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參數(shù)資料
| 型號(hào)： | TDA16822 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 107 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 4/14頁(yè) |
| 文件大?。?/td> | 234K |
| 代理商： | TDA16822 |
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TDA 16822
CoolSET
Version 2.0
12
11 April 2000
Protection Unit (Hiccup Mode)
An overload and open loop protection is integrated
within the Protection Unit. These two failure modes are
latched by an Error-Latch. Additional thermal shutdown
and undervoltage protection of V
CC is latched by the
Error-Latch. In case of these failure modes the Error-
Latch is set after a delay of 5us and CoolMOS is shut
down. This delay prevents the Error-Latch from spikes
during normal operation mode.
-Overload & Open loop with normal load
The detection of open loop or overload is provided by
the Comparator C3, C5 and the AND-gate G2. The
detection is activated by C5 when the voltage at pin
SoftS exceeds 5.3V. Henceforth the comparator C3
can set the Error-Latch in case of open loop or overload
which leads the feedback voltage V
FB to exceed the
threshold of 4.8V. After latching VCC decreases till 9V.
At this time the external Soft-Start capacitor is
discharged by the internal transistor T1 due to Power
Down Reset.
Figure 6
When the IC is inactive VCC increases till 14V. Now the
Error-Latch is reset by Power Up Reset and the
external Soft-Start capacitor C
Soft-Start is charged by the
internal pullup resistor R
Soft-Start. During the Soft-Start
phase which ends when the voltage at pin SoftS
exceeds 6V the detection of overload and open loop by
C3 and G2 is inactive. In this way the start up phase is
not detected as an overload. But after the Soft-Start
phase the start up phase must be finished to force the
voltage at FB under the failure detection threshold of
4.8V. Figure 6 shows the hiccup mode in case of
overload or open loop with normal load.
-Open loop with no load
An additional protection by the comparators C1, C2
and the AND-gate G1 is implemented. In case of open
loop and no load condition the burst phase during
hiccup mode is
finished early. In this situation the
converter output voltage increases and also V
CC.
Figure 7
An overvoltage protection is provided by Comparator
C1 in the first time till the Soft-Start voltage exceeds the
threshold of the Comparator C2 at 4V and the voltage
Overload & Open loop/normal load
FB
t
4.8V
5.3V
SoftS
5us Delay
Failure
Detection
Soft-Start Phase
VCC
14V
9V
t
Driver
t
T
Hiccup
T
Burst
t
Open loop & no load condition
FB
t
4.8V
5.3V
SoftS
5us Delay
Failure
Detection
4V
Overvoltage
Detection Phase
Soft-Start Phase
Driver
t
T
Hiccup
T
Burst
VCC
9V
14V
16V
Overvoltage Detection
t
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