TDA16847 查看數據表（PDF） - Infineon Technologies

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TDA16847

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

Infineon Technologies 

TDA 16846

TDA 16846-2

3

Protection Functions

The chip has several protection functions:

Current Limiting

See “Primary Current Simulation PCS (Pin 2) / Current Limiting” and “Fold Back Point

Correction PVC (Pin 11)”.

Over- and Undervoltage Lockout OV/SVC (Pin 14)

When V14 at Pin 14 exceeds 16.5 V, e. g. due to a fault in the regulation circuit, the Error

Flip Flop ERR is set and the output driver is shut-down. When V14 goes below the lower

SVC threshold, ERR is reset and the driver output (Pin 13) and the soft-start (Pin 4) are

shut down and actively held low.

Primary Voltage Check PVC (Pin 11)

When the voltage V11 at Pin 11 goes below 1 V the Error Flip Flop (ERR) is set. E.g. a

voltage divider from the rectified mains at Pin 11 prevents high input currents at a too low

input voltage.

Free Usable Fault Comparator FC1 (Pin 10)

When the voltage at Pin 10 exceeds 1 V, the Error Flip Flop (ERR) is set. This can be

used e. g. for mains overvoltage shutdown.

Free Usable Fault Comparator FC2 (Pin 6)

When the voltage at Pin 6 exceeds 1.2 V, the Error Flip Flop (ERR) is set. A resistor

between Pin 9 (REF) and ground is necessary to enable this fault comparator.

Voltage dependent Ringing Suppression Time

During start-up and short-circuit operation, the output voltage of the converter is low and

parasitic zero crossings are applied for a longer time at Pin 3. Therefore the Ringing

Suppression Time TC1 (see “Off-Time Circuit OTC (Pin 1)”) is extended with a factor of

2.2 at a low output voltage. The voltage at pin 1 must not fall below the limit V1L.

Data Sheet

16

2003-07-31

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