*mydirectindustry

TinySwitch-PK

Product catalog summary

Overview: The TinySwitch-PK family is an energy-efficient, off-line switcher designed for enhanced peak power performance. It integrates a 700 V MOSFET, oscillator, and control circuits to manage power delivery efficiently.

Output Power Specifications: The document provides an output power table for models TNY375-380 under different voltage conditions (230 VAC ± 15% and 85-265 VAC). Power output varies based on setup type (adapter or open frame), with peak power capabilities listed for each model.

Product Highlights: Key features include low system cost, enhanced flexibility, simple ON/OFF control, and a unique peak mode feature that extends power range without increasing transformer size. The device offers selectable current limits, frequency jittering to reduce EMI, and optimized pin configurations for ease of use.

Safety and Reliability: Features include accurate hysteretic thermal shutdown, auto-restart for fault conditions, output overvoltage shutdown, and line undervoltage detection, enhancing safety and reliability while reducing the need for additional components.

EcoSmart Technology: Designed to meet global energy efficiency regulations, the device has no-load power consumption as low as <170 mW at 265 VAC without a bias winding, and <60 mW with a bias winding.

Applications: Suitable for applications with high peak-to-continuous power demands such as DVDs, PVRs, active speakers, audio amplifiers, modems, and photo printers. Also ideal for applications with high power demands at startup, like PC standby and low voltage motor drives.

Functional Description: The TinySwitch-PK uses a simple ON/OFF control to regulate output voltage, incorporating an oscillator, enable circuit, current limit state machine, and protective circuits. It features adaptive switching cycle on-time extension and line undervoltage sense for improved performance and reliability.

Pin Functional Description: Details the functions of various pins, including DRAIN, BYPASS/MULTI-FUNCTION, ENABLE/UNDERVOLTAGE, and SOURCE pins, explaining their roles in the device's operation.

Technical Features: Includes a 5.85 V regulator, 6.4 V shunt voltage clamp, and current limit circuit with leading edge blanking to prevent premature termination of switching pulses. Features auto-restart and adaptive switching cycle on-time extension to handle fault conditions and improve regulation.

Specifications and Design Considerations: Discusses design considerations for maximum output power, highlighting the importance of selecting the appropriate TinySwitch-PK for the desired power level to ensure the current in the primary inductance ramps up to the current limit before reaching the DC MAX limit.

Enable Function and ON/OFF Operation: Uses the EN/UV pin to determine the switching cycle, influenced by the power supply output voltage compared to a reference voltage. The operation ensures that the output voltage ripple is controlled by the output capacitor and feedback delay.

Power Up/Down and Current Limit Operation: Requires a 0.1 μF capacitor on the BYPASS/MULTI-FUNCTION pin for standard operation. Power-up timing is influenced by an optional external resistor, delaying MOSFET switching until the DC line voltage exceeds a threshold.

BYPASS/MULTI-FUNCTION Pin Capacitor: The capacitor size on the BYPASS/MULTI-FUNCTION pin can adjust the current limit, allowing for optimization based on thermal conditions and power requirements.

Application Examples: An example circuit using a TNY376 demonstrates a low-cost universal AC input power supply with multiple outputs, including components for EMI reduction and voltage regulation.

Key Application Considerations: Provides a table of maximum output power levels under specific conditions, such as input voltage and efficiency, and discusses overvoltage protection using an internal latch triggered by the BYPASS pin.

Figures and Tables: Includes figures illustrating operation modes at different load levels and power-up/down timing, and tables detailing peak output power capabilities for various TinySwitch-PK models under different current limit modes.

Specifications: Outlines the electrical characteristics of the TinySwitch-PK series, including output frequency, maximum duty cycle, and various current limits. Specifies the absolute maximum ratings for voltage, current, and temperature.

Procedures: Key procedures include reducing no-load consumption by using a bias winding, minimizing audible noise through transformer design, and ensuring proper grounding and layout to prevent noise interference.

Recommendations: Recommendations include using single-point grounding, minimizing primary loop area, and maximizing copper areas for heat sinking. Suggests specific resistor values and capacitor types to reduce noise and improve efficiency.

Testing and Verification: A quick design checklist is provided to verify that component specifications are not exceeded under worst-case conditions, including checking maximum drain voltage and current, and conducting thermal checks.

Design Tools: References the Power Integrations website for up-to-date design tools, aiding in the development and testing of TinySwitch-PK designs.

