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The device is a high-voltage converter that smartly integrates an 800 V rugged power MOSFET with PWM current-mode control. The power MOSFET allows a very high input Vac to be applied, just limited from its breakdown voltage. This IC is capable of meeting more stringent energy-saving standards as it has very low consumption and operates in burst mode under light load.
The device features an adjustable extra power timer (EPT) that enables the IC to sustain overload conditions for a few seconds.
The integrated HV startup, sense FET and oscillator with jitter allow the advantage of using minimal components in the application.
The device features high-level protections like dual-level OCP, output overvoltage, short-circuit, and thermal shutdown with hysteresis. After the removal of a fault condition, the IC is automatically restarted.
Key Features
- 800 V avalanche-rugged power MOSFET allowing ultra wide range input Vac to be achieved
- Embedded HV start-up and sense FET
- PWM current-mode controller
- OCP with selectable threshold (IDlim) and 2nd OCP with higher value (IDMAX) to protect the IC from transformer saturation or short-circuit of the secondary diode
- 30 mW no-load consumption at 230 Vac
- Two operating frequencies:
- 60 kHz (L type) or 115 kHz (H type)
- Jittered frequency reduces the EMI
- Extra power timer (EPT) blanks the overload current for few seconds
- Output overvoltage protection with tight tolerance and digital noise filter
- Soft-start reduces the stress during startup and increases IC lifetime
- Automatic restart after a fault condition
- Thermal shutdown increases system reliability and IC lifetime
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Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-ISA153V1 -- 12 V, 15 W (20 W peak) isolated flyback converter based on the VIPER38LE 
STEVAL-ISA182V1 ST 8.4 W / 30 W peak power offline flyback converter using VIPER38HD Part Number12 V, 15 W (20 W peak) isolated flyback converter based on the VIPER38LE
8.4 W / 30 W peak power offline flyback converter using VIPER38HD
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| VIPER38HD | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER38HDTR | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER38HE | Active | SDIP 10 | Industrial | Ecopack2 | |
| VIPER38LD | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER38LDTR | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER38LE | Active | SDIP 10 | Industrial | Ecopack2 | |
VIPER38HE
Package:
SDIP 10Material Declaration**:
VIPER38LE
Package:
SDIP 10Material Declaration**:
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
eDesignSuite
Sample & Buy
| Part Number | Order from Distributors | Order from ST | Package | Packing Type | Marketing Status | RDS(on) (Ω) (max) | Transistor Breakdown Voltage (V) (min) | Drain Current (A) (nom) | ECCN (US) | Country of Origin | Budgetary Price (US$)*/Qty | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VIPER38LD | 3 distributors | Get sample | SO-16 | Tube | Active | 4.5 | 800 | 1.15 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER38LE | 1 distributors | Buy now | SDIP 10 | Tube | Active | 4.5 | 800 | 1.15 | EAR99 | CHINA | 0.485 / 1k | |
| VIPER38HD | 1 distributors | Get sample | SO-16 | Tube | Active | 4.5 | 800 | 1.15 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER38LDTR | 3 distributors | Get sample | SO-16 | Tape And Reel | Active | 4.5 | 800 | 1.15 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER38HDTR | 2 distributors | Get sample | SO-16 | Tape And Reel | Active | 4.5 | 800 | 1.15 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER38HE | 1 distributors | Get sample | SDIP 10 | Tube | Active | 4.5 | 800 | 1.15 | EAR99 | CHINA | 0.485 / 1k |
(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
