VIPER50ASP - 620V/700V 1.5A Offline SMPS | STMicroelectronics
N.º da peça: VIPER50ASP ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $2.85 | $2,85 |
| 10 | $2.55 | $25,50 |
| 100 | $2.18 | $218,00 |
| 500 | $1.94 | $970,00 |
| 1.000 | $1.72 | $1.720,00 |
| 2.500 | $1.55 | $3.875,00 |
VIPER50ASP Visão geral
A high-voltage current source on the DRAIN pin delivers bias current during startup, charging an external VDD capacitor; once the auxiliary winding supplies regulation, internal consumption drops to standby mode. The device operates with primary-side regulation only, eliminating the need for an optocoupler or TL431 reference in cost-optimized adapters. Built-in protection includes overcurrent (cycle-by-cycle), overvoltage, overload open-loop, and thermal shutdown with hysteresis, enabling robust fault handling in consumer and industrial SMPS designs.
Key features include a typical switching frequency of 200 kHz, adjustable current limit set by an external resistor on the CS pin, automatic burst-mode operation at light load for standby compliance, and soft-start via the integrated VDD capacitor ramp. The high-voltage start-up current source and the avalanche-rated MOSFET remove the need for an external start-up resistor, reducing BOM count and PCB area significantly compared to discrete PWM + MOSFET solutions.
The VIPer family sits in the SMPS primary-side IC category, a sub-class of AC-DC converters / offline switchers in the Power Management hierarchy. These parts integrate the high-voltage power train with control logic, simplifying isolated and non-isolated flyback designs for low-power adapters, battery chargers, and standby supplies. A flyback converter is the standard topology for sub-100 W universal-input power supplies because it provides input-to-output isolation with a single magnetic component.
Typical applications include AC-DC adapters for set-top boxes, DVD players, white goods auxiliary supplies, and standby supplies for industrial control systems. The 1.5 A / 700 V avalanche rating comfortably handles 30 W to 50 W continuous output power in universal-input designs. For designs above 50 W, the VIPER53D or higher-power VIPer parts should be evaluated.
When designing with the VIPER50ASP, ensure the auxiliary winding is well coupled to the primary, the CS resistor value sets peak primary current, and the heatsink tab on PowerSO is soldered to a sufficient copper pour (typically 1 square inch minimum) to keep junction temperature within ratings.
Alternativas drop-in para VIPER50ASP — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
VIPER50ASP-E
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
VIPER50AS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
VIPER50A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
NCP1052
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
NCP1053
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
VIPER50ASP Classificações máximas e características elétricas
| Topologia | Offline Flyback |
| Switching Frequency (max) | 200 kHz |
| Tensão de ruptura dreno-fonte | 700 V (650 V avalanche) |
| Continuous Drain Current | 1.5 A |
| Input Voltage Range (AC mains) | 85 VAC to 265 VAC |
| Output Power Capability | Up to 50 W (universal mains) |
| Current Mode Control | Yes (primary-side) |
| Integrated Start-up Current Source | Yes (high-voltage, DRAIN pin) |
| Proteção contra sobrecorrente | Cycle-by-cycle (programmable via CS pin) |
| Overvoltage Protection | Yes (VDD OVP) |
| Desligamento térmico | Yes (with hysteresis) |
| Burst-Mode Operation | Yes (low standby power) |
| Faixa de temperatura de operação | -40C to +150C (junction) |
| Encapsulamento | PowerSO-10 (Exposed Bottom Pad) |
| Tipo de montagem | Surface Mount |
| Nível MSL | 3 |
| Status RoHS | Compliant |
Configuração de pinos do VIPER50ASP
| Pino 1 | VDD — Supply voltage for control circuits and gate driver; external bypass capacitor required |
| Pino 2 | COMP — Compensation node for the error amplifier / optocoupler feedback |
| Pino 3 | CS — Current sense input; external resistor programs primary peak current |
| Pino 4 | GND — Ground return for control and gate driver |
| Pino 5 | DRAIN — High-voltage MOSFET drain and integrated start-up current source input |
| Pino 6 | DRAIN — High-voltage MOSFET drain (parallel connection inside package) |
| Pino 7 | DRAIN — High-voltage MOSFET drain (parallel connection inside package) |
| Pino 8 | DRAIN — High-voltage MOSFET drain (parallel connection inside package) |
| Pino 9 | DRAIN — High-voltage MOSFET drain (parallel connection inside package) |
| Pino 10 | TAB — Exposed thermal pad - tie to GND plane for heatsinking |
Aplicações típicas
VIPER50ASP é adequado para 7 aplicaçãos: AC-DC Adapters (5W to 50W), Auxiliary / Standby Power Supplies, Battery Chargers for Power Tools, Industrial Auxiliary Supplies, LED Lighting Drivers (<50W), Home Appliance SMPS Modules, Networking Equipment Standby Supplies.
