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参数资料
| 型号： | L296HT |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PZFM15 |
| 封装： | PLASTIC, POWER PACK-15 |
| 文件页数： | 11/22页 |
| 文件大小： | 285K |
| 代理商： | L296HT |
Figure 43 : 5.1V/2A Power Supply using External
Limiting Current Resistor and Crow-
bar Protection on the Supply Voltage
(L296P only)
SOFT-START AND REPETITIVE POWER-ON
When the device is repetitivelypowered-on,the soft-
start capacitor, CSS, must be discharged rapidly to
ensurethat each start is ”soft”. This can be achieved
economicallyusing the reset circuit, as shownin Fig-
ure 44.
In this circuit the divider R1, R2 connectedto pin 12
determines the minimum supply voltage, below
which the open collector transistor at the pin 14 out-
put discharges CSS.
Figure 44
Figure 45
Figure 46
The approximate discharge times obtainedwith this
circuit are :
CSS (
F)
tDIS (
s)
2.2
4.7
10
200
300
600
If thesetimes are still too long,an externalPNPtran-
sistor may be added, as shown in Figure 45 ; with
this circuit discharge times of a few microseconds
may be obtained.
HOW TO OBTAIN BOTH RESET AND
POWER FAIL
Figure 46 illustrateshowit is possibleto obtainat the
same time both the power fail and reset functions
simply by adding one diode(D) and one resistor (R).
In this case the Reset delay time (pin 13) can only
start when the output voltage is VO
≥ VREF - 100mV
and the voltage accross R2 is higher than 4.5V.
With the hysteresis resistor it is possible to fix the in-
put pin 12 hysteresis in order to increase immunity
to the 100Hz ripple present on the supply voltage.
Moreover, the power fail and reset delay time are
automatically locked to the soft-start. Soft-start and
delayed reset are thus two sequential functions.
The hysteresis resistor should be In the range of
aboit 100k
and the pull-up resistor of 1 to 2.2k.
L296 - L296P
19/22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L296P | 功能描述:直流/直流开关调节器 5.1 to 40V Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L296P | 制造商:STMicroelectronics 功能描述:DC/DC Converter IC |
| L296PHT | 功能描述:直流/直流开关调节器 5.1 to 40V Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| L297 | 制造商:Panasonic Industrial Company 功能描述:INTEGRATED CIRC |
| L297/1 | 功能描述:马达/运动/点火控制器和驱动器 Stepper Motor RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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