參數(shù)資料
型號(hào)： 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(yè)數(shù)： 8/27頁(yè)
文件大小： 667K
代理商： TDA16850-2
Version 2.0
16
1 April 2001
TDA16850-2
3.9
Protection Circuitry
3.9.1 Over Current
A slow current limitation is realized with Comp3. If the
voltage at pin CS reached 1,2V (typ.) pin SST will be
discharged by T1 (see Figure 14).
Figure 14 Timing Diagram Over Current Function
3.9.2 Short Circuit
By means of the fast comparator Comp2 sensing at pin
CS peak current limitation is realized. When being
activated (V
CS > 1,5V typ.) it will immediately shut down
the GATE (see Figure 15).
Figure 15 Protection Function Short Circuit
3.9.3 Failure Modes
The failure modes are stored in FF1 after typically
70s. GATE then will be disabled und pin SST and
VCC discharged by T7 and T3. FF1 is reset again when
the chip is in off mode (see Figure 16).
Figure 16 Timing Diagram Failure Mode
3.9.3.1 Mains Undervoltage
Comp12 checks the rise of the ramp signal at pin CS
for minimum slew rate. If the ramp rise falls below a
lower limit value this means the mains voltage is too
low. The GATE output is disabled then.
3.9.3.2 IC Supply Overvoltage
A further Comparator Comp7 disables GATE, if a
current of more than 4 mA typ. flows over the Zener
diode Z1 at VCC, i.e. if there is overvoltage at VCC
caused by a loop fault.
3.9.3.3 IC Overtemperature
If in case of an error condition the TDA 16850-2 is
supplied over an extended period from a high feed
voltage at VREG, the chip will dissipate high power. An
internal overtemperature detection disables GATE via
FF1 if there is a thermal overload.
3.9.3.4 VREG Loop Failure
Comp9 and Comp10 checks the voltage at pin VREG
and SST. If V
VREG is below 3 V and VSST have reached
2,6V (typ.), i.e. if there is undervoltage at pin VREG
caused by a loop fault, GATE will be disabled.
3.9.3.5 IC Supply Undervoltage
Comp8 checks the voltage at pin VCC. If V
VCC falls
below 8 V GATE will be disabled.
V
SST
V
CS
1,2 V
Time
V
RMP
V
GATE
Time
V
CS
1,5 V
V
PWM
out
Time
V
Failure
V
Latch out
V
GATE
V
VCC
V
SST
7.5 V
T < 70s
Startup Mode, Normal Mode,
Standby Mode, Power Down Mode
Protection
Mode
Off Mode
T > 70s
Time
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