TNY287datasheet规格书PDF资源-CSDN文库

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TNY287是Power Integrations公司生产的一个系列产品TinySwitch-4家族中的成员。TinySwitch-4是一系列高效能、离线式开关器，它们集成了多个电源转换功能，具备线性补偿的过载功率™，适合多种电源应用，包括电源适配器、峰值或开架式设计。TNY287芯片具有可配置的电流限制、可调整的输入欠压锁定阈值，并支持在不同应用场景中轻松更换芯片，无需进行其他电路设计修改。产品特性包括： 1. 低系统成本与增强灵活性：TNY287系列产品配置了725V额定MOSFET，提高了BV降额余量。它具有线性补偿的过载功率特性，无需额外组件，显著降低了在通用输入电压范围内的最大过载波动。±5%的开启UV阈值允许通过单个外部电阻实现线路电压感应。此外，它还提供了简单的开启/关闭控制，无需环路补偿，通过BP/M电容值的可选电流限制，可以优化TinySwitch-4的选择，同时简化了PCB的散热设计。 2. 先进的安全性和可靠性：TNY287系列具备精确的热滞式热关断保护，具有自动恢复功能，免除了手动复位的需求。自动重启功能能够在短路情况下提供<3%的最大功率输出，保护系统安全。此外，芯片还具有自我偏置功能，无需偏置绕组或偏置组件，频率抖动功能有助于降低EMI滤波成本。 3. 输出功率表：TNY287系列芯片的输出功率能力在不同的封装形式中有所不同，包括SO-8C、DIP-8C和eSOP-12B。不同的字母后缀代表了不同封装的芯片类型。例如，D代表SO-8C封装，P代表DIP-8C封装，而K代表eSOP-12B封装。输出功率表显示了在AC 85-265V或AC 90-265V宽电压输入范围内，各种芯片可以提供的最小连续功率和峰值功率。在典型的非通风封装适配器中，最小连续功率在+50°C环境温度下测量得出，使用外部散热器可以增加功率能力。而在任何设计中，它都具有最小的峰值功率能力，在开架式设计中则为最小连续功率。 TNY287系列芯片的典型应用场景包括电源适配器和充电器。这些芯片能够支持封装式适配器中提高效率，或者在开架式应用场景中扩展峰值功率或最大连续功率。在封装式适配器/充电器中，较低的电流限制能够提升效率。而在开架式应用场景中，较高的电流限制能够扩展峰值功率或最大连续功率。 TNY287系列芯片的高压MOSFET设计对于系统成本和系统整体性能的优化具有重要意义。芯片的频率抖动和自我偏置特性降低了EMI滤波成本，同时简化了散热器设计。此外，芯片的SOURCE引脚是电磁兼容性（EMC）设计的关键，它保持了电气上的静默，减少了EMI。在进行TNY287芯片的电路设计时，用户需要注意选择合适的外围元件，包括反馈电阻、滤波电容、限流电阻等，以满足特定的电源设计需求。TNY287系列芯片的高集成度和易用性，使其成为电源设计工程师的理想选择，尤其是在需要满足严格效率、尺寸和成本要求的应用中。

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TNY284-290

TinySwitch-4 Family

www.powerint.com September 2012

Energy-Efcient, Off-Line Switcher With

Line Compensated Overload Power

™

Output Power Table

Product

230 VAC ± 15% 85-265 VAC

Adapter

Peak or

Open

Frame

Adapter

Peak or

Open

Frame

TNY284P/D/K 6 W 11 W 5 W 8.5 W

TNY285P/D 8.5 W 15 W 6 W 11.5 W

TNY285K 11 W 15 W 7.5 W 11.5 W

TNY286P/D 10 W 19 W 7 W 15 W

TNY286K 13.5 W 19 W 9.5 W 15 W

TNY287D 11.5 W 23.5 W 7 W 18 W

TNY287P 13 W 23.5 W 8 W 18 W

TNY287K 18 W 23.5 W 11 W 16 W

TNY288P 16 W 28 W 10 W 21.5 W

TNY288K 23 W 28 W 14.5 W 21.5 W

TNY289P 18 W 32 W 12 W 25 W

TNY289K 25 W 32 W 17 W 25 W

TNY290P 20 W 36.5 W 14 W 28.5 W

TNY290K 28 W 36.5 W 20 W 28.5 W

Table 1. Output Power Table.

