STMicroelectronics VIPER267KDTR

Overview

VIPER267KDTR from STMicroelectronics is a high-voltage offline PWM controller IC integrating a 1050 V avalanche-rugged N-channel power MOSFET, current-mode PWM control, embedded HV startup, and sense-FET - designed for ultra-wide-input (85–440 VAC) flyback, buck, and buck-boost SMPS. It delivers up to 12 W in open-frame designs, supports primary-side regulation and optocoupler-based isolation, and achieves <30 mW standby power at 230 VAC.

For engineers reviewing the VIPER267KDTR datasheet, VIPER267KDTR pinout, VIPER267KDTR application, or VIPER267KDTR equivalent, key selection criteria include its 700 mA drain current limit, 60 kHz ±4 kHz jittered switching frequency, 3.3 V internal error amplifier reference, burst-mode operation under light load, and SO-16N package thermal performance with R_TH-JC = 5 °C/W (with 100 mm² copper).

Technical Context

The VIPER267KDTR implements a current-mode PWM architecture with cycle-by-cycle drain current sensing via an integrated sense-FET, enabling precise overcurrent protection at 700 mA (typ). Its oscillator generates a fixed 60 kHz switching frequency with ±4 kHz spread-spectrum modulation at 240 Hz to reduce EMI peak emissions.

Startup is managed by an internal high-voltage current source drawing from the DRAIN pin (V_{HV_START} = 38–60 V), eliminating external startup resistors. The controller includes a transconductance error amplifier (G_M = 2 mA/V), soft-start (t_SS = 8.5 ms), hysteretic thermal shutdown (T_SD = 150–160 °C), and auto-restart logic with 1 s fault recovery delay.

Key Specifications

Pinout & Package

Package: SO-16N (16-pin small outline, exposed metal pad for thermal dissipation; R_TH-JC = 5 °C/W with 100 mm² Cu).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage offline SMPS controller applications.

Compared with ICE3B0565J and LNK364PG, the VIPER267KDTR uniquely combines 1050 V ruggedness, jittered EMI reduction, and sense-FET current sensing - making it the only option capable of single-chip 440 VAC operation with certified low-noise performance and cycle-by-cycle protection.

Availability

VIPER267KDTR is available at Aetrix Electronics and suitable for energy metering, industrial auxiliary supplies, LED lighting drivers, and smart HVAC control requiring stable component supply across extended input voltage ranges and long product lifecycles.

Supply support for VIPER267KDTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, microcontrollers, and analog ICs for industrial, automotive, and consumer applications.

The VIPER™ family targets highly integrated, low-component-count AC/DC conversion - specifically engineered to replace multi-chip solutions in universal-input offline SMPS with enhanced safety, efficiency, and regulatory compliance.

FAQ

What is the maximum continuous output power achievable with VIPER267KDTR in an open-frame design?

At 50 °C ambient with adequate heatsinking, the VIPER267KDTR delivers up to 12 W in open-frame configurations using flyback topology. This is validated per ST's DS12978 Rev 1, Table 8, and assumes SO-16N mounting on FR4 with 100 mm² copper area. Power scales with thermal design - derating applies above 50 °C ambient or with reduced copper area.

Does VIPER267KDTR support primary-side regulation without an optocoupler?

Yes. The device supports primary-side regulation (PSR) using the DRAIN voltage waveform for output voltage sensing. Its internal circuitry samples reflected voltage during MOSFET off-time, enabling regulation accuracy within ±5% without secondary-side feedback components - confirmed in Section 5.1 and Figure 27 of the official datasheet.

How does the burst mode function reduce audible noise in LED lighting applications?

Burst mode lowers the average switching frequency to a few hundred Hz under light load, moving energy away from the 20–20 kHz audible band. Combined with reduced drain current limit (127 mA in burst vs. 700 mA normal), it suppresses magnetostrictive vibration in transformers and inductors - a documented design benefit for silent LED drivers per Section 4.9 of DS12978.

Can VIPER267KDTR be used in buck-boost topology with 440 VAC input?

Yes. The 1050 V drain rating and ultra-wide input capability explicitly support buck-boost operation up to 440 VAC, as shown in Figure 29 of the datasheet. Design requires proper DRAIN snubber sizing and attention to gate drive timing - but no topology limitation exists beyond the 1050 V absolute maximum rating.