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| 型号： | A8739EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 2/23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
Features and Benefits
? Primary-side output voltage sensing; no resistor divider required
? Adjustable switch peak current limit up to 1.5 A with
single-wire programming through the CHARGE pin
? Option to fine-tune target voltage
? Ultra-small 2 × 2 DFN/MLP-8 package
? Integrated IGBT driver with internal gate resistors
? Low quiescent current draw (0.5 μ A max. in shutdown mode)
? 1V logic (V HI (min)) compatibility
? Zero-voltage switching for lower loss
? >75% efficiency
? Charge complete indication
? Integrated 50 V DMOS switch
Package: 8-pin DFN/MLP (suffix EE)
2 mm × 2 mm, 0.60 mm height
Not to scale
Description
The Allegro ? A8739 is a Xenon photoflash charger IC designed
to provide an ultra-small solution with flexibility to adjust
both charging current limit and output voltage target. 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. Target output voltage is primarily determined
by the transformer turns ratio, but it can be further adjusted (in
steps of –5 V each) using an external resistor. This enables better
output accuracy, as well as greater flexibility in the selection of
transformers.
To extend battery life, the A8739 features very low supply
current draw (0.5 μ A max in shutdown mode and 10 μ A in
standby mode). The switch current limit can be programmed
from 0.45 to 1.5 A in 16 steps with single wire interface,
through the CHARGE pin.
The IGBT driver also has internal gate resistors for minimum
external component count. The charge and trigger voltage
logic thresholds are set at 1 V HI (min) to support applications
implementing low-voltage control logic.
The A8739 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.
Typical Applications
Battery Input
2.3 to 5.5 V
+
Battery Input
2.0 to 5.5 V
+
R BAT
VBAT
C1
COUT
100 ?? F
315 V
R BAT
VBAT
C1
COUT
100 ?? F
315 V
VOUT Detect
SW
VOUT Detect
SW
VIN_VDRV
C2
Control
Block
I SW sense
VIN_VDRV
2.3 to 5.5 V
C2
Control
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
GATE
GND
(A)
GND
(B)
Figure 1. Typical applications: (A) with single battery supply and (B) with separate bias supply
8739-DS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| A8740EEETR-T | 功能描述:IC PHOTOFLASH CAP CHARGER 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| 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: |
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