TDA16846(2000) 查看數據表（PDF） - Infineon Technologies

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TDA16846
(Rev.:2000)

Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor Correction

Infineon Technologies 

TDA 16846

TDA 16847

1.4

Short Description of the Pin Functions

Pin

Function

1

A parallel RC-circuit between this pin and ground determines the ringing

suppression time and the standby-frequency.

2

A capacitor between this pin and ground and a resistor between this pin and

the positive terminal of the primary elcap quantifies the max. possible output

power of the SMPS.

3

This is the input of the error amplifier and the zero crossing input. The output

of a voltage divider between the control winding and ground is connected to

this input. If the pulses at pin 3 exceed a 5 V threshold, the control voltage at

pin 4 is lowered.

4

This is the pin for the control voltage. A capacitor has to be connected

between this pin and ground. The value of this capacitor determines the

duration of the softstart and the speed of the control.

5

If an opto coupler for the control is used, it’s output has to be connected

between this pin and ground. The voltage divider at pin 3 has then to be

changed, so that the pulses at pin 3 are below 5 V.

6

Fault comparator 2: If a voltage > 1.2 V is applied to this pin, the SMPS stops.

7

If fixed frequency mode is wanted, a parallel RC circuit has to be connected

between this pin and ground. The RC-value determines the frequency. If

synchronized mode is wanted, sync pulses have to be fed into this pin.

8

Not connected (TDA 16846). / This is the power measurement output of the

Temporary High Power Circuit. A capacitor and a RC-circuit has to be

connected between this pin and ground (TDA 16847).

9

Output for reference voltage (5 V). With a resistor between this pin and ground

the fault comparator 2 (pin 6) is enabled.

10

Fault comparator 1: If a voltage > 1 V is applied to this pin, the SMPS stops.

11

This is the input of the primary voltage check. The voltage at the anode of the

primary elcap has to be fed to this pin via a voltage divider. If the voltage of

this pin falls below 1 V, the SMPS is switched off. A second function of this pin

is the primary voltage dependent fold back point correction (only active in free

running mode).

12

Common ground.

13

Output signal. This pin has to be connected across a serial resistor with the

gate of the power transistor.

14

Connection for supply voltage and startup capacitor. After startup the supply

voltage is produced by the control winding of the transformer and rectified by

an external diode.

Data Sheet

5

2000-01-14

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