12

TET2000 Series

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PARAMETER

DESCRIPTION

MIN

NOM

MAX

UNIT

PWOK output

Output low level voltage

V1 or VSB out of regulation Isink=400

A

0

0.4

V

Output high level voltage

V1 and VSB in regulation Isource=200

A

2.4

3.46

V

Maximum Sink Current

PWOK = low

400

A

Maximum Source Current

PWOK = high

2

mA

Recommended external pull up

resistor on PWOK at

VpuPWOK = 3.3 V

VpuPWOK = 5 V

6.8

10

10

15

k

Ω

ACOK output

Output low level voltage

Isink < 4mA

0

0.4

V

Output open collector

External pull up VDD

V

Recommended external pull up

resistor on ACOK at VpuACOK=

3.3V

10

k

Ω

Low level output

Input voltage is not within range

for PSU to operate

High level output

Input voltage is within range for

PSU to operate

8.1.2 PSON_L INPUT

The PSON_L is an internally pulled- up (3.3 V) input signal to enable / disable the main output V1 of the front-end. This active-

low pin is also used to clear any latched fault condition. Figure 26 shows PSON_L circuit used in PSU and proposed

connections.

PSU 1 PDU

PSU 2

3.3V

3.3V

PSU 1 PDU

PSU 2

3.3V

3.3V

PSON_L

PSON_L

PSON_L

PSON_L

10K

10K

10K

10K

Figure 26. PSON_L Connection

8.1.3 SENSE INPUTS

The main output has sense lines implemented to compensate for voltage drop on load wires in both positive and negative

path. The maximum allowed voltage drop is 200 mV on the positive rail and 50 mV on the GND rail.

With open sense inputs the main output voltage will rise by 250 mV. Therefore, if not used, these inputs should be connected

to the power output and GND at the power supply connector. The sense inputs are protected against short circuit. In this

case the power supply will shut down.

8.2 ELECTRICAL CHARACTERISTICS (OUTPUT SIGNALS)

All Output signals versus signal ground SGND in PSU.