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參數資料
| 型號： | PT4524N |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 20 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT PACKAGE-12 |
| 文件頁數： | 8/10頁 |
| 文件大?。?/td> | 217K |
| 代理商： | PT4524N |
Application Notes
For technical support and more information, see inside back cover or visit www.ti.com
Using the Remote On/Off Function on the PT4500/
PT4520 Series of Isolated DC/DC Converters
For applications requiring output voltage on/off control,
the PT4500/4520 series of DC/DC converters incorporate
a remote on/off function. This function may be used in
applications that require battery conservation, power-up/
shutdown sequencing, and/or to coordinate the power-up
of the regulator for active in-rush current control. (See
the related application note, SLTA021).
This function is provided by the Remote On/Off control,
pin1. If pin 1 is left open-circuit, the converter provides
a regulated output whenever a valid source voltage3 is
applied between +Vin(pin 4, 5), and –Vin (pin 2, 3).
Connecting pin 1 to pin 2, or applying a low-level signal
to pin 1 (with respect to –Vin), 1 will disable the regulator
output 5.
Table 3-1 provides details of the interface requirements
for the Remote On/Off pin. Figure 3-1 shows how a discrete
MOSFET (Q1), may be referenced to the negative input
voltage rail and used with this control input.
Table 3-1 Inhibit Control Requirements 1
Parameter
Min
Max
Enable (VIH)
2.5V
(Open Circuit) 4
Disable (VIL)
–0.3V
0.8V
Notes:
1. The on/off control uses -Vin (pin 1), on the primary
side of the converter, as its ground reference. All
voltages specified are with respect to -Vin.
2. The on/off control internal circuitry is a high
impedance 10A current source. The open-circuit
voltage may be as high as 8.3Vdc.
3. The PT4500/20 series incorporates an “Under-Voltage
Lockout” (UVLO) function. The UVLO prevents
operation of the converter when there is sufficient input
voltage to support a regulated output. Below the UVLO
threshold voltage, there is no output from the module
and the Remote On/Off control is inoperative.
4. The Remote On/Off input of the PT4500/20 series
must be controlled with a low-leakage (<100nA) open-
drain MOSFET.
Do not use a pull-up resistor.
5. When the converter output is disabled, the current
drawn from the input supply is typically reduced to
8mA (16mA maximum).
6. Keep the on/off transition to less than 1ms. This
prevents erratic operation of the ISR, whereby the
output voltage may drift un-regulated between 0V
and the rated output during power-up.
Figure 3-1
Turn-On Time:
The converter typically produces a fully
regulated output voltage within 35ms after the removal
of the low voltage signal from the Remote On/Off pin.
Using the circuit of Figure 3-1, Figure 3-2 shows the
output voltage and input current waveforms of a PT4521
after Q1 is turned off. The turn off of Q1 corresponds to
the drop in Q1 Vgs voltage. The waveforms were mea-
sured with a 48Vdc input voltage, and 2.75-A resistive
load.
Figure 3-2
+V
in
– V
in
+V
o
– V
o
Q1
BSS138
V
GS
Note 4
PT4500/4520
+ Vout
–Vout
+Vin
–Vin
Remote
On/Off
V
o (adj)
1
2, 3
4, 5
9,10
7, 8
6
PT4500/4520 Series
Vout (2V/Div)
Iin (0.2A/Div)
Q1 Vgs (10V/Div)
HORIZ. SCALE: 5ms/Div
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| PT4526 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W 48-V Input Isolated DC/DC Converter |
| PT4526A | 功能描述:CONV DC-DC 1.5V 5A 48VIN HORZ RoHS:是 類別:電源 - 板載 >> DC DC Converters 系列:PT4520 設計資源:Maxi/Mini/Micro Design Guide, Appl Manual 標準包裝:1 系列:Maxi 類型:隔離 輸出數:1 電壓 - 輸入（最?。?43V 電壓 - 輸入（最大）:110V Voltage - Output 1:15V Voltage - Output 2:- Voltage - Output 3:- 電流 - 輸出（最大）:* 電源（瓦） - 制造商系列:400W 電壓 - 隔離:* 特點:* 安裝類型:通孔 封裝/外殼:模塊 尺寸/尺寸:4.60" L x 2.20" W x 0.54" H（116.8mm x 55.9mm x 13.7mm） 包裝:散裝 工作溫度:-55°C ~ 100°C 效率:* 電源（瓦特）- 最大:* |
| PT4526C | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W 48-V Input Isolated DC/DC Converter |
| PT4526N | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W 48-V Input Isolated DC/DC Converter |
| PT4527 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:20-W 48-V Input Isolated DC/DC Converter |
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