TNY286PG

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1. Features

    1. Lowest system cost, enhanced flexibility

        - MOSFET with a rated voltage of 725 V

        - Increase the BV derating range

        - Line compensation for overload power-no additional components required

        - Significantly reduce the maximum overload change of the universal input voltage range

        - ±5% turn-on UV threshold: use a single external voltage to detect line voltage Resistor

        - Simple on/off control without loop compensation

        - Current limit selectable by BP/M capacitor value

        - Higher current limit can extend peak power, or in an open frame Application, maximum continuous power

        - Lower current limit improves the efficiency of the enclosed adapter/charger

        - By connecting the device with No other circuit redesign

        - Tight I2f parameter tolerance reduces system cost

        - Maximize the utilization of MOSFET and magnetic materials

        - Extend the conduction time-extend the low voltage adjustment range/hold time Reduce input bulk capacitance

        - Self-bias: no bias winding or bias components

        - Frequency jitter reduces the cost of EMI filters

        - Pin assignment simplifies PCB heat dissipation

        - SOURCE pin is electrically quiet for low EMI

    2. Enhanced security and reliability features

        - Accurate hysteresis thermal shutdown protection with automatic function Recovery eliminates the need for manual reset

        - Automatic restart provides <3% short circuit and maximum power Open loop fault conditions

        - Output overvoltage shutdown with optional Zener diode

        - Fast AC reset with optional UV external resistor

        - Very small number of components improves reliability and realizes Single-sided printed circuit board layout

        - High bandwidth provides fast turn-on and without overshoot Excellent transient load response

        - The extended creepage distance between DRAIN and all other pins improves the field reliability

    3. EcoSmart™-extremely energy-efficient

        - Easily meet all global energy efficiency regulations

        - No load <30 mW with bias winding, <150 mW at 265 VAC without Bias winding

        - On/off control provides constant efficiency under very light loads

        - Very suitable for mandatory CEC regulations and EuP standby requirements

2. Pin configuration

3. Applications

    1. PC Standby and other auxiliary supplies

    2. DVD/PVR and other low power set top decoders

    3. Supplies for appliances, industrial systems, metering, etc

    4. Chargers/adapters for cell/cordless phones, PDAs, digital cameras, MP3/portable audio, shavers, etc.

4. Pin Functional Description

    1. DRAIN (D) Pin:

        This pin is the power MOSFET drain connection. It provides internal operating current for both start-up and steady-state operation.

    2. BYPASS/MULTI-FUNCTION (BP/M) Pin:

        - It is the connection point for an external bypass capacitor for the internally generated 5.85 V supply.

        - It is a mode selector for the current limit value, depending on the value of the capacitance added. Use of a 0.1 μF capacitor results in the standard current limit value. Use of a 1 μF capacitor results in the current limit being reduced to that of the next smaller device size. Use of a 10 μF capacitor results in the current limit being increased to that of the next larger device size for TNY285-290.

        - It provides a shutdown function. When the current into the bypass pin exceeds ISD, the device latches off until the BP/M voltage drops below 4.9 V, during a power-down or, when the UV function is employed with external resistors connected to the BP/UV pin, by taking the UV/EN pin current below IUV minus the reset hysteresis (Typ. 18.75 μA). This can be used to provide an output overvoltage function with a Zener connected from the BYPASS/MULTIFUNCTIONAL pin to a bias winding supply. 

5. Enable/Undervoltage (EN/UV) pin

This pin has a dual function: enable input and line undervoltage detection. During normal operation, the switching of the power MOSFET is controlled Through this pin. Terminate MOSFET switching when the current is greater The threshold current is drawn from this pin. Switch resume When the current drawn from the pin drops to less than Threshold current. Threshold current modulation is reduced Group pulsation. The threshold current is between 75 μA and 115 μA. ENABLE/UNDERVOLTAGE pin can also detect line undervoltage Adjust by external resistor connected to the DC line Voltage. If there is no external resistor connected to this pin, TinySwitch-4 detects its absence and disables line undervoltage Function.

6. Source (S) pin

This pin is internally connected to the output MOSFET source The high-voltage power circuit is shared with the control circuit.

7. TinySwitch-4 function description

TinySwitch-4 switches the high-voltage power MOSFET with The power controller in a device. Different from traditional PWM (pulse Width modulator) controller, which uses a simple On/off control to adjust the output voltage. The controller consists of an oscillator, an enabling circuit (sensing and logic), Current limit state machine, 5.85 V regulator, BYPASS/MULTIFUNCTION pin undervoltage, overvoltage circuit and current limit Selection circuit, over temperature protection, current limiting circuit, Leading edge blanking and 725 V power MOSFET. TinySwitch-4 Contains additional circuits for line undervoltage detection, Automatic restart, extended on-time of adaptive switching cycle, and Frequency jitter.

8. BYPASS/MULTI-FUNCTION Pin Capacitor

The BYPASS/MULTI-FUNCTION pin can use a ceramic capacitor as small as 0.1 μF for decoupling the internal power supply of the device. A larger capacitor size can be used to adjust the current limit. For TNY285-290, a 1 μF BYPASS/MULTI-FUNCTIONAL pin capacitor will select a lower current limit equal to the standard current limit of the next smaller device and a 10 μF BYPASS/MULTI-FUNCTIONAL pin capacitor will select a higher current limit equal to the standard current limit of the next larger device. The higher current limit level of the TNY290 is set to 850 mA typical. The TNY284 MOSFET does not have the capability for increased current limit so this feature is not available in this device.

9. Package overview