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参数资料
| 型号： | PT5507A |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5 A SWITCHING REGULATOR, 350 kHz SWITCHING FREQ-MAX, SMA5 |
| 封装： | SIP-5 |
| 文件页数： | 6/9页 |
| 文件大小： | 178K |
| 代理商： | PT5507A |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
PT5500/5520 Series
Using the Inhibit Control on the PT5500/PT5520
Series of Excalibur
Step-Down ISRs
For applications requiring output voltage On/Off control,
both the PT5500 and PT5520 series of power modules
incorporate an inhibit function. This function can be used
for power-up sequencing or wherever there is a require-
ment for the module to be switched off. The On/Off
function is provided by the Inhibit (pin 1) control.
The ISR functions normally with Pin 1 open-circuit,
providing a regulated output whenever a valid source
voltage is applied to Vin, (pin 2). When a low-level2
ground signal is applied to pin 1, the regulator output
will be disabled.
Figure 1 shows an application schematic, which details
the typical use of the Inhibit function. Note the discrete
transistor (Q1). The Inhibit control has its own internal
pull-up to +Vin potential. An open-collector or open-
drain device is required to control this pin.
The Inhibit pin control thresholds are given in Table 1.
Equation 1 may be used to determine the approximate
current drawn from the input source, and by Q1 when the
regulator is in the inhibit state.
Table 1; Inhibit Control Requirements
Parameter
Min
Max
Enable (VIH)Vin – 0.5
Open
Disable (VIL)
–0.2V+0.5V
Equation 1
Iinh
=Vin ÷ 10k
± 20%
Notes:
1. Use an open-collector device (preferably a discrete
transistor) for the Inhibit input. A pull-up resistor is not
necessary. To disable the output voltage, the control pin
should be pulled low to less than +0.5VDC.
2. Do not control the Inhibit input with an external DC
voltage. This will lead to erratic operation of the ISR and
may over-stress the regulator.
5. Avoid capacitance greater than 500pF at the Inhibit
control pin. Excessive capacitance at this pin will cause
the ISR to produce a pulse on the output voltage bus at
turn-on.
6. Keep the On/Off transition to less than 10s. This
prevents erratic operation of the ISR, which could cause a
momentary high output voltage.
Figure 1
Turn-On Time:
In the circuit of Figure 1, turning Q1 on applies
a low-voltage to the Inhibit control (pin 1) and disables the
regulator output. Correspondingly, turning Q1 off allows the
Inhibit control pin to be pulled high by its internal pull-up
resistor. The ISR produces a fully regulated output voltage
within 10-msec of the release of the Inhibit control pin. The
actual turn-on time will vary with input voltage, output
load, and the total amount of load capacitance. Figure 2
shows the typical rise in both output voltage and input
current for a PT5502 (2.5V) following the turn-off of Q1 at
time t =0. The waveform was measured with a 5Vdc input
voltage, and 2.5A resistive load.
Figure 2
C2
100
F
+
C1, 1
F
(Optional)
+V
O
COM
+V
IN
COM
Inhibit
Q1
BSS138
PT5502
2
13
4
Vin
V o
GND
INH
-1
0
1
23
456
78
t (milli-secs)
Vo (1V / Div)
IIN (1A / Div)
VINH (5V / Div)
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| PT5507C | 功能描述:开关变换器、稳压器与控制器 ADJ STEP-DOWN ISR RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| PT5507N | 功能描述:REG 1.0V 3A 3.3/5VIN ADJ VRT RoHS:否 类别:电源 - 板载 >> DC DC Converters 系列:PT5500 设计资源:Maxi/Mini/Micro Design Guide, Appl Manual 标准包装:1 系列:Maxi 类型:隔离 输出数:1 电压 - 输入（最小）:43V 电压 - 输入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 电流 - 输出（最大）:* 电源（瓦） - 制造商系列:400W 电压 - 隔离:* 特点:* 安装类型:通孔 封装/外壳:模块 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包装:散装 工作温度:-55°C ~ 100°C 效率:* 电源（瓦特）- 最大:* |
| PT550F | 功能描述:光电晶体管 PT550 w/ visible lite cut off RoHS:否 制造商:OSRAM Opto Semiconductors 最大功率耗散:165 mW 最大暗电流:200 nA 封装 / 箱体:T-1 |
| PT-55130 | 制造商:OPTOWAY 制造商全称:Optoway Technology Inc 功能描述:3.3V / 1.55 レm / 622 Mbps InGaAs PIN-TIA Receiver |
| PT-55130B | 制造商:OPTOWAY 制造商全称:Optoway Technology Inc 功能描述:3.3V / 1.55 レm / 622 Mbps InGaAs PIN-TIA Receiver |
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