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參數(shù)資料
| 型號： | AUSTIN5V1.5V5AT |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 916K |
| 代理商： | AUSTIN5V1.5V5AT |
Tyco Electronics Corp.
3
Data Sheet
April 2003
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 6A
Austin Series Non-Isolated SMT DC - DC Power Modules:
Output Control
The control pin is a dual-function port that serves to enable/disable the converter or provide a means of adjusting
the output voltage over a prescribed range. When the control pin is grounded, the converter is disabled. With the
pin left open, the converter regulates to its specified output voltage. For any other voltage applied to the pin, the
output voltage follows this relationship:
The Thevenin equivalent input resistance of the control pin is approximately 7.68K ohms and the open circuit
voltage is 1.5V.
The equation to margin low by connecting a resistor from the control pin to ground is:
To margin low by 5%, RLOW = 146K.
The equation to margin high by connecting a resistor, RHIGH, from the control pin to the input voltage, VIN is:
To maintain high of 5%, RHIGH = 351K for VIN = 5 volts and RHIGH = 177K for VIN = 3.3 volts. Trim resistor tolerance
will obviously affect output voltage. To determine the magnitude of this effect, simply use the extreme values in the
above equations.
Because trimming affects the system reference, trimming beyond +/- 10% is unacceptable and +/- approximately
5% is desirable. One affect trimming has, aside from output voltage adjustment, is changing the current limit incep-
tion point. Trimming the unit down beyond 5% requires derating available current by 1% for every percent beyond
5 that the module is trimmed down. For example, if a module is trimmed down 7%, then output current would have
to be derated 2%. If paralleled modules are to be trimmed using the control pin, divide the calculated trim resis-
tance for a single unit by the number of modules paralleled. For example, if two paralleled units are to be trimmed
5% low, then a resistance of 146K divided by 2 should be used.
OUTNOM
CONTROL
OUT
V
=
5
.
1
RLOW
7.68K
VOUT/VOUT nom
1 – VOUT/ VOUT nom
------------------------------------------------------------
=
RHIGH
7.68K
VOUT/VOUTnom – 1
--------------------------------------------------------
=
VIN
1.5
---------- – 1 – 7.68K
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