STMicroelectronics EVLVIP17-5WCHG

Overview

EVLVIP17-5WCHG from STMicroelectronics is a 5 W flyback-based demonstration board for travel battery chargers targeting mobile phones, PDAs, and handheld electronic games. It implements constant voltage/constant current (CV/CC) regulation using the VIPER17HN high-voltage converter (800 V MOSFET, 115 kHz fixed switching frequency) on the primary side and the TSM1052 CV/CC controller (SOT23-6L, 1.7 V min supply) on the secondary side. The board achieves <100 mW no-load input power, EN60065 safety compliance, and EN55022 Class B EMI performance without a Y1 safety capacitor.

For engineers reviewing the EVLVIP17-5WCHG datasheet, EVLVIP17-5WCHG application, EVLVIP17-5WCHG bill of materials, or EVLVIP17-5WCHG equivalent evaluation boards, this page provides verified technical context, key specifications, availability support, and manufacturer-specific design rationale - all grounded in ST's AN2840 application note and component-level validation.

Technical Context

The EVLVIP17-5WCHG uses a flyback topology with VIPER17HN (DIP-7, 800 V avalanche-rugged MOSFET, internal 115 kHz oscillator with ±8 kHz jitter) operating in both continuous and discontinuous conduction modes depending on input voltage (90–264 V_RMS) and load. Its self-supply winding feeds the VIPER17HN's VDD pin across an 8.5–23 V range, enabling stable startup and burst-mode operation at light loads.

Secondary-side regulation relies on the TSM1052 (SOT23-6L), supplied directly from the 5.1 V output, delivering precise CV/CC control down to 1.5 V output while enabling cable drop compensation (0.2 V/A) via matched R7/R9 resistors. Short-circuit protection triggers hiccup mode with auto-restart, and OLP activation occurs when FB pin voltage reaches 4.8 V after ~8 ms.

Key Specifications

Availability

EVLVIP17-5WCHG is available at Aetrix Electronics and suitable for mobile device charger development, low-power AC/DC reference design validation, and energy-efficient adapter qualification requiring stable component supply, traceable sourcing, and lifecycle continuity.

Supply support for EVLVIP17-5WCHG 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, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer applications.

The EVLVIP17-5WCHG belongs to ST's VIPer+ evaluation platform family, developed specifically to accelerate adoption of highly integrated, low-standby-power SMPS ICs for compact, cost-sensitive battery charging adapters.

FAQ

What is the primary function of the EVLVIP17-5WCHG board?

The EVLVIP17-5WCHG is a fully assembled, tested demonstration board that implements a 5 W isolated flyback charger with constant voltage and constant current regulation. It serves as a turnkey reference design for engineers developing compact, low-standby-power AC/DC adapters for mobile devices - not a production-ready end-product, but a validated starting point for layout, thermal, and compliance testing.

Does the board include the VIPER17HN and TSM1052 ICs?

Yes - the EVLVIP17-5WCHG integrates the VIPER17HN (DIP-7 package) on the primary side and the TSM1052CLT (SOT23-6L package) on the secondary side, both mounted and functional per ST's AN2840 schematic and bill of materials. These ICs are essential to its CV/CC regulation, burst-mode no-load operation, and Y-cap-free isolation architecture.

Can the EVLVIP17-5WCHG be used for USB charging applications?

Yes - its 5.1 V ±2% output and 1 A ±5% current capability meet standard USB 2.0 charging requirements. The built-in cable drop compensation (0.2 V/A) ensures stable 5 V delivery at the load end, and its EN55022 Class B compliance supports CE-marked consumer product integration without additional EMI filtering.

Is the transformer custom-wound, and what core does it use?

Yes - the TR1 transformer uses a standard EF12.6 ferrite core and employs a proprietary winding technique that eliminates the need for a Y1 safety capacitor between primary and secondary. This layer-wound construction achieves reinforced isolation while reducing BOM cost and EMI filter complexity, as confirmed in AN2840 Section 1 and Bill of Materials Table 6.