Notes:

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

capability.

2. Minimum peak power capability in any design or minimum continuous power in

an open frame design (see Key Applications Considerations).

3. Packages: D: SO-8C, P: DIP-8C, K: eSOP-12B. See Part Ordering Information.

Product Highlights

Lowest System Cost with Enhanced Flexibility

• 725 V rated MOSFET

• Increases BV de-rating margin

• Line compensated overload power – no additional components

• Dramatically reduces max overload variation over universal

input voltage range

• ±5% turn on UV threshold: line voltage sense with single

external resistor

• Simple ON/OFF control, no loop compensation needed

• Selectable current limit through BP/M capacitor value

• Higher current limit extends peak power or, in open frame

applications, maximum continuous power

• Lower current limit improves efﬁciency in enclosed

adapters/chargers

• Allows optimum TinySwitch-4 choice by swapping devices

with no other circuit redesign

• Tight I

f parameter tolerance reduces system cost

• Maximizes MOSFET and magnetics utilization

• ON-time extension – extends low-line regulation range/hold-up

time to reduce input bulk capacitance

• Self-biased: no bias winding or bias components

• Frequency jittering reduces EMI ﬁlter costs

• Pin-out simpliﬁes heat sinking to the PCB

• SOURCE pins are electrically quiet for low EMII

Enhanced Safety and Reliability Features

• Accurate hysteretic thermal shutdown protection with auto-

matic recovery eliminates need for manual reset

• Auto-restart delivers <3% of maximum power in short-circuit

and open loop fault conditions

• Output overvoltage shutdown with optional Zener

• Fast AC reset with optional UV external resistor

• Very low component count enhances reliability and enables

single-sided printed circuit board layout

• High bandwidth provides fast turn-on with no overshoot and

excellent transient load response

• Extended creepage between DRAIN and all other pins improves

ﬁeld reliability

EcoSmart

™

– Extremely Energy Efﬁcient

• Easily meets 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 down to very light

loads – ideal for mandatory CEC regulations and EuP standby

requirements

Applications

• PC Standby and other auxiliary supplies

• DVD/PVR and other low power set top decoders

• Supplies for appliances, industrial systems, metering, etc

• Chargers/adapters for cell/cordless phones, PDAs, digital

cameras, MP3/portable audio, shavers, etc.

Figure 1. Typical Standby Application.

PI-6578-101411

Wide-Range

High-Voltage

DC Input

EN/UV

BP/M

Output

TinySwitch-4

Figure 2. Package Options.

eSOP-12B (K Package) DIP-8C (P Package) SO-8C (D Package)

捷多邦，您值得信赖的PCB打样专家！

Rev. A 09/12

TNY284-290

www.powerint.com

to provide an output overvoltage function with a Zener

connected from the BYPASS/MULTI-FUNCTIONAL pin to a

bias winding supply.

ENABLE/UNDERVOLTAGE (EN/UV) Pin:

This pin has dual functions: enable input and line undervoltage

sense. During normal operation, switching of the power

MOSFET is controlled by this pin. MOSFET switching is

terminated when a current greater than a threshold current is

drawn from this pin. Switching resumes when the current being

pulled from the pin drops to less than a threshold current. A

modulation of the threshold current reduces group pulsing. The

threshold current is between 75 μA and 115 μA.

The ENABLE/UNDERVOLTAGE pin also senses line

undervoltage conditions through an 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 the

line undervoltage function.

SOURCE (S) Pin:

This pin is internally connected to the output MOSFET source

for high-voltage power return and control circuit common.

