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參數(shù)資料
| 型號： | BD6155FVM |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | DC/DC converter for LCD back light |
| 中文描述： | 直流/直流轉(zhuǎn)換器，用于LCD背光 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 111K |
| 代理商： | BD6155FVM |
BD6155FVM
Communication ICs
4/7
!
Circuit operation
1) Charge pump driver
Charge pump is consisted capacitor pin (pin7), external schotky diodes and capacitors.
Output voltage at no loading is 2VBAT-2VF. (VF is as same as schotky’s VF )
Output voltage at loading is referred Fig2. As standard example, however it depends on external components.
VBAT
Shotky diodes
RB521-S30
Charge pump output
LED
1
μ
F
C (Pin7)
1
μ
F
20
40
0
60
80
100
15
3
0
6
9
12
O
OUTPUT LOAD : (mA)
Fig.2 Charge pump loading characteristics
(Typical operating characteristics)
VBAT=2.9V
VBAT=3.6V
VBAT=5.5V
2) Fixed current driver
LED driver fixed current is determined by resistor value between LEDS pin (pin4) and GND.
At current control set up voltage1 (Current1, 2=High) resistor value between LEDS-GND is set as 2.7
.
205mV
÷
2.7
= 75.9mA (2 expressions)
The above current is loaded to LED as fixied current.
LED
LED (5Pin)
+
LEDS (4Pin)
RSENSE
CURRENT1
CURRENT2
LED drive current fix example
LEDS pin voltage
(mV)
LED drive current (mA)
RSENSE=2.7
RSENSE=5.1
105.0
38.9
20.6
Current control setup voltage 1 (Current 1=High Current 2=High)
Current control setup voltage 2 (Current 1=Low Current 2=High)
Current control setup voltage 3 (Current 1=High Current 2=Low)
Current control setup voltage 4 (Current 1=Low Current 2=Low)
205.0
40.2
75.9
57.4
155.0
30.4
55.0
10.8
20.4
The less RSENSE, the bigger fixed current for LED drive.
Resistors value should be determined with confirmation of charge pump loading characteristics (Fig.2) and LED's I-V characteristics.
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