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| 型号： | A8735EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/17页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CAP CHARGER 8DFN |
| 标准包装： | 1 |
| 应用： | 照相机闪光灯电容器充电器，Xenon |
| 电流 - 电源： | 50µA |
| 电源电压： | 1.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN/MLP（2x2） |
| 包装： | 标准包装 |
| 其它名称： | 620-1339-6 |
A8735
Ultra Small Mobile Phone Xenon Photoflash
Capacitor Charger with IGBT Driver
Effects of Input Filters
Input Capacitor Selection
Ceramic capacitors with X5R or X7R dielectrics are recom-
mended for the input capacitor, C IN . During initial Timer mode
the device operates with 18 μ s off-time. The resonant period
V OUT
V BAT
caused by input filter inductor and capacitor should be at least
2 times greater or smaller than the 18 μ s Timer period, to reduce
input ripple current during this period. The typical input LC filter
is shown in figure 7.
The resonant period is given by:
C2
C3
C1
I BAT
T res = 2
( L × C IN ) 1/2 .
Figure 8. Input current waveforms with Li+ battery connected by
The effects of input filter components are shown in figures 8, 9,
and 10. It is recommended to use at least 10 μ F / 6.3 V to decou-
ple the battery input, VBAT , at the primary of the transformer.
Decouple the VIN pin using 0.1 μ F / 6.3 V bypass
capacitor.
Output Diode Selection
5-in. wire and decoupled by 4.7 μ F capacitor, C OUT = 100 μ F,
V IN = V BAT = 3.6 V, Ch1: V OUT = 50 V/div, Ch2: V BAT = 2 V/div,
Ch3: I BAT = 500 mA/div, t = 1 s/div
V OUT
V BAT
Choose rectifying diodes, D1, to have small parasitic capacitance
(short reverse recovery time) while satisfying the reverse voltage
and forward current requirements. The peak reverse voltage of
C2
C3
I BAT
the diodes, V DPeak , occurs when the internal MOSFET switch is
closed. It can be calculated as:
V DPeak = V OUT + N × V BAT .
The peak current of the rectifying diode, I DPeak , is calculated as:
I DPeak = I PRIMARY_Peak / N .
LIN
C1
Figure 9. Input current waveforms with Li+ battery connected through
4.7 μ H inductor and 4.7 μ F capacitor, C OUT = 100 μ F, V IN = V BAT = 3.6 V,
Ch1: V OUT = 50 V/div, Ch2: V BAT = 2 V/div, Ch3: I BAT = 200 mA/div,
t = 1 s/div
V OUT
V BAT
+
VBAT
CIN
A8735
C2
C3
I BAT
C1
Figure 7. Typical input section with input inductance (inductance, L IN , may
be an input filter inductor or inductance due to long wires in test setup)
Figure 10. Input current waveforms with Li+ battery connected through
4.7 μ H inductor and 10 μ F capacitor, C OUT = 100 μ F, V IN = V BAT = 3.6 V,
Ch1: V OUT = 50 V/div, Ch2: V BAT = 2 V/div, Ch3: I BAT = 200 mA/div,
t = 1 s/div
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
13
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| A8738EEJTR-T | 功能描述:IC PHOTOFLASH CAP CHARGER 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
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