AS2333N Просмотр технического описания (PDF) - Astec Semiconductor => Silicon Link

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AS2333N

Secondary side housekeeping circuit

Astec Semiconductor => Silicon Link 

AS23xx

Secondary Side Housekeeping Circuit

Pin Function Description (For AS2316)

Pin Number Function

1

VCC

2

+12 V

3

+5 V

4

+3.3

5

–5 V

6

–12 V

7

GND

8

HYST

9

OFF

10

AC

11

PG CAP

12

POK

13

DELAY

14

UVB

15

VREF

16

FAULT

Description

Power input to the chip.

Input for overvoltage and undervoltage for the +12 V rail.

Input for overvoltage and undervoltage for the +5 V rail.

Input for overvoltage and undervoltage for the +3.3V rail.

Input for overvoltage and undervoltage for the –5 V rail.

Input for overvoltage and undervoltage for the –12 V rail. This function may

disabled by tying this pin to a positive voltage above 2.4 V.

Signal ground and silicon substrate.

Open collector output of the AC undervoltage comparator. A resistor between this pin

and AC will provide hysteresis to the AC undervoltage sensing.

Pulling this pin low will reset the FAULT latch and discharge the start-up timing

capacitors, UVB and PG CAP, allowing normal start-up for the system. Pulling this pin

high will send the FAULT signal high, prompting a system shutdown.

Non-inverting input to the AC undervoltage sensing comparator. If the AC pin is

less than 2.5 V, POK goes low and UVB cap discharges.

A cap to ground provides a delay between undervoltage sensing becoming good

and the POK output going high. Cap discharges whenever an output or AC

undervoltage is detected.

Open collector output of the undervoltage sensing comparators. This pin goes low

upon an undervoltage condition. Except for the delay set by the PG CAP, this pin

always reflects the actual state of the undervoltage sensing.

A cap to ground will delay the FAULT signal when the OFF pin is used to shut down

the system. The POK will signal a power fail warning immediately, but the FAULT

shutdown of the power supply will be delayed.

A cap to ground provides start-up blanking of the undervoltage sensing portion of the

FAULT signal. This pin may also be grounded to prevent undervoltage conditions from

triggering the FAULT signal. This pin discharges the cap whenever AC goes low or

FAULT pin goes high.

2.5 V Voltage reference. This is a series regulator type reference.

Open collector output of the overvoltage and undervoltage comparators.

ASTEC Semiconductor

94

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