Obsolete Product Not Recommended for New Designs TNY375-380 TinySwitch-PK Family Energy-Efficient, Off-Line Switcher With Enhanced Peak Power Performance Product Highlights Lowest System Cost with Enhanced Flexibility + AC IN Simple ON/OFF control, no loop compensation needed DC OUT Unique Peak Mode feature extends power range without increasing transformer size Maximum frequency and current limit boosted at peak loads Selectable current limit through BP/M capacitor value Higher current limit extends maximum power in open frame Lower current limit improves efficiency in enclosed adapters DD EN/UV Allows optimum TinySwitch-PK choice by swapping devices TinySwitch-PK BP/M with no other circuit redesign 2 S Tight I f parameter tolerance reduces system cost Maximizes MOSFET and magnetics power delivery PI-4266-012009 ON time extension typically extends low line regulation range/ hold-up time to reduce input bulk capacitance Figure 1. Typical Peak Power Application. Self-biased: no bias winding required for TNY375-376 winding required for TNY377-380 Frequency jittering reduces EMI filter costs Output Power Table Optimized pin out eases pcb/external heat sinking 230 VAC 15% 85-265 VAC Quiet source-connected heat sink pins for low EMI 3 Product Open Open 1 1 Adapter Peak Adapter Peak 2 2 Frame Frame Enhanced Safety and Reliability Features 4 Accurate hysteretic thermal shutdown with automatic recovery TNY375P/G/D 8.5 W 15 W 16.5 W 6 W 11.5 W 12.5 W provides complete system level overload protection and 4 TNY376P/G/D 10 W 19 W 22 W 7 W 15 W 17 W eliminates need for manual reset TNY377P/G 13 W 23.5 W 28 W 8 W 18 W 23 W Auto-restart delivers <3% maximum power in short circuit and TNY378P/G 16 W 28 W 34 W 10 W 21.5 W 27 W open loop fault conditions TNY379P/G 18 W 32 W 39 W 12 W 25 W 31 W Output overvoltage shutdown with optional Zener Line undervoltage detect threshold set using a single resistor TNY380P/G 20 W 36.5 W 45 W 14 W 28.5 W 35 W Very low component count enhances reliability and enables Table 1. Output Power Table. single sided printed circuit board layout Notes: High bandwidth provides fast turn on with no overshoot and 1. Minimum continuous power in a typical non-ventilated enclosed adapter excellent transient load response measured at +50 C ambient. Use of an external heat sink will increase power capability. Extended creepage between DRAIN and all other pins improves 2. Minimum continuous power in an open frame design (see Key Applications field reliability Considerations). 3. Packages: P: DIP-8C, G: SMD-8C, D: SO-8C. Lead free only. See Part Ordering EcoSmart Extremely Energy Efficient Information. Easily meets all global energy efficiency regulations 4. See Key Application Considerations. No-load <170 mW at 265 VAC without bias winding, <60 mW with bias winding ON/OFF control provides constant efficiency down to very light Description loads ideal for mandatory CEC efficiency regulations and 1 W PC standby requirements TinySwitch-PK incorporates a 700 V MOSFET, oscillator, high- Applications voltage switched current source, current limit (user selectable), Applications with high peak-to-continuous power demands and thermal shutdown circuitry. A unique peak mode feature DVDs, PVRs, active speakers (e.g. PC audio), audio amplifiers, boosts current limit and frequency for peak load conditions. The modems, photo printers boosted current limit provides the peak output power while the Applications with high power demands at startup (large output increased peak mode frequency ensures the transformer can be capacitance or motor loads) PC standby, low voltage motor sized for continuous load conditions rather than peak power drives demands. www.powerint.com September 2012TNY375-380 BYPASS/ DRAIN MULTI-FUNCTION (D) (BP/M) 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 LIMIT 4.9 V CURRENT RESET LIMIT STATE MACHINE CURRENT LIMIT COMPARATOR ENABLE JITTER 2X CLOCK 1.0 V + V T THERMAL DC MAX SHUTDOWN OSCILLATOR S Q ENABLE/ 1.0 V UNDER- VOLTAGE R Q (EN/UV) 6.4 V LEADING OVP EDGE LATCH BLANKING RESET SOURCE (S) PI-4550-121406 Figure 2 Functional Block Diagram. Pin Functional Description DRAIN (D) Pin: P Package (DIP-8C) This pin is the power MOSFET drain connection. It provides G Package (SMD-8C) internal operating current for both start-up and steady-state D Package (SO-8C) operation. BYPASS/MULTI-FUNCTION (BP/M) Pin: EN/UV 1 8 S This pin has multiple functions: 2 BP/M 7 S 1. It is the connection point for an external bypass capacitor for the internally generated 5.85 V supply. 6 S 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 D 4 5 S capacitor results in the standard current limit value. Use of a 1 mF capacitor results in the current limit being reduced to PI-4348-042809 that of the next smaller device size. Use of a 10 mF capacitor results in the current limit being increased to that of the next Figure 3. Pin Configuration. larger device. 3. It provides a shutdown function. When the current into the ENABLE/UNDERVOLTAGE (EN/UV) Pin: bypass pin exceeds 7 mA, the device latches off until the This pin has dual functions: enable input and line undervoltage BP/M voltage drops below 4.9 V, during a power down or sense. During normal operation, switching of the power when a line undervoltage is detected. This can be used to MOSFET is controlled by this pin. MOSFET switching is provide an output overvoltage function with a Zener diode terminated when a current greater than a threshold current is connected from the BP/M pin to a bias winding supply. drawn from this pin. Switching resumes when the current being 2 Rev. C 09/12 www.powerint.com + -