TDA 4916 GG

Semiconductor Group

8

05.96

Reference Voltage

V

REF

The reference voltage source makes available a source with a high-stability temperature

characteristic which can be used for external connection to the operational amplifier, the

fault comparators, the frequency generator, or to other external units. The voltage

source is short-circuit-proof to ground.

Synchronization I SYN, Q SYN

The device has an input and an output for synchronization. In the case of a synchronized

device (slave), its output Q SIP is in phase opposition to the output Q SIP of the

synchronizing device (master). In the case of an unconnected input I SYN, or with

connection to

V

connected, the device receives its clock from the internal frequency generator in

accordance with the circuit connected to it. As soon as switching transitions appear at

I SYN, switchover to external synchronization and vice versa takes place after a delay.

After a switchover process, a few clock cycles must elapse in addition to the delay before

the frequency and phase achieve their steady states.

Series Feed SF

The Series Feed circuit section is used to turn-OFF the external series-feed transistor

when energy recovery commences. As a result there is minimum power loss in the

supply to the device. With the series-feed transistor turned-OFF, its drive current flows

via VS to

V

SIPMOS Driver Output Q SIP

The output is High active. The time during which the output is active can be continuously

varied.

The duration of the rising edge of the frequency generator signal is the minimum time

during which the output can be Low.

The duration of the falling edge of the frequency generator signal is the maximum time

during which the output can be High.

The output driver is designed as a push-pull stage. The output current is limited internally

to the specified values.

Output Q SIP is connected via diodes to the supply

V

A protection circuit SS lies between Q SIP and GND to clamp the output to ground at low

impedance in the event of undervoltage at

V