Datasheet > TNY266P

TNY266P

更新时间： 2024-01-09 06:30:32

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		开关
页数	文件大小	规格书
20页	516K
描述
Enhanced, Energy Efficient, Low Power Off-line Switcher

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技术参数
数据手册

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TNY266P 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Not Recommended	零件包装代码：	DIP
包装说明：	0.300 INCH, LEAD FREE, PLASTIC, MS-001-AB, DIP-8	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	Factory Lead Time：	14 weeks
风险等级：	7.07	其他特性：	REQUIRES AN AC SUPPLY OF 85 TO 265 V
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	CURRENT-MODE
控制技术：	PULSE WIDTH MODULATION	JESD-30 代码：	R-PDIP-T7
JESD-609代码：	e3	长度：	9.575 mm
功能数量：	1	端子数量：	7
最高工作温度：	125 °C	最低工作温度：	-40 °C
最大输出电流：	0.56 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	表面贴装：	NO
切换器配置：	SINGLE	最大切换频率：	140 kHz
温度等级：	AUTOMOTIVE	端子面层：	Matte Tin (Sn)
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.62 mm	Base Number Matches：	1

TNY266P 数据手册

TNY264/266-268

(disable) is generated at the output of the enable circuit. This

enable circuit output is sampled at the beginning of each cycle

on the rising edge of the clock signal. If high, the power

MOSFETisturnedonforthatcycle(enabled).Iflow,thepower

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

are ignored.

TinySwitch-IIFunctionalDescription

TinySwitch-II combines a high voltage power MOSFET switch

withapowersupplycontrollerinonedevice.Unlikeconventional

PWM (Pulse Width Modulator) controllers, TinySwitch-IIuses

a simple ON/OFF control to regulate the output voltage.

The TinySwitch-II controller consists of an Oscillator, Enable

Circuit (Sense and Logic), Current Limit State Machine, 5.8 V

Regulator, Bypass pin Under-Voltage Circuit, Over

Temperature Protection, Current Limit Circuit, Leading Edge

Blanking and a 700 V power MOSFET. TinySwitch-II

incorporatesadditionalcircuitryforLineUnder-VoltageSense,

Auto-RestartandFrequencyJitter. Figure2showsthefunctional

block diagram with the most important features.

The Current Limit State Machine reduces the current limit by

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

switch in the audible frequency range. The lower current limit

raises the effective switching frequency above the audio range

andreducesthetransformerfluxdensityincludingtheassociated

audible noise. The state machine monitors the sequence of

EN/UV pin voltage levels to determine the load condition and

adjusts the current limit level accordingly in discrete amounts.

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.

Under most operating conditions (except when close to no-

load), the low impedance of the source follower keeps the

voltage on the EN/UV pin from going much below 1.0 V in the

disabledstate.Thisimprovestheresponsetimeoftheoptocoupler

that is usually connected to this pin.

The TinySwitch-II 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

forbothaverageandquasi-peakemissions. Thefrequencyjitter

should be measured with the oscilloscope triggered at the

fallingedgeoftheDRAINwaveform.ThewaveforminFigure4

illustrates the frequency jitter of the TinySwitch-II.

5.8 V Regulator and 6.3 V Shunt Voltage Clamp

The 5.8 V regulator charges the bypass capacitor connected to

the BYPASS pin to 5.8 V by drawing a current from the voltage

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

BYPASS pin is the internal supply voltage node for the

TinySwitch-II. When the MOSFET is on, the TinySwitch-II

operates from the energy stored in the bypass capacitor.

Extremely low power consumption of the internal circuitry

allows TinySwitch-II 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.

Enable Input and Current Limit State Machine

The enable input circuit at the EN/UV pin consists of a low

impedance source follower output set at 1.0 V. The current

through the source follower is limited to 240 µA. When the

current out of this pin exceeds 240 µA, a low logic level

In addition, there is a 6.3 V shunt regulator clamping the

BYPASS pin at 6.3 V when current is provided to the BYPASS

pin through an external resistor. This facilitates powering of

TinySwitch-II externally through a bias winding to decrease the

no load consumption to about 50 mW.

600

500

DRAIN

400

300

200

BYPASS Pin Under-Voltage

The BYPASS pin under-voltage circuitry disables the power

MOSFET when the BYPASS pin voltage drops below 4.8 V.

Once the BYPASS pin voltage drops below 4.8 V, it must rise

back to 5.8 V to enable (turn-on) the power MOSFET.

100

136 kHz

128 kHz

Time (µs)

Figure 4. Frequency Jitter.

7/01

1 234 5 6 7...20

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