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参数资料
| 型号： | A8436EEJTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC PHOTOFLASH CHARGER 10-MLP |
| 标准包装： | 1 |
| 应用： | 照相机闪光灯电容器充电器 |
| 电流 - 电源： | 1.3mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN/MLP（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1098-6 |
A8436
Adjusting Output Voltage
Photoflash Capacitor Charger with IGBT Driver
internal MOSFET switch is closed, and the primary-side current
The A8436 senses output voltage during switch off-time. This
starts to ramp-up. It can be calculated as:
allows the voltage divider network, R1 through R3 (see figure
6), to be connected at the anode of the high voltage output diode,
V D_ Peak = V OUT + N × V BATT .
(5)
D1, eliminating power loss due to the feedback network when
charging is complete. The output voltage can be adjusted by
The peak current of the rectifying diode, ID_Peak, is calculated as :
selecting proper values of the voltage divider resistors. Use the
following equation to calculate values for Rx ( Ω ):
I D_ Peak = I Primary_Peak / N .
(6)
= OUT ? 1 .
R 1 + R 2
R 3
V
V FB
(4)
Input Capacitor Selection
Ceramic capacitors with X5R or X7R dielectrics are recom-
R1 and R2 together need to have a breakdown voltage of at
least 300 V. A typical 1206 surface mount resistor has a 150 V
breakdown voltage rating. It is recommended that R1 and R2
have similar values to ensure an even voltage stress between
them. Recommended values are:
R1 = R2 = 150 k Ω (1206)
R3 = 1.2 k Ω (0603)
which together yield a stop voltage of 303 V.
Using higher resistance values for R1, R2, and R3 does not offer
significant efficiency improvement, because the power loss of
the feedback network occurs mainly during switch off-time, and
because the off-time is only a small fraction of each charging
cycle.
Output Diode Selection
Choose the rectifying diode(s), D1, to have small parasitic
capacitance (short reverse recovery time) while satisfying the
reverse voltage and forward current requirements.
The peak reverse voltage of the diode, V D_Peak , occurs when the
Recommended Components Table
mended for the input capacitor, C2. It should be rated at least
4.7 μ F / 6.3 V to decouple the battery input, V BATT , at the primary
of the transformer. When using a separate bias, V BIAS , for the
A8436 VIN supply, connect at least a 0.1 μ F / 6.3 V bypass
capacitor to the VIN pin.
Layout Guidelines
Key to a good layout for the photoflash capacitor charger circuit
is to keep the parasitics minimized on the power switch loop
(transformer primary side) and the rectifier loop (secondary side).
Use short, thick traces for connections to the transformer primary
and SW pin.
Output voltage sensing circuit elements must be kept away from
switching nodes such as SW pin. Make sure that there is no GND
plane underneath R1 and R2, because parasitic capacitance to
ground will affect sensing accuracy. It is important that the ˉDˉ ˉOˉ
ˉNˉ ˉEˉ signal trace be routed away from the transformer and other
switching traces, in order to minimize noise pickup. In addition,
high voltage isolation rules must be followed carefully to avoid
breakdown failure of the circuit board.
Component Rating
Part Number
Source
C1 Input Capacitor
C2 Input Capacitor
0.1 μ F, ± 10%, 16 V X7R ceramic
capacitor (0603)
4.7 μ F, ± 10%, 10 V, X5R ceramic
capacitor (0805)
GRM188R71C104KA01D
LMK212BJ475KG
Murata
Taiyo Yuden
COUT Photoflash Capacitor 330 V, 100 μ F (or 19 to 180 μ F)
EPH-331ELL101B131S
Chemi-Con
D1 Output Diode
R1 and R2 FB Resistors
R3 FB Resistors
T1 Transformer
2 x 250 V, 225 mA, 5 pF
2 x 300 V, 225 mA, 5 pF
150 k Ω , 1 / 4 W ± 1% (1206)
1.20 k Ω 1 / 10 W ± 1% (0603)
1:10.2, L Primary = 14.5 μ H
1:10.2, L Primary = 12 μ H
1:10, L Primary = 10.8 μ H
1:10.2, L Primary = 9.8 μ H
BAV23S
GSD2004S
9C12063A1503FKHFT
9T06031A1201FBHFT
LDT565630T-002
T-16-024A
ST-532517A
SBL-5.6-1
Philips Semiconductor,
Fairchild Semiconductor
Vishay
Yageo
Yageo
TDK
Tokyo Coil Engineering
Asatech
Kijima-Musen
Allegro MicroSystems, Inc.
115 Northeast Cutoff
13
Worcester, Massachusetts 01615-0036 U.S.A.
1 . 508.853.5000; www.allegromicro.com
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