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参数资料
| 型号： | PTH12020WAST |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | DIP-10 |
| 文件页数： | 25/27页 |
| 文件大小： | 930K |
| 代理商： | PTH12020WAST |
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DEVICE INFORMATION
PTHXX020
(Top View)
1
2
10 9
8
7
6
5
4
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www.ti.com ............................................................................................................................................................. SLTS208I – MAY 2003 – REVISED MARCH 2009
TERMINAL FUNCTIONS
TERMINAL
DESCRIPTION
NAME
NO.
VI
2
The positive input voltage power node to the module, which is referenced to common GND.
VO
6
The regulated positive power output with respect to the GND node.
This is the common ground connection for the Vin and Vout power connections. It is also the 0 VDC reference for the
GND
1, 7
control inputs.
The Inhibit pin is an open-collector/drain negative logic input that is referenced to GND. Applying a lowlevel ground
signal to this input disables the module’s output and turns off the output voltage. When the Inhibit control is active, the
input current drawn by the regulator is significantly reduced. If the inhibit feature is not used, the control pin should be
Inhibit
3
left open-circuit. The module will then produce an output whenever a valid input source is applied. Do not place an
external pull-up on this pin. For power-up into a non-prebiased output, it is recommended that AutoTrack be utilized for
On/Off control. See the Application Information for additional details.
A 1% resistor must be connected directly between this pin and GND (pin 7) to set the output voltage of the module
higher than its lowest value. The temperature stability of the resistor should be 100 ppm/°C (or better). The set point
range is 1.2 V to 5.5 V for W-suffix devices, and 0.8 V to 1.8 V for L-suffix devices. The resistor value required for a
VO
4
given output voltage may be calculated using a formula. If left open circuit, the module output voltage will default to its
Adjust
lowest value. For further information on output voltage adjustment consult the related application note.
The specification table gives the preferred resistor values for a number of standard output voltages.
VO
The sense input allows the regulation circuit to compensate for voltage drop between the module and the load. For
5
Sense
optimal voltage accuracy Vo Sense should be connected to Vout. It can also be left disconnected.
This is an analog control input that enables the output voltage to follow an external voltage. This pin becomes active
typically 20 ms after the input voltage has been applied, and allows direct control of the output voltage from 0 V up to
the nominal set-point voltage. Within this range the output will follow the voltage at the Track pin on a volt-for-volt basis.
When the control voltage is raised above this range, the module regulates at its set-point voltage. The feature allows
Track
8
the output voltage to rise simultaneously with other modules powered from the same input bus. If unused this input
should be connected to Vin.
NOTE: Due to the under-voltage lockout feature, the output of the module cannot follow its own input voltage during
power up. For more information, consult the related application note.
When this input is asserted to GND, the output voltage is decreased by 5% from the nominal. The input requires an
Margin
9
open-collector (open-drain) interface. It is not TTL compatible. A lower percent change can be accomodated with a
Down
series resistor. For further information, consult the related application note.
When this input is asserted to GND, the output voltage is increased by 5%. The input requires an open-collector
Margin
10
(open-drain) interface. It is not TTL compatible. The percent change can be reduced with a series resistor. For further
Up
information, consult the related application note.
Copyright 2003–2009, Texas Instruments Incorporated
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Product Folder Link(s) :PTH12020W/L
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