
25 Figure. xx
As shown by left graph, by changing resistor RADJ
between RB and RT, it is possible to determine the
modulation width of frequency.
Modulation width of frequency determined by the
resistor between RB and RT resistor (Theoretical
formula : Example)
When RADJ=100kΩ , Δ fOUT=108.1kHz
0
10 100
Figure. 13 出力周波数R変AD動J Re幅sistan対ce : RRADAJ D[kJΩ]抵抗値 特性
1000
Figure. 13 Modulation width of Output Frequency vs RADJ Resistance
200
180
160
140
120
100
80
60
40
20 0.5
0
0
1
Output Frequency vs FB Voltage
167.8
Modulation width of frequency determined by the
resistor between RB and RT resistor (Theoretical
formula : Example)
When RADJ=100kΩ , Δ fOUT=108.1kHz
59.7
3.2
23456
FB Voltage : VFB [V]
Figure. 14 Output Frequency vs FB Voltage
The basic drive frequency is determined by resistor RRT which is connected from RT pin to GND. The basic
frequency is the one at VFB=1.5V, and operation frequency range will be fixed with frequency modulation width that
is determined by RADJ under this condition. When RRT=51kΩ, fOUT=127.7kHz becomes to basic drive frequency.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
11/24
TSZ02201-0F5F0C100070-1-2
12.Aug.2015 Rev.002
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet BD9412F.PDF ] | |
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