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

零件编号

产品描述 (功能)

生产厂家

TDA16846
(Rev.:2000)

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

Infineon Technologies 

TDA 16846

TDA 16847

2

Functional Description

Start Up Behaviour (Pin 14)

When power is applied to the chip and the voltage V14 at Pin 14 (VCC) is less than the

upper threshold (VON) of the Supply Voltage Comparator (SVC), input current I14 will be

less than 100 µA. The chip is not active and driver output (Pin 13) and control output

(Pin 4) will be actively held low. When V14 exceeds the upper SVC threshold (VON) the

chip starts working and I14 increases. When V14 falls below the lower SVC threshold

(VOFF) the chip starts again at his initial condition. Figure 4 shows the start-up circuit and

Figure 5 shows the voltage V14 during start up. Charging of C14 is done by resistor R2 of

the “Primary Current Simulation” (see later) and the internal diode D1, so no additional

start up resistor is needed. The capacitor C14 delivers the supply current until the

auxiliary winding of the transformer supplies the chip with current through the external

diode D14.

It is recommended to switch a small RF snubber capacitor of e.g. 100 nF parallel to the

electrolytic capacitor at pin 14 as shown in the application circuits in Figures 15, 16, and

17.

D14

C14

VCC

14

SVC

TR

C2

D1

PCS 2

TDA 16846

R2

VOut

Figure 4 Startup Circuit

Cp

AES02649

Data Sheet

8

2000-01-14

Share Link: