參數(shù)資料
型號(hào)： TDA16850-2
廠(chǎng)商： INFINEON TECHNOLOGIES AG
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.1 A SWITCHING CONTROLLER, 70 kHz SWITCHING FREQ-MAX, PDIP8
封裝： PLASTIC, DIP-8
文件頁(yè)數(shù)： 6/27頁(yè)
文件大小： 667K
代理商： TDA16850-2
Version 2.0
14
1 April 2001
TDA16850-2
the SYNC signal with a delay, which is 1/20 of the
SYNC signal period (see Figure 8).
Figure 8 Timing Diagram Oscillator with Synchro-
nisation
Figure 9 Timing Diagram 60/20 kHz Switch and
Synchronisation
If I
OPTO falls below 2 mA the unsynchronized oscillator
will switch from 60 kHz to 20 kHz (see Figure 9).
The sync input is protected by a Zener diode Z2 and a
hysteresis comparator Comp1.
3.4 PWM Section
The PWM Section is equipped with improved current
mode control.
The pulse width modulator of the TDA 16850-2
operates at a small pulse width in voltage mode and
with a larger pulse width in current mode. The GATE
puls
depends on the SST voltage via Comp4, the
OPTO current via Comp5 and the VREG voltage via
Comp6. A voltage at VREG lower than 11 V will lead to
long GATE pulses, as well as a high OPTO current. A
low voltage at SST dominates over the OPTO and
VREG conditions and sets the limit for the maximum
GATE pulse width. The input, which generates the
longer GATE pulses will dominate over the input, which
would generate the shorter Gate pulses (see Figure
10).
Figure 10 Timing Diagram PWM Section
V
COMP1
V
OSC
V
GATE
Time
V
SYNC
Time
I
OPTO
2 mA
V
OSC
V
SYNC
Time
V
OSC
V
GATE
V
CS
V
RMP
Time
V
PWM OFF
V
PWM
ON
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