Specifications: Outlines the specifications for the TNY375-380 series, including a breakdown voltage (BV_DSS) of 700 V and a DRAIN supply voltage of 50 V.

Procedures and Recommendations: Recommends using nominal capacitors of 0.1 μF, 1 μF, and 10 μF for the BP/M pin to ensure correct current limits.

Norms and Standards: Package dimensions conform to JEDEC specification MS-001-AB for standard dual-in-line (DIP) packages.

Figures and Graphs: Includes figures illustrating various characteristics such as breakdown voltage vs. temperature, frequency vs. temperature, and current limit vs. di/dt.

Part Ordering Information: Includes ordering information for the TinySwitch product family, specifying series numbers, package identifiers, lead finishes, and options for tape and reel configurations.

Legal and Support Information: Provides a disclaimer regarding the use of products in life support devices and systems, along with contact information for worldwide sales support locations.

Catalog excerpts

Figure 1. Typical Peak Power Application. 230 VAC 15%85-265 VAC Product > 3 Adapter > 1 OpenFrame > 1 OpenFrame > 2 PeakAdapter > 2 PeakTNY375PN/GN 8.5 W15 W16.5 W6 W11.5 W12.5 W TNY376PN/GN 10 W19 W22 W7 W15 W17 W TNY377PN/GN 13 W23.5 W28 W8 W18 W23 W TNY378PN/GN 16 W28 W34 W10 W21.5 W27 W TNY379PN/GN 18 W32 W39 W12 W25 W31 W TNY380PN/GN 20 W36.5 W45 W14 W28.5 W35 W > Table 1. Output Power Table. Notes: 1. Minimum continuous power in a typical non-ventilated enclosed adapter measured at +50 ѰC ambient. Use of an external heatsink will increase power capability.2. Minimum continuous power in an open frame design (see Key Applications Considerations). 3. Packages: P: DIP-8C, G: SMD-8C. Lead free only. See Part Ordering Information.

Open the catalog to page 1

BYPASS/ MULTI-FUNCTION (BP/M) DRAIN (D) REGULATOR 5.85 V BYPASS PIN UNDER-VOLTAGE 1.0 V + V LINE UNDER-VOLTAGE RESET AUTO- RESTART COUNTER 115 A 25 A FAULT PRESENT CURRENT LIMIT COMPARATOR ENABLE > + - BYPASS CAPACITOR SELECT AND CURRENT LIMIT STATE MACHINE 5.85 V 4.9 V SOURCE (S) V > ILIMIT + - JITTER2X CLOCKOSCILLATOR > T DCMAX THERMAL SHUTDOWN ENABLE/ UNDER- VOLTAGE (EN/UV) > S R Q 1.0 V 6.4 V > Q OVP LATCH RESET LEADING EDGE BLANKING > PI-4550-121406 Figure 2 Functional Block Diagram. > PI-4348-111607 Figure 3. Pin Confi guration. >

Open the catalog to page 2

A. When the current out of this pin exceeds the threshold current, a low logic level (disable) is generated at the output of the enable circuit until the current out of this pin is reduced to less than the threshold current. This enable circuit output is sampled at the beginning of each cycle on the rising edge of the clock signal. If high, the power MOSFET is turned on for that cycle (enabled). If low, the power MOSFET remains off (disabled). Since the sampling is done only at the beginning of each cycle, subsequent changes in the EN/UV pin voltage or current during the remainder of the cycle...

Open the catalog to page 3

Adaptive Switching Cycle On-Time Extension Adaptive switching cycle on-time extension keeps the cycle on until current limit is reached, instead of prematurely terminating after the DC Over Temperature Protection > The thermal shutdown circuitry senses the die temperature. The threshold is typically set at 142 C with 75 аC hysteresis. When the die temperature rises above this threshold, the power MOSFET is disabled and remains disabled, until the die temperature falls by 75 C, at which point it is re-enabled. A large hysteresis of 75 аC (typical) is provided to prevent overheating of the PC board...

Open the catalog to page 4

V DRAINV EN CLOCKDCDRAINIMAX > PI-2749-082305 Figure 6. Operation at Near Maximum Loading (f OSC 264 kHz). Figure 7. Operation at Moderately Heavy Loading (f V DRAINV EN CLOCKDCDRAINIMAX V DRAIN V EN CLOCK DC DRAIN I MAX > PI-2667-082305 OSC 264 kHz). PI-4540-050407 Figure 8. Operation at Medium Loading (f OSC 132 kHz).

