TDA16846(2000) データシートの表示（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

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 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 from high input currents at 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 made longer with

factor 2.5 at low output voltage. To ensure start-up of the circuit, the value of resistor R1

(Pin 1, Figure 6) must be higher than 20 kΩ.

Data Sheet

16

2000-01-14

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