SPH4692 Просмотр технического описания (PDF) - Siemens AG

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SPH4692

Siemens Power Hybrid for SMPS

Siemens AG 

SPH 4692

Pin Definitions and Functions

Pin No.

Function

1

Information Input Concerning Secondary Voltage. By comparing the

regulating voltage - obtained from the regulating winding of the transformer - with

the internal reference voltage, the output impulse width on pin 15 is adapted to

the load of the secondary side (normal, overload, short-circuit, no load).

2

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 of external

RC-element. When a value is reached that's derived from the regulating voltage

at pin 1, the output impulse at pin 15 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

Not connected

6-11

MOSFET-Drain

12

Not connected

13

MOSFET-Source

14

MOSFET-Gate

15

Output: Push-pull output provides ± 1 A for rapid charge and discharge of the

gate capacitance of the power MOS-transistor.

16

Supply Voltage Input. From it a stable internal reference voltage VREF and the

switching thresholds V16A , V16E , V16 max and V16 min for the supply voltage

detector is formed. If V16 > V16E then VREF is switched on and switched off when

V16 < V16A . In addition the logic is only enabled for V16 min > V16 .

17

Input for Soft-Start. Start-up will begin with short pulses by connecting a

capacitor from pin 7 to ground.

18

Input for the Oscillation Feedback. After starting oscillation, every zero transit

of the feedback voltage (falling edge) triggers an output impulse at pin 15. The

trigger threshold is at + 50 mV typical.

Semiconductor Group

3

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