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参数资料
| 型号： | A8740EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CAP CHARGER 8DFN |
| 标准包装： | 24,000 |
| 拓扑： | 交直流离线开关，反激式，PFC |
| 输出数： | 1 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 闪灯/白光 |
| 电源电压： | 1.5 V ~ 5.5 V |
| 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-EP（2x2） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
A8740
Ultra Small Mobile Phone Xenon Photoflash
Capacitor Charger with IGBT Driver
As soon as a sufficient voltage has built up at the output capaci-
tor, the IC enters Fast-Charging mode. In this mode, the next
switching cycle starts after the secondary side current has stopped
flowing, and the switch voltage has dropped to a minimum value.
A proprietary circuit is used to allow minimum-voltage switch-
ing, even if the SW pin voltage does not drop to 0 V. This enables
Fast-Charging mode to start earlier, thereby reducing the overall
charging time. Minimum-voltage switching is shown in figure 4.
During Fast-Charging mode, when V OUT is high enough (over
50 V), true zero-voltage switching (ZVS) is achieved. This
further improves efficiency as well as reduces switching noise. A
ZVS interval is shown in figure 5.
C4
I SW
C4
I SW
C2,C3
V SW
V BAT
C2,C3
V SW
V BAT
V OUT
V OUT
C1
Figure 4. Minimum-voltage switching: V OUT ≥ 35 V, V BAT = 5.5 V,
Ch1: V OUT = 20 V / div., Ch2: V BAT = 5 V / div., Ch3: V SW = 5 V / div.,
Ch4: I SW = 750 mA / div., t = 1 μ s / div.
C1
Figure 5. True zero-voltage switching (ZVS): V OUT = 75 V, V BAT = 5.5 V,
Ch1: V OUT = 20 V / div., Ch2: V BAT = 5 V / div., Ch3: V SW = 5 V / div.,
Ch4: I SW = 750 mA / div., t = 0.5 μ s / div.
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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