TinySwitch-4 Functional Description

TinySwitch-4 combines a high-voltage power MOSFET switch

with a power supply controller in one device. Unlike conventional

PWM (pulse width modulator) controllers, it uses a simple

ON/OFF control to regulate the output voltage.

The controller consists of an oscillator, enable circuit (sense and

logic), current limit state machine, 5.85 V regulator, BYPASS/

MULTI-FUNCTION pin undervoltage, overvoltage circuit, and

current limit selection circuitry, over-temperature protection,

current limit circuit, leading edge blanking, and a 725 V power

MOSFET. TinySwitch-4 incorporates additional circuitry for line

undervoltage sense, auto-restart, adaptive switching cycle

on-time extension, and frequency jitter. Figure 3 shows the

functional block diagram with the most important features.

Figure 5. Frequency Jitter.

600

0510

136 kHz

128 kHz

DRAIN

Time (µs)

PI-2741-041901

500

400

300

200

100

Oscillator

The typical oscillator frequency is internally set to an average of

132 kHz. Two signals are generated from the oscillator: the

maximum duty cycle signal (DC

MAX

) and the clock signal that

indicates the beginning of each cycle.

The oscillator incorporates circuitry that introduces a small

amount of frequency jitter, typically 8 kHz peak-to-peak, to

minimize EMI emission. The modulation rate of the frequency

jitter is set to 1 kHz to optimize EMI reduction for both average

and quasi-peak emissions. The frequency jitter should be

measured with the oscilloscope triggered at the falling edge of

the DRAIN waveform. The waveform in Figure 5 illustrates the

frequency jitter.

Enable Input and Current Limit State Machine

The enable input circuit at the ENABLE/UNDERVOLTAGE pin

consists of a low impedance source follower output set at 1.2 V.

The current through the source follower is limited to 115 μA.

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 ENABLE/UNDER-

VOLTAGE pin voltage or current during the remainder of the

cycle are ignored.

The current limit state machine reduces the current limit by

discrete amounts at light loads when TinySwitch-4 is likely to

switch in the audible frequency range. The lower current limit

raises the effective switching frequency above the audio range

and reduces the transformer ﬂux density, including the

associated audible noise. The state machine monitors the

sequence of enable events to determine the load condition and

adjusts the current limit level accordingly in discrete amounts.

Under most operating conditions (except when close to

no-load), the low impedance of the source follower keeps the

voltage on the ENABLE/UNDERVOLTAGE pin from going much

below 1.2 V in the disabled state. This improves the response

time of the optocoupler that is usually connected to this pin.

5.85 V Regulator and 6.4 V Shunt Voltage Clamp

The 5.85 V regulator charges the bypass capacitor connected

to the BYPASS pin to 5.85 V by drawing a current from the

voltage on the DRAIN pin whenever the MOSFET is off. The

BYPASS/MULTI-FUNCTION pin is the internal supply voltage

node. When the MOSFET is on, the device operates from the

energy stored in the bypass capacitor. Extremely low power

consumption of the internal circuitry allows TinySwitch-4 to

operate continuously from current it takes from the DRAIN pin.

A bypass capacitor value of 0.1 μF is sufﬁcient for both high

frequency decoupling and energy storage.

In addition, there is a 6.4 V shunt regulator clamping the

BYPASS/MULTI-FUNCTION pin at 6.4 V when current is

provided to the BYPASS/MULTI-FUNCTION pin through an

Rev. A 09/12

TNY284-290

www.powerint.com

Figure 6. Auto-Restart Operation.

PI-4098-082305

2500 5000

Time (ms)

100

200

300

DRAIN

DC-OUTPUT

external resistor. This facilitates powering of TinySwitch-4

externally through a bias winding to decrease the no-load

consumption to well below 50 mW.

