Datasheet > TNY256G-TL

TNY256G-TL

更新时间： 2022-09-29 19:20:12

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
20页	511K
描述
IC OFFLINE SWIT OTP UVLO HV 8SMD

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TNY256G-TL 数据手册

TNY256

200

100

200

100

DC-BUS

BYPASS

DRAIN

BYPASS

DRAIN

400

200

400

200

Time (ms)

Figure 8. TNY256 Power-up With External Resistor (2 MΩ)

Figure 9. TNY256 Power-up Without External Resistor Connected

to EN/UV Pin.

Connected to EN/UV Pin.

powerlevelatthelowestinputvoltage,thecalculatedinductance

will ramp up the current to the current limit before the DC_MAX

limit is reached.

ON/OFF Control

The internal clock of the TNY256 runs all the time. At the

beginning of each clock cycle, it samples the EN/UV pin to

decide whether or not to implement a switch cycle. If the

EN/UV pin is high (< 40 µA), then a switching cycle takes

place. If the EN/UV pin is low (greater than 50 µA) then no

switching cycle occurs, and the EN/UV pin status is sampled

again at the start of the subsequent clock cycle.

Enable Function

TNY256 senses the EN/UV pin to determine whether or not to

proceed with the next switch cycle as described earlier. Once

a cycle is started, it always completes the cycle (even when the

EN/UV pin changes state half way through the cycle). This

operation results in a power supply whose output voltage ripple

is determined by the output capacitor, amount of energy per

switch cycle and the delay of the feedback.

At full load, TNY256 will conduct during the majority of its

clock cycles (Figure6). At loads less than full load, it will

“skip”morecyclesinordertomaintainvoltageregulationatthe

secondaryoutput. Atlightloadornoload, almostallcycleswill

be skipped (Figure7). A small percentage of cycles will

conducttosupportthepowerconsumptionofthepowersupply.

The EN/UV pin signal is generated on the secondary by

comparing the power supply output voltage with a reference

voltage. The EN/UV pin signal is high when the power supply

output voltage is less than the reference voltage.

The response time of the TNY256 ON/OFF control scheme is

veryfastcomparedtonormalPWMcontrol. Thisprovidestight

regulation and excellent transient response.

In a typical implementation, the EN/UV pin is driven by an

optocoupler. The collector of the optocoupler transistor is

connected to the EN/UV pin and the emitter is connected to the

SOURCEpin. TheoptocouplerLEDisconnectedinserieswith

a Zener across the DC output voltage to be regulated. When the

output voltage exceeds the target regulation voltage level

(optocoupler diode voltage drop plus Zener voltage), the

optocoupler diode will start to conduct, pulling the EN/UV pin

low. The Zener can be replaced by a TL431 device for

improved accuracy.

Power Up/Down

The TNY256 requires only a 0.1 µF capacitor on the BYPASS

pin. Because of the small size of this capacitor, the power-up

delay is kept to an absolute minimum, typically 0.3 ms. Due to

the fast nature of the ON/OFF feedback, there is no overshoot

at the power supply output. When an external resistor (2 MΩ)

is connected to the EN/UV pin, the power MOSFET switching

will be delayed during power-up until the DC line voltage

exceeds the threshold (100 V). Figures 8 and 9 illustrate the

power-up timing waveform of TNY256 in applications with

and without an external resistor (2 MΩ) connected to the

EN/UV pin.

The EN/UV pin pull-down current threshold is nominally

50 µA, but is set to 40 µA the instant the threshold is exceeded.

This is reset back to 50 µA when the EN/UV pull-down current

drops below the current threshold of 40 µA.

7/01

1 2 3 456 7 8...20

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与TNY256G-TL相关器件

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TNY256P	POWERINT	获取价格	TinySwitch Plus Energy Efficient, Low Power Off-line Switcher
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TNY256Y	POWERINT	获取价格	TinySwitch Plus Energy Efficient, Low Power Off-line Switcher
TNY256YN	POWERINT	获取价格	IC OFFLINE SWIT UVLO HV TO220
TNY263	POWERINT	获取价格	Enhanced, Energy Efficient, Low Power Off-line Switcher
TNY263_04	POWERINT	获取价格	Enhanced, Energy Efficient, Low Power Off-line Switcher
TNY263G	POWERINT	获取价格	Enhanced, Energy Efficient, Low Power Off-line Switcher
TNY263GN	POWERINT	获取价格	Enhanced, Energy Efficient, Low Power Off-line Switcher
TNY263GN-TL	POWERINT	获取价格	Enhanced, Energy Efficient, Low Power Off-line Switcher
TNY263GTL	POWERINT	获取价格	Enhanced, Energy Efficient, Low Power Off-line Switcher

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