CYStech Electronics Corp.

Spec. No. : C531A3

Issued Date : 2003.04.08

Revised Date :

. .

Page No. : 1/3

PL79L12A3

CYStek Product Specification

Three Terminal Low Current Negative Voltage Regulators

PL79L12XA3

Description

The PL79L12XA3 is an inexpensive, easy-to-use device suitable for numerous

applications requiring up to 100mA. Like the higher powered PL7900E3 series

negative regulators, this device features thermal shutdown and current limiting,

making it remarkably rugged. In most applications, no external components are

required for operation.

The PL79L12A3 device is useful for on-card regulation or any other application where a regulated negative voltage

at a modest current level is needed. This regulator offers substantial advantage over the common resistor/zener diode

approach.

• No external components required

•Internal short circuit current limiting

•Internal thermal overload protection

•Low cost

•Complementary positive regulators offered(PL78L12A3)

•Available in either ±3% or ±5% selection.

• Input Voltage……………………………………………………………………………………………….-35V

• Total Power Dissipation……………………………………………………………………. Internally limited

• Operating Temperature Range……………………………………………………………. 0 °C to +125 °C

• Maximum Junction Temperature……………………………………………………………………..+150 °C

• Storage Temperature Range………………………………………………………………-55 °C to +150 °C

°C

Gnd

R17

R16

Outpu

Q12

R15

Q13

R14

Q11

Q2

Q7

Q6

C

R10

R11

Q9

Q14

Q8

R9

R4

R7

Q4

Q5

R8

R6

Q10

R1

R18

R5

R2

Q1

D1

Z1

Input

R3

Representative Schematic Diagram

Typical Application

TO-92

PL79L12

Vout

Vin

C1

C2

Note:

C1 and C2 are required if regulator is

located far from power supply filter

and load, or oscillation may induced

on the loop.