Specifications

12
1-800-927-9474
20-18
ConverterPAC Functional Descriptions (cont)
Power Good (J3-3)
The optional Power Good signal on J3-3 is referenced to Signal Ground on J3-1, and indicates
the status of the output voltage. It is capable of sinking 20 mA maximum when 5V is used as
Vcc. This signal is asserted a TTL “1” when the output voltage is above 95% of nominal. It is a
TTL “0” when the output voltage is below 85% of nominal.
Power Good Inverted (J3-2)
This is the inverse of the Power Good signal on J3-3, referenced to Signal Ground on J3-1.
Signal Ground (J3-1)
Signal Ground on J3-1 is an isolated secondary ground reference for all J3 status signals. It is
used to provide a reference point for the Power Good circuitry, and is not the same as Earth
Ground on input power connector J9.
Vcc (J3-4)
The Vcc on J3-1 is an input that requires +5V either from the Auxiliary Vcc on J10-9, or from
another source. Input current to this pin is limited by an internal resistor to 3 mA. If the
Auxiliary Vcc on J10-9 is connected to Vcc on J3-4, then Signal Ground J10-10 must also be
connected to Signal Ground on J3-1.
ConverterPAC Remote Sense and Trim Interface
(J2 for Single Outputs or J2A and J2B for Dual Outputs)
+Sense/–Sense (J2)
The +Sense on J2-2 should be connected to the +Power Out, and the –Sense on J2-3 to the
–Power Out terminal. Do not leave the Sense pins open.
These pins may be terminated locally at the output of the power supply, in which case the power
supply will provide regulation at the output terminals. The voltage appearing at the load may
drop slightly due to voltage drop in the power cables. If it is necessary to compensate for voltage
drop along the output power cables, this termination should be made close to the output load.
Compensation of up to 0.5V can be obtained. Use twisted pair 20-22 AWG wire for this purpose.
For DualPACs, the +Sense pins are available on connectors designated as J2A-2 and J2B-2 for
outputs A and B, respectively. –Sense pins are on J2A-3 and J2B-3, respectively. These pins are
also duplicated on power connectors J1A and J1B.
Applications Manual
Autoranging/Mini/PFC MegaPAC
Signal Ground
10
12
9
11
J10 Interface Connector
Signal Ground
Vcc
Vcc (+5 V/0.3 A)
Power Good
2
Vcc
4
J3
10K
2.49K
2N2222
2.49K
1
Power Good
3
J3 "Power good" connector (optional).
Mating receptacle is Molex
#39-01-0043 housing using #39-00-0031
terminals and 22-28 AWG stranded wire.
Use Molex tool #57005-5000.
4
3
2
PIN
Vcc
Power good
Power good inv.
Signal ground
1
Figure 22.
Power Good and
Vcc