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| 型号： | A8739EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CHARGER 8-DFN |
| 标准包装： | 1 |
| 应用： | 照相机闪光灯电容器充电器，Xenon |
| 电流 - 电源： | 2mA |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-UFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（2x2） |
| 包装： | 标准包装 |
| 其它名称： | 620-1365-6 |
A8739
Ultra-Small Mobile Adjustable Xenon Photoflash
Capacitor Charger with IGBT Driver
ILIM Programming
The peak current limit can be programmed to sixteen differ-
ent levels, from 100% to 29%, with programming through the
CHARGE pin. An internal digital circuit decodes the input
clock signals, which sets the switch current limit. This flexible
scheme allows the user to operate the A8739 at required current
limits. The battery life can be effectively extended by setting a
lower current limit at low battery voltages. Figure 6 shows the
ILIM clock timing scheme protocol. The total ILIM setup time,
t ILIM(SU) , denotes the time needed for the decoder circuit to
receive ILIM inputs and set I SWLIM , and has a typical duration of
200 μ s.
Figure 7 shows the timing definition of the primary current
(0 to 15)
Figure 6. ILIM programming timing definition
limiting circuit. At the end of the setup period, t ILIM(SU) , primary
current starts to ramp up to the set I SWLIM . The I SWLIM setting
remains in effect as long as the CHARGE pin is high. To reset the
ILIM decoder, pull the CHARGE pin low before clocking-in the
new setting.
After the first start-up or an ILIM decoder reset, each new current
limit can be set by sending a burst of pulses to the CHARGE
pin. The first rising edge starts the ILIM decoder, and up to 16
rising edges will be counted to set the ISWLIM level. The first
pulse width, t ILIM1(H) , must be at least 15 μ s long. Subsequent
pulses (up to 15 more) can be as short as 0.2 μ s. The last low-
to-high edge must arrive within 200 μ s from the first edge. The
CHARGE pin will stay high afterwards.
Figure 7. Current limit timing example (I SWLIM4 selected)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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| A874L | 功能描述:通用继电器 CONTACTOR 3 PST RoHS:否 制造商:Omron Electronics 触点形式:1 Form A (SPST-NO) 触点电流额定值:150 A 线圈电压:24 VDC 线圈电阻:144 Ohms 线圈电流:167 mA 切换电压:400 V 安装风格:Chassis 触点材料: |
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| A874WA1 | 功能描述:通用继电器 RELAY RoHS:否 制造商:Omron Electronics 触点形式:1 Form A (SPST-NO) 触点电流额定值:150 A 线圈电压:24 VDC 线圈电阻:144 Ohms 线圈电流:167 mA 切换电压:400 V 安装风格:Chassis 触点材料: |
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