參數(shù)資料
型號(hào)： TDA16846G
廠商： INFINEON TECHNOLOGIES AG
元件分類： 穩(wěn)壓器
英文描述： 0.1 A POWER FACTOR CONTROLLER, 98 kHz SWITCHING FREQ-MAX, PDSO14
封裝： PLASTIC, DSO-14
文件頁數(shù)： 27/28頁
文件大?。?/td> 586K
代理商： TDA16846G
TDA 16846
TDA 16846-2
Data Sheet
8
2003-07-31
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), then the input current
I
14 will be less than 100 A. The chip is not active (off state) and driver output (Pin 13)
and control output (Pin 4) will be actively held low. When
V
14 exceeds the upper SVC
threshold (
V
ON) the chip starts working and I14 increases. When V14 falls below the lower
SVC threshold (
V
OFF) the chip starts again from its 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
R
2 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 apply 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.
To avoid multiple pulses during start up in fixed frequency mode (danger of transformer
saturation), the IC works in freerunning mode until the pulses at pin 3 (RZI) exceed the
2.5 V threshold (only TDA 16846-2, TDA 16847-2).
Figure 4
Startup Circuit
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