參數(shù)資料
型號(hào)： TDA16850-2
廠商： 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)： 7/27頁(yè)
文件大?。?/td> 667K
代理商： TDA16850-2
Version 2.0
15
1 April 2001
TDA16850-2
3.5 Current Sense Section
The voltage at the shunt resistor of the Power MOS is
fed to OP1 (see Figure 11) via pin CS. No other
external circuit is required. An internal low pass filter
with an initial condition suppresses a leading spike at
CS up to 150nVs typ.
Figure 11 Transferfunction of OP1
3.6
Soft Start
On the transition from off mode to startup mode a soft
start is activated. Depending on the voltage at the
capacitor at pin SST the increasing of the duty cycle is
controlled via Comp4.
3.7
Output Power Limiting
After the end of the soft start there is a maximum
voltage at the capacitor at pin SST. This voltage is a
signal for the maximum possible pulse width at GATE
via Comp4.
The maximum voltage at SST is regulated depending
on the oscillator frequency. The value of the voltage is
derived from the square root of the oscillator period.
The energy that can be stored in the transformer is
reduced in proportion to the oscillator frequency. The
maximum output power is idependent from SYNC
frequency (see Figure 12).This reduces the danger of
fire if a defect within the load circuit occurs.
Figure 12 Voltage at Softstart Capacitor vs. Oscil-
lator Frequency
3.8
GATE Driver
GATE switches from low to high first with high current
and then with reduced current. This current switchover
takes place at a voltage at GATE of typ. 6 V (see
Figure 13).
In off mode GATE is safely disabled, i.e. low. In this
state transients at drain with miller currents up to 20 mA
can not open the power MOS.
Figure 13 Rising Edge of Driver Output
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
4,50
5,00
5,50
6,00
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
1 V
V
CS
V
C2
Slew Rate V
CS = 100
mV
sec
3,5
4,0
4,5
5,0
5,5
6,0
6,5
10
20
30
40
50
60
70
80
90
100
110
120
kHz
f
GATE
V
SST max
0
2
4
6
8
10
12
0
50
100
150
200
250
300
350
400
Time
V
GATE
ns
V
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