Open the catalog to page 5

PI-4541-042507 Figure 9. Operation at Very Light Load (f > OSC 132 kHz). VDC-INPUT > PI-2348-030801 VDC-INPUT > PI-4865-101007 VDRAIN VBYPASS > Figure 10. Power-up With Optional External UV Resistor (4 M ) Connected to EN/UV Pin. Figure 11. Power-up Without Optional External UV Resistor Connected to EN/UV Pin. Figure 12. Normal Power-down Timing (Without UV Resistor). Figure 13. Slow Power-down Timing With Optional External (4 M VDC-INPUT > PI-2395-030801 VDRAIN > ) UV Resistor Connected to EN/UV Pin. >

Open the catalog to page 6

) connected to the EN/UV pin.During power-down, when an external resistor is used, the power MOSFET will switch for 32 ms after the output loses regulation. The power MOSFET will then remain off without any glitches since the undervoltage function prohibits restart when the line voltage is low. Figure 12 illustrates a typical power-down timing waveform. Figure 13 illustrates a very slow power-down timing waveform, as in standby applications. The external resistor (4 M ) is connected from the power supply positive DC input to the EN/UV pin, the power MOSFET switching will be delayed during power-up...

Open the catalog to page 7

F ceramic capacitor is placed directly between BP and SOURCE pins. F or 10 F to select the reduced or increased current limit mode, it is recommended that an additional 0.1 should be located as close as possible to the SOURCE and BYPASS pins of the device.For best performance of the OVP function, it is recommended that a relatively high bias winding voltage is used, in the range of 15 V-30 V. This minimizes the error voltage on the bias winding due to leakage inductance and also ensures adequate voltage during no-load operation from which to supply the IC device consumption. Selecting the Zener...

Open the catalog to page 10

Copper area for heat sinkingReturn bias windingdirectly to input capacitorMaximize hatched copper areas ( ) for optimum heatsinking Safety Spacing > Y1- Capacitor + - > HV Input Filter Capacitor Output Rectifier PRI T r a n s f o r m e r BIAS BIAS R SEC D PRI C > TinySwitch-PK S S S S BP EN/UV > BP Opto- coupler > UV DC OUT + - Bypass capacitor connection to device should be shortRoute connections to EN/UV pin(including undervoltage resistor)away from drain connected traces > PI-4675-051507 Figure 16. Layout Considerations for TinySwitch-PK Using P Package. Y-Capacitor > DS does not exceed 650...

Open the catalog to page 11

Control Functions (cont.)BP/M Pin Charge Current V > BP/M = 0 V,T I > CH1 J = 25 аCSee Note D, ETNY375-378-8.3-5.4-2.5 V = 4 V,T ATNY379-380-9.7-7.1-3.9I > BP/M CH2 J = 25 CSee Note D, ETNY375-378-5-3.5-1.5TNY379-380-6.6-4.8-2.1 BP/M Pin Voltage V > BP/M See Note D5.65.856.15V BP/M Pin Voltage Hysteresis V > BP/MH 0.800.951.20V BP/M Pin Shunt Voltage V > SHUNT I > BP = 2 mA6.06.46.7V EN/UV Pin Line Under-voltage Threshold I > LUV T > J = 25 аC22.52527.5 A Circuit Protection Peak Current Limit (BP/M Capacitor = 0.1 di/dt = 72 mA/ sT > J = 25 CSee Note FTNY375PN330355380 mATNY375GN330355387di/dt...

Open the catalog to page 13

Circuit Protection (cont.) Peak Current Limit (BP/M Capacitor = 10 di/dt = 72 mA/ sT > J = 25 аCSee Note FTNY375PN349375413 mATNY375GN349375424di/dt = 91 mA/ sT > J = 25 CSee Note FTNY376PN465500550TNY376GN465500565di/dt = 117 mA/ sT > J = 25 аCSee Note FTNY377PN665715787TNY377GN665715808di/dt = 143 mA/ I > LIMITPEAKinc F) See Note E sT > J = 25 CSee Note FTNY378PN786845930TNY378GN786845955di/dt = 169 mA/ sT > J = 25 аCSee Note FTNY379PN9079751073TNY379GN9079751102di/dt = 195 mA/ sT > J = 25 CSee Note FTNY380PN102811051216TNY380GN102811051249 > 2 f = I > LIMITPEAK(TYP)2 Зf > 2 OSC(TYP) 2 f I...

Open the catalog to page 14

TinySwitch-PK

TinySwitch-PK

Catalog excerpts

All Power Integrations catalogs and technical brochures

Archived catalogs