TNY274-280 TinySwitch-III Family Energy-Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range Product Highlights + + DC Lowest System Cost with Enhanced Flexibility Output Simple ON/OFF control, no loop compensation needed Selectable current limit through BP/M capacitor value Wide-Range Higher current limit extends peak power or, in open D High-Voltage EN/UV frame applications, maximum continuous power DC Input BP/M Lower current limit improves efficiency in enclosed TinySwitch-III adapters/chargers S Allows optimum TinySwitch-III choice by swapping devices with no other circuit redesign PI-4095-082205 2 Tight I f parameter tolerance reduces system cost Figure 1. Typical Standby Application. Maximizes MOSFET and magnetics power delivery Minimizes max overload power, reducing cost of transformer, primary clamp & secondary components Output Power Table ON-time extension extends low line regulation range/hold-up time to reduce input bulk capacitance 230 VAC 15% 85-265 VAC Self-biased: no bias winding or bias components 3 Peak or Peak or Product Frequency jittering reduces EMI filter costs 1 1 Adapter Open Adapter Open 2 2 Pin-out simplifies heatsinking to the PCB Frame Frame SOURCE pins are electrically quiet for low EMI TNY274P/G 6 W 11 W 5 W 8.5 W TNY275P/G 8.5 W 15 W 6 W 11.5 W Enhanced Safety and Reliability Features TNY276P/G 10 W 19 W 7 W 15 W Accurate hysteretic thermal shutdown protection with automatic recovery eliminates need for manual reset TNY277P/G 13 W 23.5 W 8 W 18 W Improved auto-restart delivers <3% of maximum power in TNY278P/G 16 W 28 W 10 W 21.5 W short-circuit and open loop fault conditions TNY279P/G 18 W 32 W 12 W 25 W Output overvoltage shutdown with optional Zener TNY280P/G 20 W 36.5 W 14 W 28.5 W Line undervoltage detect threshold set using a single optional resistor Table 1. Output Power Table. Very low component count enhances reliability and enables Notes: single-sided printed circuit board layout 1. Minimum continuous power in a typical non-ventilated enclosed adapter measured at +50 C ambient. Use of an external heat sink will increase power High bandwidth provides fast turn on with no overshoot and capability. excellent transient load response 2. Minimum peak power capability in any design or minimum continuous power in Extended creepage between DRAIN and all other pins improves an open frame design (see Key Applications Considerations). 3. Packages: P: DIP-8C, G: SMD-8C. See Part Ordering Information. field reliability EcoSmart Extremely Energy Efficient Description Easily meets all global energy efficiency regulations No-load <150 mW at 265 VAC without bias winding, <50 mW TinySwitch-III incorporates a 700 V power MOSFET, oscillator, with bias winding high-voltage switched current source, current limit (user ON/OFF control provides constant efficiency down to very light selectable) and thermal shutdown circuitry. The IC family uses an loads ideal for mandatory CEC regulations and 1 W PC ON/OFF control scheme and offers a design flexible solution with standby requirements a low system cost and extended power capability. Applications Chargers/adapters for cell/cordless phones, PDAs, digital cameras, MP3/portable audio, shavers, etc. PC Standby and other auxiliary supplies DVD/PVR and other low power set top decoders Supplies for appliances, industrial systems, metering, etc. www.power.com December 2021 This Product is Covered by Patents and/or Pending Patent Applications.TNY274-280 BYPASS/ MULTI-FUNCTION DRAIN (BP/M) (D) REGULATOR 5.85 V LINE UNDER-VOLTAGE 115 A 25 A FAULT BYPASS PIN PRESENT UNDER-VOLTAGE + AUTO- BYPASS - RESTART CAPACITOR 5.85 V COUNTER SELECT AND V I 4.9 V LIMIT CURRENT RESET LIMIT STATE MACHINE CURRENT LIMIT COMPARATOR ENABLE JITTER CLOCK 1.0 V + V ENABLE/ T THERMAL DC MAX UNDER- SHUTDOWN VOLTAGE (EN/UV) OSCILLATOR S Q 1.0 V R Q 6.4 V LEADING EDGE OVP BLANKING LATCH SOURCE (S) PI-4077-072115 Figure 2. Functional Block Diagram. Pin Functional Description P Package (DIP-8C) DRAIN (D) Pin: G Package (SMD-8C) This pin is the power MOSFET drain connection. It provides internal operating current for both start-up and steady-state operation. EN/UV 1 8 S BYPASS/MULTI-FUNCTION (BP/M) Pin: BP/M 2 7 S This pin has multiple functions: 6 S 1. It is the connection point for an external bypass capacitor for D 4 5 S the internally generated 5.85 V supply. 2. It is a mode selector for the current limit value, depending on the value of the capacitance added. Use of a 0.1 mF capacitor results in the standard current limit value. Use of a PI-4078-080905 1 mF capacitor results in the current limit being reduced to that of the next smaller device size. Use of a 10 mF capacitor Figure 3. Pin Configuration. results in the current limit being increased to that of the next larger device size for TNY275-280. ENABLE/UNDERVOLTAGE (EN/UV) Pin: 3. It provides a shutdown function. When the current into the This pin has dual functions: enable input and line undervoltage bypass pin exceeds I , the device latches off until the sense. During normal operation, switching of the power SD BP/M voltage drops below 4.9 V, during a power down. This MOSFET is controlled by this pin. MOSFET switching is can be used to provide an output overvoltage function with a terminated when a current greater than a threshold current is Zener connected from the BP/M pin to a bias winding supply. drawn from this pin. Switching resumes when the current being 2 Rev. N 12/21 www.power.com + -