VIPER06HSTR STMicroelectronics, VIPER06HSTR Datasheet - Page 19

• Manufacturer Part Number: VIPER06HSTR
• Description: AC/DC Switching Converters VIPer 800V Plus Fixed Freq 115kHz
• Manufacturer: STMicroelectronics
• Type: PWM Low-Standby High Performance Controllerr

Specifications of VIPER06HSTR

• Rohs: yes
• Output Voltage: 800 V
• Input / Supply Voltage (max): 23.5 V
• Input / Supply Voltage (min): 11.5 V
• Switching Frequency: 115 kHz
• Supply Current: 1.6 mA
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: SSO-10
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 25 C
• Number Of Outputs: 1
• Output Power: 30 mW

VIPER06
14
Automatic auto-restart after overload or short-circuit
The overload protection is implemented automatically using the integrated up-down counter.
Every cycle, it is incremented or decremented depending upon the current logic detection of
the limit condition or not. The limit condition is the peak drain current, I
on page 8
page
level I
MOSFET switch ON will be disabled. It will be activated again through the soft-start after the
t
Table 7 on page
For overload or short-circuit events, the power MOSFET switching will be stopped after a
period of time dependent upon the counter with a maximum equal to t
sequence continues until the overload condition is removed, see
This protection ensures a low repetition rate of restart attempts of the converter, so that it
works safely with extremely low power throughput and avoids overheating the IC in case of
repeated overload events. If the overload is removed before the protection tripping, the
counter will be decremented cycle-by-cycle down to zero and the IC will not be stopped.
Figure 25. Timing diagram: OLP sequence (IC externally biased)
Figure 26. Timing diagram: OLP sequence (IC internally biased)
RESTART
V
I
Dlim_bm
DDCSon
V
I
11. After the reset of the counter, if the peak drain current is continuously equal to the
Dlim
DRAIN
V
DDon
DD
V
I
Dlim_bm
DDCSon
V
I
DRAIN
, the counter will be incremented until the fixed time, t
time (see
V
DDon
* The time t
DD
or the one set by the user through the R
SHORT CIRCUIT
OCCURS HERE
* The time t
SHORT CIRCUIT
OCCURS HERE
t
1
*
8.
1
t
can be lower or equal to the time t
1
*
Figure 25
1
can be lower than or equal to the time t
t
RESTART
t
RESTART
and
Doc ID 022794 Rev 1
t
SS
t
SS
Figure 26 on page
Automatic auto-restart after overload or short-circuit
t
OVL
t
OVL
OVL
OVL
t
t
RESTART
RESTART
LIM
19) and the time values mentioned in
t
SS
t
SS
resistor, shown in
t
OVL
t
OVL
OVL
SHORT CIRCUIT
REMOVED HERE
t
RESTART
SHORT CIRCUIT
REMOVED HERE
Figure 25
, at which point the power
t
RESTART
OVL
Dlim ,
Figure 13 on
t
. The protection
SS
and
given in
t
SS
Figure
time
time
time
Table 7
time
26.
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