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This device is an offline converter with an 800 V rugged power section, a PWM control, two levels of overcurrent protection, overvoltage and overload protection, hysteretic thermal protection, soft-start, and safe auto-restart after the removal of any fault condition. Burst mode operation and very low device consumption help to meet the standby energy saving regulations. Advance frequency jittering reduces EMI filter costs. Brownout 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 startup circuit is embedded in the device.
Key Features
- 800 V avalanche-rugged power MOSFET allowing ultra wide range input Vacto be achieved
- PWM operation with adjustable limiting current
- 30 mW standby power at 265 Vac
- Operating frequency:
- Frequency jittering for low EMC
- Output overvoltage protection
- High primary current protection (2nd OCP)
- Input undervoltage setting (brownout)
- Onboard soft-start
- Safe auto-restart after a fault condition
- Hysteretic thermal shutdown
Featured Videos
Evaluation Tools
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Picture Part number Manufacturer Description 
STEVAL-ISA121V1 -- Wide range single-output demonstration board based on the VIPER37LE 
STEVAL-ISA140V1 ST 15W, 12V output, isolated flyback converter using VIPer™ Plus - VIPER37HE 
STEVAL-ISA184V1 ST 5V/1.2A 12V/750mA double output flyback converter using VIPER37LD 
STEVAL-ISA191V1 ST 5 V - 12 V, 15 W double output isolated flyback converter based on VIPer37LE Part NumberWide range single-output demonstration board based on the VIPER37LE
15W, 12V output, isolated flyback converter using VIPer™ Plus - VIPER37HE
5V/1.2A 12V/750mA double output flyback converter using VIPER37LD
5 V - 12 V, 15 W double output isolated flyback converter based on VIPer37LE
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Quality and Reliability
| Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
|---|---|---|---|---|---|
| VIPER37HD | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER37HDTR | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER37HE | Active | SDIP 10 | Industrial | Ecopack2 | |
| VIPER37LD | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER37LDTR | Active | SO-16 | Industrial | Ecopack2 | |
| VIPER37LE | Active | SDIP 10 | Industrial | Ecopack2 |
VIPER37HE
Package:
SDIP 10Material Declaration**:
VIPER37LD
Package:
SO-16Material Declaration**:
VIPER37LDTR
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.
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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| VIPER37HDTR | 2 distributors | Get sample | SO-16 | Tape And Reel | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER37LD | 2 distributors | Get sample | SO-16 | Tube | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER37LDTR | 3 distributors | Get sample | SO-16 | Tape And Reel | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER37LE | 5 distributors | Get sample | SDIP 10 | Tube | Active | 4.5 | 800 | 1 | EAR99 | CHINA | 0.485 / 1k | |
| VIPER37HD | 3 distributors | Get sample | SO-16 | Tube | Active | 4.5 | 800 | 1 | EAR99 | THAILAND | 0.464 / 1k | |
| VIPER37HE | 2 distributors | Get sample | SDIP 10 | Tube | Active | 4.5 | 800 | 1 | 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
