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参数资料
| 型号： | LM3460M5X-1.2/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 1.22 V, PDSO5 |
| 封装： | SOT-23, 5 PIN |
| 文件页数： | 5/9页 |
| 文件大小： | 582K |
| 代理商： | LM3460M5X-1.2/NOPB |
Product Description
The LM3460 is a shunt regulator designed for use as a
precision control element in a feedback loop. The regulated
output 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
REG 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
simplify 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
OUT Set test point and
selecting the appropriate R
L or IOUT as specified in the
Electrical Characteristics section. Use a DVM at the "mea-
sure" test points to read the data.
01260309
V
OUT Set Note: 0V to 500 mV for LM3460-1.5
0V to 200 mV for LM3460-1.2
FIGURE 3. Test Circuit
LM3460
www.national.com
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