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参数资料
| 型号： | A8437ECGLT |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CAP CHARGER WLCSP |
| 标准包装： | 24,000 |
| 应用： | 照相机闪光灯电容器充电器，Xenon |
| 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： | 12-UFBGA，WLCSP |
| 供应商设备封装： | 12-WLCSP |
| 包装： | 带卷 (TR) |
A8437
Mobile Phone Xenon Photoflash Capacitor Charger
with IGBT Driver
by selecting the value of an external resistor RSET,
connected from the ISET pin to GND, which deter-
mines the ISET bias current, and therefore the switch-
ing current limit, I SWlim .
To the first order approximation, I SWlim is related to
I SET and R SET according to the following equations:
where:
R SET(INT) is the internal resistance of the I SET pin
(1 k Ω typical),
R GND(INT) is the internal resistance of the bonding
wire for the GND pin (27 m Ω typical), and
I SWlim = I SET × K = V SET / R SET × K ,
where K = 28000 when battery voltage is 3.6 V.
(3)
K = (K ′ + V IN × K ″ ), with K ′ = 24350 and K ″ ≈
1040 at T A = 25°C. Then,
In real applications, the actual switching current
I SWlim = I SET × K + V BAT / L P × t D ,
(5)
limit is affected by input battery voltage, and also the
transformer primary inductance, Lp. If necessary, the
following expressions can be used to determine I SWlim
more accurately:
I SET = V SET / ( R SET + R SET(INT) – K × R GND(INT) ), (4)
where t D is the delay in SW turn-off (0.1 μ s typical).
The chart at the bottom of the page can be used to
determine the relationship between R SET and I SWlim at
various battery voltages.
Peak Current Limit versus ISET Resistance
V IN = V BAT , XFM Lp = 8 μ H, T A =25°C
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
V IN = 5.5 V
V IN = 4.5 V
V IN = 3.6 V
V IN = 3.0 V
V IN = 2.3 V
25
30
35
40
45
50
55
60
65
70
75
80
85
90
R SET (k Ω )
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
10
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相关代理商/技术参数 |
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| A8437EEJTR-T | 功能描述:IC PHOTOFLASH CAP CHARGER 10TDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压: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:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| A8438 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438_06 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438_13 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Photoflash Capacitor Charger with IGBT Driver |
| A8438EEJTR-T | 功能描述:IC PHOTOFLASH CHARGER 10-MLP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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