A8739

更新时间： 2024-11-12 12:51:19

品牌	Logo	应用领域
急速微 - ALLEGRO		闪光灯
页数	文件大小	规格书
21页	569K
描述
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.

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A8739 数据手册

A8739

Ultra-Small Mobile Adjustable Xenon Photoflash

Capacitor Charger with IGBT Driver

Features and Benefits

Description

▪ 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

TheAllegro^®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 –5Veach) using an external resistor.This enables better

output accuracy, as well as greater flexibility in the selection of

transformers.

▪ Ultra-small 2 × 2 DFN/MLP-8 package

▪ Integrated IGBT driver with internal gate resistors

▪ Low quiescent current draw (0.5 μA 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

To extend battery life, the A8739 features very low supply

current draw (0.5 μA max in shutdown mode and 10 μA 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.

Package: 8-pin DFN/MLP (suffix EE)

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, andanexposedpadforenhancedthermalperformance.

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

Battery Input

2.0 to 5.5 V

R_BAT

COUT

100F

315 V

100F

VBAT

315 V

VOUT Detect

VIN_VDRV

2.3 to 5.5 V

VIN_VDRV

Control

Block

Control

Block

_SWsense

I_SWsense

VPULLUP

100 kΩ

CHARGE

DONE

IN_VDRV

IGBT Driver

TRIG

IGBT Gate

GATE

IGBT Gate

GATE

GND

(A)

(B)

Figure 1. Typical applications: (A) with single battery supply and (B) with separate bias supply

8739-DS

12 3 4 5 6 7...21

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与A8739相关器件

型号	品牌	获取价格	描述	数据表
A8739EEETR-T	ALLEGRO	获取价格	The Allegro A8739 is a Xenon photoflash charger IC designed to provide an ultra-small solu
A8740EEETR-T	ALLEGRO	获取价格	Analog Circuit, 1 Func, PDSO8, 2 X 2 MM, 0.60 MM HEIGHT, LEAD FREE, MO-229UCCD, DFN-8
A-874L	TE	获取价格	A-874L 3PST, 335 Amps, 200 VAC, 400 Hz
A-876M	TE	获取价格	A-876M SPDT N.C., 300 Amps, 28 VDC
A87878-000	LITTELFUSE	获取价格	PTC Resettable Fuse, Through Hole Mount, RADIAL LEADED, ROHS COMPLIANT
A8796BH	INTEL	获取价格	Microcontroller, 16-Bit, UVPROM, 8096 CPU, 12MHz, CMOS, CPGA68
A8797BH	ETC	获取价格	16-Bit Microcontroller
A879AY-100M	TOKO	获取价格	Fixed Inductors for Surface Mounting
A879AY-100M=P3	TOKO	获取价格	General Purpose Inductor, 10uH, 20%, 1 Element, SMD
A879AY-101K	TOKO	获取价格	Fixed Inductors for Surface Mounting

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