EP5358LUI datasheet(10/16 Pages) ALTERA

10 / 16 page

EP5358LUI/EP5358HUI

Excess bulk capacitance on the output of the

device can cause an over-current condition at

startup.

The maximum total capacitance on

the output, including the output filter capacitor

and bulk and decoupling capacitance, at the

load, is given as:

EP5358LUI:

COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 230uF

EP5358HUI:

COUT_TOTAL_MAX = COUT_Filter + COUT_BULK = 115uF

EP5358LUI in external divider mode:

COUT_TOTAL_MAX = 2.086x10

-4/V

OUT Farads

The above numbers and formula assume a no

load condition.

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.

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.

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.

www.altera.com/enpirion Page 10

03541

October 11, 2013

Rev F

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