VIPER28HE STMicroelectronics, VIPER28HE Datasheet - Page 14

Switching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz

VIPER28HE

Manufacturer Part Number
VIPER28HE
Description
Switching Converters, Regulators & Controllers VIPer28 Rugged 800V Fixed freq 115 kHz
Manufacturer
STMicroelectronics
Datasheet

Specifications of VIPER28HE

Output Voltage
800 V
Output Current
3 A
Output Power
20 W
Input Voltage
8.5 V to 23.5 V
Switching Frequency
115 KHz
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
Through Hole
Package / Case
SDIP-10
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
VIPER28HE
Manufacturer:
STM
Quantity:
2 000
Operation descriptions
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7.1
7.2
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Operation descriptions
VIPER28
rugged Power section.
The controller includes: the oscillator with jittering feature, the start up 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 brown-out 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 guaranties high
performance in the stand-by mode and helps in the energy saving norm accomplishment.
All the fault protections are built in auto restart mode with very low repetition rate to prevent
IC's over heating.
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 it is enabled only if the
input bulk capacitor voltage is higher than V
the HV current generator is ON, the I
capacitor on the V
reduced to 0.6 mA, in order to have a slow duty cycle during the restart phase.
is a high-performance low-voltage PWM controller chip with an 800 V, avalanche
DD
pin. In case of auto restart mode after a fault event, the I
Doc ID 15028 Rev 4
DDch
VDSS
current (3 mA typical value) is delivered to the
of 800 V min. and a typical R
DRAIN_START
threshold, 80 V
DS(on)
DC
typically. When
DDch
of 7 Ω
current is
VIPER28

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