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參數(shù)資料
| 型號(hào)： | R1218N041A |
| 廠商： | Ricoh Co., Ltd. |
| 英文描述： | Step-up DC/DC converter for White LED Backlight |
| 中文描述： | 升壓直流/直流轉(zhuǎn)換器的白光LED背光 |
| 文件頁(yè)數(shù)： | 8/21頁(yè) |
| 文件大小： | 679K |
| 代理商： | R1218N041A |
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R1218x
Selection of Inductors
8
The peak current of the inductor at normal mode can be calculated as next formula:
I
LX
peak
=
1.25
×
I
LED
×
V
OUT
/ V
IN
+
0.5
×
V
IN
×
(V
OUT
V
IN
) / (L
×
V
OUT
×
fosc)
When the start-up or dimming control by CE pin, transient current flows, the peak current must be equal or
less than the current limit of the IC. The peak current should not beyond the rating current of the inductor. For
example, for 4 serial LED drive from V
IN
=
3.6V, recommendation value of the inductor is 22
μ
H or more.
Selection of Capacitors
Set 1
μ
F or more value bypass capacitor C1 between V
IN
pin and GND pin as close as posible.
Set 0.22
μ
F or more capacitor C2 between V
OUT
and GND pin.
TEST CIRCUITS
A
V
IN
CE
GND
V
FB
V
OUT
L
X
R1218x
Series
V
IN
CE
GND
V
FB
V
OUT
L
X
R1218x
Series
OSCILLOSCOPE
Supply Current Test Circuit
UVLO Detector Threshold,
UVLO Released Voltage
V
IN
CE
GND
V
FB
V
OUT
L
X
R1218x
Series
OSCILLOSCOPE
V
IN
CE
GND
V
FB
V
OUT
L
X
R1218x
Series
OSCILLOSCOPE
VFB Voltage, Oscillator Frequency,
Maximum Duty Test Circuit
OVP Detector Threshold,
OVP Released Voltage Test Circuit
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