TEA5170
SWITCH MODE POWER SUPPLY SECONDARY CIRCUIT
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INTERNAL PWM SIGNAL GENERATOR POWER SUPPLY WIDE RANGE 4.5V – 14.5V SOFT START REFERENCE VOLTAGE 2V ± 5% WIDE FREQUENCY RANGE 250kHz MINIMUM OUTPUT PULSE WIDTH 500nS MAXIMUM PRESET DUTY CYCLE SYNCHRONIZATION WINDOW OUTPUT SWITCH UNDERVOLTAGE LOCKOUT FREQUENCY RANGE WITH SYNCHRONIZATION 64kHz
DIP8 (Plastic Package) ORDER CODE : TEA5170
DESCRIPTION The TEA5170 is designed to work in the secondary part of an off-line SMPS, .
SWITCH-MODE POWER-SUPPLY
TEA5170
SWITCH MODE POWER SUPPLY SECONDARY CIRCUIT
. . . . . . . . . . .
INTERNAL PWM SIGNAL GENERATOR POWER SUPPLY WIDE RANGE 4.5V – 14.5V SOFT START REFERENCE VOLTAGE 2V ± 5% WIDE FREQUENCY RANGE 250kHz MINIMUM OUTPUT PULSE WIDTH 500nS MAXIMUM PRESET DUTY CYCLE SYNCHRONIZATION WINDOW OUTPUT SWITCH UNDERVOLTAGE LOCKOUT FREQUENCY RANGE WITH SYNCHRONIZATION 64kHz
DIP8 (Plastic Package) ORDER CODE : TEA5170
DESCRIPTION The TEA5170 is designed to work in the secondary part of an off-line SMPS, sending pulses to the slaved TEA2260/61 which are located on the primary side of the main transformer. An accurate regulated voltage is obtained by duty cycle control. The TEA5170 can be externally synchronized by higher or lower frequency signal, then it could be used in applications like TV set ones. For more details, refer to application note AN408/0591. PIN CONNECTIONS
SOFT-START CAPACITOR SUPPLY VOLTAGE POWER OUTPUT
CSF V CC P OUT
1 2 3 4
8 7 6 5
RT CT
OSCILLATOR RESISTOR OSCILLATOR CAPACITOR
GROUND GND
E OUT VOLTAGE ERROR AMPLIFIER OUTPUT VOLTAGE ERROR AMPLIFIER E INVERTING INPUT
5170-01.EPS
September 1993
1/9
TEA5170
BLOCK DIAGRAM
Rt 8 Comparator Ct 7
OSCILLATOR LOGIC (SYNCHRO) POWER OUTPUT STAGE
2.7V
Csf 1
SOFT START AND DUTY CYCLE LIMITING
PWM
LOGIC
Error Amplifier E- 5
x -1 PWM
2V
V CC Monitor
6 Eout 4 GND 2 V CC 3 P out
5170-02.EPS
ABSOLUTE MAXIMUM RATINGS
Symbol VCC Tj Tstg Supply Voltage Operating Junction Temperature Storage Temperature Range Parameter.