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參數(shù)資料
| 型號： | 108847245 |
| 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> | 861K |
| 代理商： | 108847245 |
Tyco Electronics Corp.
3
Data Sheet
June 2001
3.3 Vdc and 5.0 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 5A
Austin Lite Non-Isolated SMT DC - DC Power Modules:
Output Control (continued)
The output voltage may be margined up or down in direct proportion to the percentage deviation of the control pin
from 1.5V. The control pin may be driven by an imposed voltage to margin up or down or shunted by a resistive ele-
ment to ground for margin down. The preferred margin technique employs an external control voltage to margin up
or down. A resistor shunt may be used to margin down but the reference will sag due to its internal impedance.
VOUT:
The value of the output voltage after margining
VCONTROL: The voltage at the CTRL pin
VOUTNOM: The ouput voltage if the control pin is left open
RMARGIN:
The shunt resistor to ground for margining
1-0249
Margin Up
To margin the converter up apply a voltage to the CTRL pin that is above 1.50 volts by the same percentage as the
desired margin up percentage
Example:Margin up 5%: Applying 1.575 volts to the CTRL pin will increase the output voltage by 5% over its
unmargined value
Margin Down
Assume a percentage to margin down. Then connect a resistor RMARGIN between CTRL and GND. Use the follow-
ing relations to decide the value of RMARGIN:
1-0250
CTRL
–
+
TO FB
REFERENCE
100 A
51.1 K
1.5 V
+
–
499
VCONTROL
+
–
VCONTROL = 1.5 (1 + MARGIN UP %)
VCONTROL = 1.5 (1 + .05)
VCONTROL = 1.575
CTRL
–
+
TO FB
51.1 K
1.5 V
+
–
499
RMARGIN
REFERENCE
100 A
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