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| 型号： | A8436EEJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CHARGER 10-MLP |
| 标准包装： | 1 |
| 应用： | 照相机闪光灯电容器充电器 |
| 电流 - 电源： | 1.3mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN/MLP（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1098-6 |
A8436
Photoflash Capacitor Charger with IGBT Driver
(1)
To understand the Timer mode, it is noted that the secondary
winding charge current, I Secondary , decreases linearly at a rate of:
dI Secondary V OUT
=
dt L Primary N 2
where :
I Secondary is the secondary side current,
L Primary is the primary side inductance, and
N is the transformer turns ratio ( N Secondary / N Primary ).
As shown in the three panels of figure 4, when the A8436 charges
a fully-discharged photoflash capacitor, I Secondary decreases very
slowly due to the low initial V OUT . The A8436 internal timer
(Timer mode) sets a maximum timeframe of 18 μ s for the off-
time as long as the SW node voltage is greater than 1.2 V. When
Lower input current offers the advantage of a longer battery
lifetime. For faster charging time, however, use the highest
current limit.
I SWLIM may be adjusted during charging. Figure 5 shows a
waveform of I SWLIM being adjusted during charging. I SWLIM is
lowered from 1.4 to 1.2 A, and charging slows slightly at the
lower current level.
I SWLIM = 1.4 A
I SWLIM = 1.2 A
the off-time passes 18 μ s, the internal MOSFET switch is turned
on, initiating the next charging cycle .
I IN(Avg)
Input Current Limiting
The peak input current, I SWLIM , can be set to three levels by
configuring the ILIM pin:
V OUT
I SWLIM Setting
(A)
1.0
1.2
ILIM Pin
Connection
External ground
Float
1.4
Pull up to IC supply voltage
with a 1 to 10 k Ω resistor
Figure 5. Reducing I SWLIM during charging
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1 . 508.853.5000; www.allegromicro.com
11
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相关代理商/技术参数 |
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| A8437 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Mobile Phone Xenon Photoflash Capacitor Charger |
| A84377-000 | 制造商:TE Connectivity 功能描述:TXR66SJ00-3616BI - Bulk |
| A8437ECGLT | 功能描述:IC PHOTOFLASH CAP CHARGER WLCSP 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 |
| A8437EEJTR-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 |
| A8438 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
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