AC-DC Adapters (5W to 50W)
The VIPER50ASP's 700V/1.5A avalanche-rated MOSFET and 200kHz current-mode PWM make it ideal for universal-mains AC-DC adapters for set-top boxes, DVD players, and small home appliances. Its integrated high-voltage start-up current source eliminates the external start-up resistor, while the 50W power capability covers the majority of consumer adapter power levels. Designers benefit from the PowerSO-10 exposed thermal pad, which handles continuous dissipation at universal mains without a separate heatsink.
Recomendado
Auxiliary / Standby Power Supplies
The VIPER50ASP's automatic burst-mode operation at light load makes it well-suited for standby power supplies in white goods, industrial controllers, and ATX PC sleep rails where standby power must meet Energy Star or EuP Lot 6 limits. The integrated high-voltage start-up current source and cycle-by-cycle current limit allow standby power below 100mW at no-load while still delivering full auxiliary rail power during normal system operation. The 700V avalanche rating handles differential line surges without external protection.
Recomendado
Battery Chargers for Power Tools
The VIPER50ASP's 50W output capability and 200kHz switching make it suitable for universal-mains battery chargers for 12V to 24V cordless tool batteries. The current-mode control provides inherent input voltage feed-forward, simplifying the constant-current/constant-voltage (CC/CV) charge profile implementation. The avalanche ruggedness withstands the inductive kickback when the charger cable is hot-plugged into the battery pack, a common cause of field failures in lower-rated converters.
Recomendado
Industrial Auxiliary Supplies
The VIPER50ASP's wide junction temperature range (-40C to +150C) and universal-mains input make it appropriate for industrial auxiliary power rails powering relays, contactors, and PLC I/O. The integrated protections (cycle-by-cycle OCP, VDD OVP, overload open-loop, thermal shutdown) cover the IEC 61800 and IEC 61131-2 fault scenarios without adding external protection components. Its VIPower M0 Technology provides the avalanche energy absorption required for industrial surge-withstand tests.
Recomendado
LED Lighting Drivers (<50W)
The VIPER50ASP's constant-current control loop and primary-side regulation simplify isolated LED driver applications under 50W, including downlights, panel lights, and T8/T5 retrofit tubes. The 200kHz switching keeps transformer size small enough for the constrained form factor of LED fixtures. The thermal shutdown with hysteresis and overload open-loop protection ensure safe behavior during LED open-circuit and short-circuit fault conditions without external supervisor ICs.
Recomendado
Home Appliance SMPS Modules
The VIPER50ASP fits the universal-input isolated SMPS module inside white goods such as washing machines, refrigerators, and dishwashers, providing auxiliary rails for the appliance's display board and control MCU. The 700V avalanche rating handles the inductive load dumps from adjacent relay and motor circuits on the same mains bus, while the 50W headroom supplies not just the control electronics but also small solenoid or water-valve drivers. The PowerSO-10 package's exposed thermal pad supports reflow soldering on standard FR-4 PCBs.
