Datasheet > EPR-91

EPR-91

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
页数	文件大小	规格书
36页	713K
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Engineering Prototype Report for EP-91 - 12 W Power Supply using

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EPR-91 数据手册

EP-91 12 V, 1 A, Universal Input Supply

7-Feb-2006

4.7 Peak Primary Current Limit Selection

The value of the capacitor installed on the BP/M pin allows the current limit of U1 to be

selected. The power supply designer can change the current limit of the MOSFET by

simply changing the capacitance value connected to the BP/M pin (see the TinySwitch-III

data sheet for more details).

ꢀ Installing a 0.1 µF capacitor on the BP/M pin selects the standard current

limit of the IC, and is the normal choice for enclosed adapter applications.

ꢀ Installing a 1 µF capacitor on the BP/M pin reduces the MOSFET current

limit, which lowers conduction losses and improves efficiency (at the

expense of reducing the maximum power capability of the IC).

ꢀ A 10 µF capacitor on the BP/M pin will raise the MOSFET current limit and

extend the power capability of the IC (for higher power applications that do

not have the thermal constraints of an enclosed adapter, or to supply

short-duration, peak load demands).

The EP91 demonstration board comes with a 0.1 µF capacitor installed as C7, which

causes U1 to select the standard current limit specified in the TinySwitch-III data sheet. If

C7 were replaced by a 1 µF capacitor (C8 in the BOM, section 6), the current limit of U1

will be the same as the standard current limit for a TNY277 device. If a 10 µF capacitor is

installed, the current limit of U1 will be the same as the standard current limit for a

TNY279 device. The flexibility of this option enables the designer to do three things.

First, it allows the designer to measure the effect of switching to an adjacent device

without actually removing and replacing the IC. Second, it allows a larger device to be

used with a lower current limit, for higher efficiency. Third, it allows a smaller device to

be used with a higher current limit in a design when higher power is not required on a

continual basis, which effectively lowers the cost of the supply.

4.8 UV Lockout

The EP91 circuit board has a location where an optional under-voltage (UV) lockout

detection resistor (R5) can be installed. When installed, MOSFET switching is disabled

at startup until current into the EN/UV pin exceeds 25 µA. This allows the designer to set

the input voltage at which MOSFET switching will be enabled by choosing the value of

R5. For example, a value of 3.6 MΩ requires an input voltage of 65 VAC (92 VDC across

C2) before the current into the EN/UV pin exceeds 25 µA. The UV detect function also

prevents the output of the power supply from glitching (trying to restart) after output

regulation is lost (during shutdown), by disabling MOSFET switching until the input

voltage rises above the under-voltage lockout threshold.

Power Integrations

Tel: +1 408 414 9200 Fax: +1 408 414 9201

www.powerint.com

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