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TDA4605 Arkusz danych(PDF) 3 Page - Siemens Semiconductor Group

Numer części TDA4605
Szczegółowy opis  Control IC for Switched-Mode Power Supplies using MOS-Transistors
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Producent  SIEMENS [Siemens Semiconductor Group]
Strona internetowa  http://www.siemens.com/
Logo SIEMENS - Siemens Semiconductor Group

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Semiconductor Group
35
TDA 4605
Pin Definitions and Functions
Pin No.
Function
1
Regulating Voltage: Information input concerning secondary voltage.
By comparing the regulating voltage - obtained from the regulating winding ot the
transformer - with the internal reference voltage, the output impulse width on pin 5
is adapted to the load ot the secondary side (normal, overload, short-circuit, no
load).
2
Primary Current Simulation: Information input regarding the primary current.
The primary current rise in the primary winding is simulated at pin 2 as a voltage
rise by means ot external RC-element. When a value is reached that is derived
from the regulating voltage at pin 1, the output impulse at pin 5 is terminated. The
RC-element serves to set the maximum power at the overload point set.
3
Input for Primary Voltage Monitoring: In the normal operation
V3 is moving
between the thresholds
V3H and V3L (V3H > V3 > V3L).
V3 < V3L: SMPS is switched OFF (line voltage too low).
V3 > V3H : Compensation of the overload point regulation (controlled by pin 2)
starts at
V3H : V3L = 1.7.
4
Ground
5
Output: Push-pull-output provides
± 1 A for rapid charge and discharge of the
gate capacitance ot the power MOS-transistor.
6
Supply Voltage Input: A stable internal reference voltage
VREF is derived from
the supply voltage also the switching thresholds
V6A , V6E , V6 max and V6 min for
the supply voltage detector. If
V6 > V6E then VREF is switched on and swiched off
when
V6 < V6A . In addition the logic is only enable for V6 min < V6 < V6 max.
7
Soft-Start: Input for soft-start. Start-up will begin with short pulses by connecting
a capacitor from pin 7 to ground.
8
Zero Detector: Input tor the oscillation feedback. After starting oscillation, every
zero transit of the feedback voltage (falling edge) triggers an output impulse at
pin 5. The trigger threshold is at + 50 mV typical.


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