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| 型号： | A8739EEETR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 17/23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
Output Voltage Adjustment
The target output voltage of the A8739 is primarily determined
by the transformer turns ratio, N:
V OUT = 31.5 (V) × N
Typically N = 10, so the output voltage is approximately 315 V.
This output voltage can be further programmed in 5 V decre-
ments down to 295 V, by using an external resistor at the VBAT
pin. This enables fine-tuning to achieve better accuracy, and pro-
vides greater flexibility in the selection of transformers. Refer to
figure 8 for example: An external resistor R BAT = 2.32 k Ω is used
to set the target output voltage at two steps lower, or 305 V when
the transformer turns ratio = 10. Capacitor C3 is needed in case
excessive switching noises is coupled into the VBAT pin, which
may affect accuracy of target voltage.
The relationship of output voltage and VBAT resistance is shown
in figure 9. To ensure proper voltage selection, use only
1% resistors. If C3 is used, make sure the RC filter time constant
(R BAT × C3) is less than 1 μ s approximately.
Output Voltage versus VBAT Resistance
Transformer turns ratio N = 10
320
315
V P = Power Supply
2.0 to 5.5 V
1:N
(N = 9 -11)
310
C3
100 pF
R BAT
2.32 k Ω
C1
COUT
100 ?? F
Bias Input
2.3 to 5.5 V
A8739
VBAT
V SW
SW
330 V
305
VIN_VDRV
C2
Control
Block
I SW sense
300
DONE
VPULLUP
295
CHARGE
DONE
100 k Ω
290
VIN_VDRV
0
1
2
3
4 5 6
Resistance (k Ω )
7
8
9
10
TRIG
IGBT Driver
GND
IGBT Gate
GATE
Resistance,
R BAT
(k Ω )
0 to 0.10
Output Voltage,
V OUT
(V)
31.5 × N
Recommended 1%
Resistor Values
(k Ω )
0 .
Recommended
C3 capacitance
(pF)
Optional
0.65 to 1.03
2.15 to 2.49
4.58 to 5.08
8.68 to 9.76
31.0 × N
30.5 × N
30.0 × N
29.5 × N
0.845
2.32
4.87
9.09
100
100
100
47
Figure 8. Adjustment of V OUT using a series resistor at the VBAT pin
(V OUT = 30.5 × N).
Figure 9. Relationship of V OUT and a series resistor at the VBAT pin
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
16
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| 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: |
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| 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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