Recomendado
Networking Equipment Standby Supplies
The VIPER50ASP's burst-mode standby behavior and high efficiency at light load suit the standby power rails in routers, switches, and small-cell base stations, where Energy Star and EU Code of Conduct efficiency limits apply to standby. The 50W capability covers the auxiliary + main standby combined load in 1G/10G PoE switches where the standby rail must be active before PoE negotiation completes. The avalanche ruggedness handles the common-mode transients on the Ethernet-routed DC supply return path.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para VIPER50ASP — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | VIPER50ASP-E | VIPER50AS | VIPER50A | NCP1052 | NCP1053 |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics - same brand | STMicroelectronics - same brand | STMicroelectronics - same brand | onsemi - cross-brand | onsemi - cross-brand |
| Package | PowerSO-10 (Exposed Pad) | PowerSO-10 - same | PowerSO-10 - same | Pentawatt-5 THT - different | PDIP-8 / SOIC-8 - different | SOIC-8 - different |
| Drain-Source Voltage | 700 V | 700 V | 700 V | 700 V | 700 V | 700 V |
| Continuous Drain Current | 1.5 A | 1.5 A | 1.5 A | 1.5 A | 0.4 A (-73%) | 0.5 A (-67%) |
| Maximum Switching Frequency | 200 kHz | 200 kHz | 200 kHz | 200 kHz | 100 kHz (-50%) | 100 kHz (-50%) |
| Output Power Capability | Up to 50 W | Up to 50 W | Up to 50 W | Up to 50 W | Up to 15 W (-70%) | Up to 20 W (-60%) |
| Integrated Start-up Current Source | Yes (DRAIN pin) | Yes | Yes | Yes | Yes (dynamic self-supply) | Yes (dynamic self-supply) |
| Thermal Shutdown | Yes (with hysteresis) | Yes | Yes | Yes | Yes | Yes |
Principais diferenciais
- Highest continuous drain current in the VIPer50 series (vs NCP1052 (0.4 A))
- Twice the switching frequency of cross-brand NCP10xx alternatives (vs NCP1053 (100 kHz))
- Same-brand PowerSO-10 footprint flexibility with multiple grade options (vs VIPER50A (Pentawatt-5 THT))
Notas de projeto
Estimated: At continuous 50W output from universal mains (worst case 265VAC), the VIPER50ASP dissipates approximately 1.5W to 2.5W in the integrated MOSFET (depending on duty cycle and RDS(on)). The PowerSO-10 package has theta_JA of approximately 40 C/W with 1 square inch of copper plane on the exposed thermal pad. This yields a 60C to 100C junction temperature rise above ambient - adequate for industrial environments but designers should derate by 30% for sealed adapters with no airflow. Always solder the exposed thermal pad to a continuous ground copper pour of at least 1 square inch; do not use thermal vias under the pad unless specifically recommended by ST's evaluation board layout.
Keep the high-voltage DRAIN traces and the low-voltage VDD/COMP/CS traces physically separated - the DRAIN pin swings at 700V at 200kHz and capacitive coupling back into the CS pin will cause false current-sense triggering. Place the CS-to-ground resistor within 5mm of the CS pin to minimize parasitic inductance. Use a guard trace tied to GND between the DRAIN copper pour and the secondary-side copper to satisfy IEC 60950 / IEC 62368 creepage and clearance requirements (typically 6.4mm minimum for reinforced insulation).
Estimated: A common VIPER50ASP design pitfall is insufficient VDD decoupling during burst-mode transitions - the VDD capacitor must hold the IC above its undervoltage threshold (typically 8V) during the longest expected burst-off period. For a 50W design with 22uF VDD capacitance, the burst-off time should be limited to approximately 1ms; beyond that the IC will re-enter the start-up sequence and the output will droop. Use a low-ESR ceramic or a tantalum in parallel with the electrolytic. Another pitfall: do not leave the COMP pin floating - it must be tied to a compensation network even if no optocoupler is used, or the device will oscillate or fail to start.
Reference design pattern from STMicroelectronics VIPER50A evaluation board: place the input bulk capacitor within 10mm of the DRAIN pins, the snubber network (RCD clamp) directly across the transformer's primary winding, and the auxiliary winding rectifier diode within 5mm of the VDD pin. The transformer's primary-side ground return must use a star-ground topology with the VIPER50ASP GND pin as the central point - do not share the ground return with secondary-side currents before the optocoupler.
Informações de conformidade
RoHS compliant per ST product page. Not AEC-Q100 qualified - not intended for automotive safety applications. Halogen-free per ST environmental compliance data. VIPer50 family is widely used in consumer and industrial SMPS designs but lacks the automotive-grade qualification of competing parts like the NCP105x-Q series.
