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VIPER27HD-VIPER27HDTR-VIPER27HN-VIPER27LD-VIPER27LDTR-VIPER27LN
VIPerPlus family: fixed frequency high performance off line high voltage converter
July 2010 Doc ID 15133 Rev 5 1/31
VIPER27Off-line high voltage converters
Features 800 V avalanche rugged power section PWM operation with frequency jittering for low
EMI Operating frequency: 60 kHz for L type 115 kHz for H type Standby power < 50 mW at 265 Vac Limiting current with adjustable set point Adjustable and accurate overvoltage
protection On-board soft-start Safe auto-restart after a fault condition Hysteretic thermal shutdown
Application Auxiliary power supply for consumer and home
equipments ATX auxiliary power supply Low / medium power AC-DC adapters SMPS for set-top boxes, DVD players and
recorders, white goods
DescriptionThe device is an off-line converter with an 800 V
rugged power section, a PWM control, two levels
of over-current protection, overvoltage and
overload protections, hysteretic thermal
protection, soft-start and safe auto-restart after
any fault condition removal. Burst mode operation
and device very low consumption help to meet the
standby energy saving regulations.
Advance frequency jittering reduces EMI filter
cost. Brown-out function protects the switch mode
power supply when the rectified input voltage
level is below the normal minimum level specified
for the system. The high voltage start-up circuit is
embedded in the device.
Figure 1. Typical topology 16
Table 1. Device summary
Contents VIPER272/31 Doc ID 15133 Rev 5
Contents Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Typical power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54.1 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Operation descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147.1 Power section and gate driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.2 High voltage startup generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.3 Power-up and soft-start up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.4 Power down operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.5 Auto restart operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.6 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7.7 Current mode conversion with adjustable current limit set point . . . . . . . 18
7.8 Overvoltage protection (OVP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.9 About CONT pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.10 Feed-back and overload protection (OLP) . . . . . . . . . . . . . . . . . . . . . . . . 20
7.11 Burst-mode operation at no load or very light load . . . . . . . . . . . . . . . . . . 23
7.12 Brown-out protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7.13 2nd level over current protection and hiccup mode . . . . . . . . . . . . . . . . . 25
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
VIPER27 Block diagram
Doc ID 15133 Rev 5 3/31
1 Block diagram
2 Typical power
Figure 2. Block diagram
Table 2. Typical power Typical continuous power in non ventilated enclosed adapter measured at 50 °C ambient. Maximum practical continuous power in an open frame design at 50 °C ambient, with adequate heat sinking.
Pin settings VIPER27
4/31 Doc ID 15133 Rev 5
3 Pin settings
Figure 3. Connection diagram (top view)
Note: The copper area for heat dissipation has to be designed under the DRAIN pins.
Table 3. Pin description
VIPER27 Electrical data
Doc ID 15133 Rev 5 5/31
4 Electrical data
4.1 Maximum ratings
4.2 Thermal data
Table 4. Absolute maximum ratings
Table 5. Thermal data When mounted on a standard single side FR4 board with 100 mm2 (0.155 sq in) of Cu (35 µm thick)
