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參數(shù)資料
| 型號： | LM3460M5X-1.5 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Precision Controller for GTLp and GTL Bus Termination |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 1.5 V, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 172K |
| 代理商： | LM3460M5X-1.5 |
Product Description
The LM3460 is a shunt regulator designed for use as a pre-
cision control element in a feedback loop. The regulated out-
put voltage is sensed between the IN pin and GROUND pin
of the LM3460.
The output of the LM3460 sources current whenever the
voltage at the IN pin reaches the regulated voltage.
This current is used to cut off the drive to the external pass
trnasistor, which provides the negative feedback to force the
output voltage to be the same value as V
REG
.
If the voltage on the IN pin is forced above the V
voltage,
the maximum voltage applied to the IN pin should not ex-
ceed 20V. In addition, an external resistor may be required
on the OUT pin to limit the maximum current to 20 mA.
Compensation
The inverting input of the error amplifier is brought out to sim-
plify closed-loop compensation. Typically, compensation is
provided by a single capacitor connected from the COM-
PENSATION pin to the OUT pin of the LM3460.
Applying a load pulse to the output of the regulator circuit
and observing the output voltage response is a good method
of verifying the stability of the control loop.
If excessive ringing on the output waveform is observed, this
usually indicates marginal stability resulting from insufficient
phase margin.
Test Circuit
The test circuit shown in Figure 3 can be used to measure
various LM3460 parameters. Test conditions are set by forc-
ing the appropriate voltage at the V
Set test point and se-
lecting the appropriate R
or I
as specified in the Electri-
cal Characteristics section. Use a DVM at the
″
measure
″
test
points to read the data.
Setting the Output Voltage
If a regulated voltage is desired which is not available as a
standard voltage, the output voltage may be adjusted by us-
ing an external resistive divider (see Figure 4):
DS012603-9
V
OUT
Set Note: 0V to 500 mV for LM3460-1.5
0V to 200 mV for LM3460-1.2
FIGURE 3. Test Circuit
www.national.com
5
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