TDA16822 Infineon Technologies, TDA16822 Datasheet - Page 12

• Manufacturer Part Number: TDA16822
• Description: IC OFFLINE CTRLR SMPS CM 8DIP
• Manufacturer: Infineon Technologies
• Series: CoolSET®F1r

Specifications of TDA16822

• Output Isolation: Isolated
• Frequency Range: 93 ~ 107kHz
• Voltage - Input: 9.5 ~ 17 V
• Voltage - Output: 650V
• Power (watts): 20W
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SP000012897; TDA16822X; TDA16822XK

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
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
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
Version 2.0
Driver
SoftS
VCC
14V
4.8V
5.3V
9V
FB
Overload & Open loop/normal load
5us Delay
Detection
Soft-Start Phase
Failure
T
Burst
CC
T
is latched by the
FB
Hiccup
to exceed the
t
t
t
t
12
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
internal pullup resistor R
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
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
Driver
SoftS
VCC
16V
14V
5.3V
4.8V
9V
FB
4V
5us Delay
Open loop & no load condition
Detection
Detection Phase
Failure
Overvoltage
Soft-Start
Soft-Start Phase
T
Burst
Overvoltage Detection
Soft-Start
. During the Soft-Start
TDA 16822
CoolSET™
T
is charged by the
Hiccup
11 April 2000
CC
.
t
t
t
t