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| 型号： | A8740EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/18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
Features and Benefits
? Ultra small 2 × 2 DFN/MLP-8 package
? Low quiescent current draw (0.5 μ A max. in shutdown mode)
? Primary-side output voltage sensing; no resistor divider required
? Fixed 1.5 A peak current limit
? 1.3 V logic (V HI (min)) compatibility
? Integrated IGBT driver with internal gate resistors
? Optimized for mobile phone, 1-cell Li+ battery applications
? Zero-voltage switching for lower loss
? >75% efficiency
? Charge complete indication
? Integrated 50 V DMOS switch with self-clamping protection
Package: 8-pin DFN/MLP (suffix EE)
Description
The Allegro ? A8740 is a Xenon photoflash charger IC designed
to meet the needs of ultra low power, small form factor cameras,
particularly camera phones. By using primary-side voltage
sensing, the need for a secondary-side resistive voltage divider
is eliminated. This has the additional benefit of reducing
leakage currents on the secondary side of the transformer. To
extend battery life, the A8740 features very low supply current
draw (0.5 μ A max in shutdown mode). The IGBT driver also
has internal gate resistors for minimum external component
count. The charge and trigger voltage logic thresholds are set
at 1.3 V HI (min) to support applications implementing low-
voltage control logic.
The A8740 is available in an 8-contact 2 mm × 2 mm
DFN/MLP package with a 0.60 maximum overall package
height, and an exposed pad for enhanced thermal performance.
It is lead (Pb) free with 100% matte tin leadframe plating.
2 mm × 2 mm, 0.60 mm height
Not to scale
Typical Applications
Battery Input
2.3 to 5.5 V
VBAT
+
C1
COUT
100 ?? F
315 V
Battery Input
1.5 to 5.5 V
VBAT
+
C1
COUT
100 ?? F
315 V
VOUT Detect
SW
VOUT Detect
SW
VIN_VDRV
Control
VIN_VDRV
Control
C2
Block
I SW sense
C2
Block
I SW sense
VPULLUP
VPULLUP
CHARGE
DONE
100 k Ω
CHARGE
DONE
100 k Ω
VIN_VDRV
DONE
VIN_VDRV
DONE
TRIG
IGBT Driver
IGBT Gate
TRIG
IGBT Driver
IGBT Gate
GATE
GND
(A)
Figure 1. Typical applications: (A) with single battery supply and (B) with separate bias supply
8740-DS
GND
(B)
GATE
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A874C | 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: |
| 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: |
| A-874L | 制造商:MA-COM 制造商全称:M/A-COM Technology Solutions, Inc. 功能描述:A-874L 3PST, 335 Amps, 200 VAC, 400 Hz |
| 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: |
| A8759 | 制造商:Bourns Inc 功能描述: |
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