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The device is a high voltage converter, which smartly integrates an 800 V rugged power MOSFET with a quasi-resonant current mode PWM control. This IC meets severe energy saving standards as it has very low consumption and operates in burst mode under light load conditions.
The device features the brown-out enabling the IC to set the switch-off and switch-on threshold independently one of each other. The quasi-resonant operation reduces the level of EMI and the quantity of components in the application.
The quasi-resonant operation reduces the switching losses and improves power conversion efficiency. The device features high level protections such as: 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 senseFET
- Built-in soft-start
- Quasi-resonant current mode PWM controller with drain current limit (IDlim)
- Multifunction ZCD pin:
- Zero-current detection
- OCP threshold (IDlim) setup
- Output OVP (auto-restart)
- Feed-forward compensation
- Support isolated flyback topology with opto-coupler
- Frequency limit:
- 136 kHz (L type), 225 kHz (H type)
- Less than 30 mW @ 230 VAC in no-load condition
- Brown-out set through resistor divider
- Short-circuit protection (auto-restart)
- Hysteretic thermal shutdown
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Picture Part number Manufacturer Description 
STEVAL-ISA171V1 ST 12 V - 15 W quasi resonant flyback converter based on the VIPER35HD 
STEVAL-ISA183V1 ST 16 W triple output quasi resonant flyback converter for air conditioning applications using VIPer35LD Part Number12 V - 15 W quasi resonant flyback converter based on the VIPER35HD
16 W triple output quasi resonant flyback converter for air conditioning applications using VIPer35LD
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| VIPER35HD | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER35HDTR | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER35HE | Active | SDIP 10 | Industrial | Ecopack2 | |
| VIPER35LD | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER35LDTR | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER35LE | Active | SDIP 10 | Industrial | Ecopack2 |
VIPER35HD
Package:
SO-16Material Declaration**:
VIPER35HDTR
Package:
SO-16Material Declaration**:
VIPER35HE
Package:
SDIP 10Material Declaration**:
VIPER35LD
Package:
SO-16Material Declaration**:
VIPER35LDTR
Package:
SO-16Material 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.
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VIPER35HD | 2 distributors | Get sample | SO-16 | Tube | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER35LE | No availability of distributors reported, please contact our sales office | Buy now | SDIP 10 | Tube | Active | 4.5 | 800 | 1 | EAR99 | CHINA | 0.485 / 1k | |
| VIPER35LD | 1 distributors | Buy now | SO-16 | Tube | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER35HDTR | 3 distributors | Get sample | SO-16 | Tape And Reel | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER35HE | No availability of distributors reported, please contact our sales office | Buy now | SDIP 10 | Tube | Active | 4.5 | 800 | 1 | EAR99 | CHINA | 0.485 / 1k | |
| VIPER35LDTR | 2 distributors | Get sample | SO-16 | Tape And Reel | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 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
