Datasheet
Table Of Contents
- Figure 1. Typical topology
- Table 1. Device summary
- 1 Block diagram
- 2 Typical power
- 3 Pin settings
- 4 Electrical data
- 5 Typical electrical characteristics
- Figure 7. Current limit vs. TJ
- Figure 8. Switching frequency vs. TJ
- Figure 9. Drain start voltage vs. TJ
- Figure 10. HFB vs. TJ
- Figure 11. Brownout threshold vs. TJ
- Figure 12. Brownout hysteresis vs. TJ
- Figure 13. Brownout hysteresis current vs. TJ
- Figure 14. Operating supply current (not switching) vs. TJ
- Figure 15. Operating supply current (switching) vs. TJ
- Figure 16. Current limit vs. RLIM
- Figure 17. Power MOSFET ON resistance vs. TJ
- Figure 18. Power MOSFET breakdown voltage vs. TJ
- Figure 19. Thermal shutdown
- 6 Typical circuit
- 7 Efficiency performances for a typical flyback converter
- 8 Operation description
- 8.1 Power section and gate driver
- 8.2 High voltage startup generator
- 8.3 Power-up and soft-start
- 8.4 Power down operation
- 8.5 Auto-restart operation
- 8.6 Oscillator
- 8.7 Current mode conversion with adjustable current limit set point
- 8.8 Overvoltage protection (OVP)
- 8.9 About the CONT pin
- 8.10 Feedback and overload protection (OLP)
- 8.11 Burst mode operation at no load or very light load
- 8.12 Brownout protection
- 8.13 2nd level overcurrent protection and hiccup mode
- 9 Package mechanical data
- 10 Revision history
Block diagram VIPER37
4/35 Doc ID 022218 Rev 1
1 Block diagram
2 Typical power
Figure 2. Block diagram
VDD
THER MAL
SHUTDOWN
6uA
LEB
&
OVP
LOGIC
SOFT
START
OCP
BLOCK
Ref
TUR N-ON
LOGIC
DRAIN
SUPPLY
& UVLO
OTPOLP
BURST
Internal Supply bus
BR
BURST-MODE
LOGIC
BURST
S
R1
R2
Q
+
-
UVLO
Vin_OK
+
-
OCP
Ref erence Voltages
OVP
15uA
Istart-up
OVP
Vcc
OSCI LLATOR
FB
V
BRth
HV_ON
OTP
.
GND
+
-
Rsense
CONT
+
-
PWM
2nd OCP
LOGIC
VDD
Table 2. Typical power
Part number
230 V
AC
85-265 V
AC
Adapter
(1)
Open frame
(2)
Adapter
(1)
Open frame
(2)
VIPER37 23 W 25 W 13 W 15 W
1. Typical continuous power in non-ventilated enclosed adapter measured at 50 ° C ambient.
2. Maximum practical continuous power in an open frame design at 50
° C ambient, with adequate heatsinking.