BYPASS/MULTI-FUNCTION Pin Undervoltage

The BYPASS/MULTI-FUNCTION pin undervoltage circuitry

disables the power MOSFET when the BYPASS/MULTI-

FUNCTION pin voltage drops below 4.9 V in steady state

operation. Once the BYPASS/MULTI-FUNCTION pin voltage

drops below 4.9 V in steady state operation, it must rise back to

5.85 V to enable (turn-on) the power MOSFET.

Over Temperature Protection

The thermal shutdown circuitry senses the die temperature.

The threshold is typically set at 142 °C with 75 °C 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 °C (typical) is provided to prevent over-

heating of the PC board due to a continuous fault condition.

Current Limit

The current limit circuit senses the current in the power

MOSFET. When this current exceeds the internal threshold

LIMIT

), the power MOSFET is turned off for the remainder of that

cycle. The current limit state machine reduces the current limit

threshold by discrete amounts under medium and light loads.

The leading edge blanking circuit inhibits the current limit

comparator for a short time (t

LEB

) after the power MOSFET is

turned on. This leading edge blanking time has been set so

that current spikes caused by capacitance and secondary-side

rectiﬁer reverse recovery time will not cause premature

termination of the switching pulse.

Auto-Restart

In the event of a fault condition such as output overload, output

short-circuit, or an open loop condition, TinySwitch-4 enters

into auto-restart operation. An internal counter clocked by the

oscillator is reset every time the ENABLE/UNDERVOLTAGE pin

is pulled low. If the ENABLE/UNDERVOLTAGE pin is not pulled

low for 64 ms, the power MOSFET switching is normally

disabled for 2.5 seconds (except in the case of line undervoltage

condition, in which case it is disabled until the condition is

removed). The auto-restart alternately enables and disables the

switching of the power MOSFET until the fault condition is

removed. Figure 6 illustrates auto-restart circuit operation in the

presence of an output short-circuit.

In the event of a line undervoltage condition, the switching of

the power MOSFET is disabled beyond its normal 2.5 seconds

until the line undervoltage condition ends.

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

MAX

signal goes low. This feature reduces the

minimum input voltage required to maintain regulation, extending

hold-up time and minimizing the size of bulk capacitor required.

The on-time extension is disabled during the start-up of the

power supply, until the power supply output reaches regulation.

Line Undervoltage Sense Circuit

The DC line voltage can be monitored by connecting an

external resistor from the DC line to the ENABLE/

UNDERVOLTAGE pin. During power-up or when the switching

of the power MOSFET is disabled in auto-restart, the current

into the ENABLE/UNDERVOLTAGE pin must exceed 25 μA to

initiate switching of the power MOSFET. During power-up, this

is accomplished by holding the BYPASS/MULTI-FUNCTION pin

to 4.9 V while the line undervoltage condition exists. The

BYPASS/MULTI-FUNCTION pin then rises from 4.9 V to 5.85 V

when the line undervoltage condition goes away. When the

switching of the power MOSFET is disabled in auto-restart

mode and a line undervoltage condition exists, the auto-restart

counter is stopped. This stretches the disable time beyond its

normal 2.5 seconds until the line undervoltage condition ends.

The line undervoltage circuit also detects when there is no

external resistor connected to the ENABLE/UNDERVOLTAGE

pin (less than ~2 μA into the pin). In this case the line

undervoltage function is disabled.

TinySwitch-4 Operation

TinySwitch-4 devices operate in the current limit mode. When

enabled, the oscillator turns the power MOSFET on at the

beginning of each cycle. The MOSFET is turned off when the

current ramps up to the current limit or when the DC

MAX

limit is

reached. Since the highest current limit level and frequency of

a TinySwitch-4 design are constant, the power delivered to the

load is proportional to the primary inductance of the transformer

and peak primary current squared. Hence, designing the

supply involves calculating the primary inductance of the

transformer for the maximum output power required. If the

TinySwitch-4 is appropriately chosen for the power level, the

current in the calculated inductance will ramp up to current limit

before the DC

MAX

limit is reached.

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