R1152N

6

OPERATION

compared with a reference voltage with the error amplifier and control the base current of an external PNP

transistor so that a constant voltage is output. The base current is monitored with the base current limit circuit.

If the base current may be too large, the protection circuit works.

TECHNICAL NOTES

When using these ICs, consider the following points:

result.

When you choose an external transistor, select with considering output current, input voltage, and power

In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For

this purpose, be sure to use a 10

µF or more output capacitor, as close as possible to the ICs.

If you choose an electrolytic capacitor, ESR shift by temperature should be small. If you choose a ceramic

capacitor, add an appropriate series resister.

=100)

Voltage level for CE should not be floating, or middle range voltage. If the CE voltage is not appropriate, output

voltage may be unstable or conduction current may flow.

All external components should be located as close as possible to the IC, and wiring should be as short as

possible.