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TDA16847 데이터시트(PDF) 8 Page - Infineon Technologies AG |
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TDA16847 데이터시트(HTML) 8 Page - Infineon Technologies AG |
8 / 28 page TDA 16846 TDA 16847 Data Sheet 8 2000-01-14 2 Functional Description Start Up Behaviour (Pin 14) When power is applied to the chip and the voltage V 14 at Pin 14 (VCC) is less than the upper threshold ( V ON) 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 V 14 exceeds the upper SVC threshold (VON) the chip starts working and I 14 increases. When V14 falls below the lower SVC threshold ( V OFF) the chip starts again at his initial condition. Figure 4 shows the start-up circuit and Figure 5 shows the voltage V 14 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 C 14 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. Figure 4 Startup Circuit AES02649 SVC TDA 16846 D1 2 14 CC V PCS 2 C R2 C14 Cp Out V TR D14 |
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