EP5358LUI datasheet(10/14 Pages) ENPIRION

10 / 14 page

03541

5/29/2009

Rev:A

EP5358LUI/EP5358HUI

www.enpirion.com

COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 200uF

EP5358HUI:

COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 100uF

The nominal value for COUT is 10uF. See the

applications section for more details.

Over Current/Short Circuit Protection

The current limit function is achieved by

sensing the current flowing through a sense P-

MOSFET which is compared to a reference

current. When this level is exceeded the P-

FET is turned off and the N-FET is turned on,

pulling VOUT low. This condition is maintained

for approximately 0.5mS and then a normal

soft start is initiated.

If the over current

condition still persists, this cycle will repeat.

Under Voltage Lockout

During initial power up an under voltage

lockout circuit will hold-off the switching

circuitry until the input voltage reaches a

sufficient level to insure proper operation. If

the voltage drops below the UVLO threshold

the lockout circuitry will again disable the

switching. Hysteresis is included to prevent

chattering between states.

Enable

The ENABLE pin provides a means to shut

down

the

converter

enable

normal

operation.

A logic low will disable the

converter and cause it to shut down. A logic

high will enable the converter into normal

operation.

NOTE:

The ENABLE pin must not be left

floating.

Thermal Shutdown

When excessive power is dissipated in the

chip, the junction temperature rises. Once the

junction temperature exceeds the thermal

shutdown temperature the thermal shutdown

circuit turns off the converter output voltage

thus allowing the device to cool. When the

junction temperature decreases by 15C°, the

device will go through the normal startup

process.

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