ML2280 datasheet(13/20 Pages) MICRO-LINEAR

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ML2280, ML2283

CURRENT LIMITING

RESISTOR, I+

≤15mA

12V

VCC

V+

GND

I +

→

28.8k

Ω

3.2k

Ω

3.2k

Ω

I+

15mA

V+

5.5V

SLOPE =

6.9V

35k

Ω

Figure 10. I-V Characteristic of the Shunt Regulator

SHUNT REGULATOR

A unique feature of the ML2283 is the inclusion of a shunt

regulator connected from V+ terminal to ground which

also connects to the VCC terminal (which is the actual

converter supply) through a silicon diode as shown in

Figure 8. When the regulator is turned on, the V+ voltage

is clamped at 11VBE set by the internal resistor ratio. The

typical I-V of the shunt regulator is shown in Figure 9.

Figure 9. Shunt Regulator

It should be noted that before V+ voltage is high enough

to turn on the shunt regulator (which occurs at about

5.5V), 35k

W resistance is observed between V+ and GND.

When the shunt regulator is not used, V+ pin should be

either left floating or tied to GND. The temperature

coefficient of the regulator is –22mV/°C.

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