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參數(shù)資料
| 型號： | TDA16850-2 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 70 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 5/27頁 |
| 文件大?。?/td> | 667K |
| 代理商： | TDA16850-2 |
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Version 2.0
13
1 April 2001
TDA16850-2
3.1
VCC and VREG Section
The TDA 16850-2 is protected against overvoltages
above 23 V typ. by an internal Zener diode Z1 at pin
VCC (see Figure 4).
Figure 4 Undervoltage Lockout Hysteresis and Ze-
ner Diode Overvoltage Protection
In the normal mode the chip is supplied via VCC. The
nominal voltage at VCC then is typ. 15 V. The feedback
path leads from a secondary voltage (e.g. 190 V)
through a secondary reference element (i.e. TL 431)
and the optocoupler to the feedback pin OPTO (see
Figure 19) .
In standby mode the chip is supplied via pin VREG. Pin
VREG is then the feedback input at the same time. The
voltage at VREG is regulated to typ. 11 V via OTA1
(see Figure 5). The intern supply voltages are then
derived from the voltage at VREG via OP4, D1 and T4
Figure 5 Transferfunction of OTA1
3.2
OPTO Section
At pin OPTO (see Figure 6) the TDA 16850-2 has an
integrated 150 kHz lowpass filter which eliminates
interference spikes .
Figure 6 Output Characteristic of Pin OPTO
In normal mode Pin OPTO is the feedback input for the
TDA 16850-2 via OP2 (see Figure 7).
Figure 7 Transferfunction of OP2
Comp11 checks the current at pin OPTO. If I
OPTO falls
below 160 A GATE will be disabled .
3.3
Oscillator and Synchronization
In standby mode and in startup mode the oscillator
frequency is typ. 20 kHz. In normal mode the
unsynchronized oscillator frequency is typ. 60 kHz.
If there is a signal present at SYNC within 30 kHz to
130 kHz, the oscillator switches automatically to
synchronized operation.
The Synchronisation input is positive edge triggered.
The GATE output pulse begins after the rising edge of
0
1
2
3
4
5
0
2
4
6
8
10
1214
161820
2224 V
V
VCC
mA
I
VCC
0,0
1,0
2,0
3,0
4,0
5,0
6,0
7,0
10,4
10,525
10,65
10,775
10,9
11,025
V
VREG
V
PWM
0,0
0,5
1,0
1,5
2,0
2,5
01
23
45
67
8
mA
I
OPTO
V
OPTO
0,0
1,0
2,0
3,0
4,0
5,0
6,0
7,0
01
23
45
67
8
mA
I
OPTO
V
PWM
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