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參數資料
| 型號： | AIC1647 |
| 廠商： | Analog Integrations Corporation |
| 英文描述： | WHITE LED STEP-UP CONVERTER IN SOT23 |
| 中文描述： | 白光LED升壓型轉換器在SOT23封裝 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 413K |
| 代理商： | AIC1647 |
AIC1647
White LED Step-Up Converter in SOT23
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
DS-1647P-03 010405
z
1.2MHz Fixed Frequency Current-Mode PWM
Operation.
z
Efficiency Up to 84% at V
IN
=4.2V, 3LEDs,
I
LED
=20mA
z
Drives Up to 6LEDs in series
z
Low Supply Current: 70
μ
A
z
Matches LED Current
z
Require Tiny Inductors and Capacitors
z
Tiny SOT23-5 Package
z
Cellular Phones
z
PDAs
z
Digital Still Cameras
z
Handheld Devices
z
White LED Display Backlighting
AIC1647 is a fixed frequency step-up DC/DC
converter designed to drive white LEDs with a
constant current to provide backlight in hand-
held devices. Series connection of the LEDs
provides identical LED currents resulting in
uniform brightness. This configuration eliminates
the need for ballast resistors. Low 95mV
feedback voltage minimizes power loss in the
current setting resistor for better efficiency.
AIC1647 is a step-up PWM converter, which
includes an internal N-channel MOSFET switch
for high efficiency. The high switching frequency,
1.2MHz, allows the use of tiny external
components, saves the layout space and cost.
AIC1647 is available in a space-saving, 5-lead
SOT-23-5 package.
L
6.8
μ
H
D1
SW
VIN
SHDN
FB
GND
AIC1647
3.3~4.2V
R
FB
4.7
C1
1
μ
F
C2
1
μ
F
20mA
L1: 976AS-6R8M, TOKO
D1: RB521S-30, ROHM
C1: JMK107BJ105KA, TAIYO YUDEN
C2: EMK212BJ105KA, TAIYO YUDEN
BZV55-B12
11.8V~12.2V
R1
1K
D2
LED Current (mA)
E
0
5
10
15
20
60
65
70
75
80
85
90
V
IN
=3.6V
V
IN
=4.2V
V
IN
=3.0V
3 LEDs, 6.8
μ
H
L1: 976AS-6R8M, TOKO
D1: RB521S-30, ROHM
Fig. 1 Li-Ion Powered Driver with Over Voltage Protection for Three White LEDs
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
1
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| AIC1647PVBG | 制造商:AIC 制造商全稱:Analog Intergrations Corporation 功能描述:WHITE LED STEP-UP CONVERTER IN SOT23 |
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