PS10/PS11

10

A051204

RTB

9.76K

6.81K

487K

RTD

RTC

TB

OV

UV

V

TC

PWRGD-C

PWRGD-D

TD

PWRGD-A

PWRGD-B

PS11

-48V

GND

Notes:

1. Under Voltage Shutdown (UV) set to 37V.

2. Over Voltage Shutdown (OV) to 57.8V.

3. Other power good outputs will have the same

configuration as PWGRGD-A for Active Low Enabled

Converters.

10nF

Ramp

COM

+3.3V

V-

V+

DC/DC

Converter

/EN

Opto-coupler

49.9k

IN

Increasing the Under and Over Voltage Hysteresis

If the internal UV hysteresis is insufficient for a particular system application, then it may be increased by using separate resis-

tor dividers for UV and OV and providing a resistor feedback from UV pin to the PWRGD pin.

RTB

16.5k

9.76k

487k

RTD

RTC

TB

OV

UV

V

TC

PWRGD-C

PWRGD-D

TD

PWRGD-A

PWRGD-B

PS10

-48V

GND

Note:

1. Other power good outputs will have the same configuration as

PWGRGD-A for Active High Enabled Converters.

2. Over voltage shut down set to 63.6V

10nF

Ramp

COM

+3.3V

V-

V+

DC/DC

Converter

EN

Ruvhys

499k

V

IN

EE

Ruvhys can be calculated based on higher UV On voltage (say

42V):

Ruvhys = (Vuvon - Vdiode - Vpwrgdlow)/((Vin-Vuvon)/487k -

Vuvon/16.5k)

= (1.22-0.65-0.4)/((42-1.22)/487k - 1.22/16.5k)

= 17.35k