VIPER37LE STMicroelectronics, VIPER37LE Datasheet - Page 19

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VIPER37LE

Manufacturer Part Number
VIPER37LE
Description
AC/DC Switching Converters ViperPlus Fixed Freq 800V 30mQ 265 Vac
Manufacturer
STMicroelectronics
Type
Off Line Switcherr
Datasheet

Specifications of VIPER37LE

Product Category
AC/DC Switching Converters
Input / Supply Voltage (max)
23.5 V
Input / Supply Voltage (min)
8.5 V
Switching Frequency
60 kHz
Supply Current
2.5 mA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
Through Hole
Package / Case
SDIP-10
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 25 C
Number Of Outputs
1
Output Power
25 W

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Quantity
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Part Number:
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Manufacturer:
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VIPER37
8
8.1
8.2
Operation description
The device is a high-performance low-voltage PWM controller chip with an 800 V avalanche
rugged power section.
The controller includes: the oscillator with jittering feature, the startup circuits with soft-start
feature, the PWM logic, the current limit circuit with adjustable set point, the second
overcurrent circuit, the burst mode management, the brownout circuit, the UVLO circuit, the
auto-restart circuit, and the thermal protection circuit.
The current limit set-point is set by the CONT pin. The burst mode operation guarantees
high performance in standby mode and helps to accomplish the energy saving norm.
All the fault protections are built in auto-restart mode with very low repetition rate to prevent
the IC overheating.
Power section and gate driver
The power section is implemented with an avalanche ruggedness N-channel MOSFET,
which guarantees safe operation within the specified energy rating as well as high dv/dt
capability. The power section has a B
at 25 ° C.
The integrated SenseFET structure allows a virtually loss-less current sensing.
The gate driver is designed to supply a controlled gate current during both turn-on and turn-
off in order to minimize common mode EMI. Under UVLO conditions an internal pull-down
circuit holds the gate low in order to ensure that the power section cannot be turned on
accidentally.
High voltage startup generator
The HV current generator is supplied through the DRAIN pin and is enabled only if the input
bulk capacitor voltage is higher than the V
HV current generator is ON, the I
capacitor on the V
current is reduced to 0.6 mA, in order to have a slow duty cycle during the restart phase.
DD
pin. In the case of auto-restart mode after a fault event, the I
Doc ID 022218 Rev 1
DDch
VDSS
current (3 mA typical value) is delivered to the
DRAIN_START
of 800 V min. and a typical R
threshold, 80 V
Operation description
DC
DS(on)
(typical). When the
of 4.5 Ω
DDch
19/35

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