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LPM409 AC-DC Modular Power Supply Data Sheet
5V, 10V, 12V, 20V, 24V, 36V & 48V Single-Output Modules
10V, 20V Dual-Output Modules
7.3 Input - Signals, Features and Indicators description
Signal Name
Auxiliary Output
- 5V -
Input AC Low
Indication
- PFAIL -
Fan Fail / OTP
Indication
- FAN_FAIL -
Pin
1,2 vs
3,4
(RTN_D)
5
6
Description
Output is available when the AC input is over 85VAC. The output nominal output voltage is
5.0V at maximum current rating of 1.0A. Over current protection occurs above 1.5A. The
output is referenced to logic return, RTN_D.
Open Collector output with 20mA pull-down capability referenced to logic return RTN_D.
PFAIL open or High state indicates the warning that the input is out of limits (the input
voltage falls below 85Vac or rises over 264Vac ) 5 ms before the output goes below the
lower  regulation  limit.  PFAIL  will  turn-off  the  green  Input  OK  LED.
PFAIL LOW state indicates that the input voltage is within the operating range.
Open Collector output pin with 20mA pull-down capability referenced to logic return
RTN_D.
FAN_FAIL OPEN OR HIGH state indicates a fan failure/over temperature protection (OTP)
condition min. 100 ms before the unit shuts-down. A fan failure/OTP condition will turn-off
the green FAN OK LED.
FAN_FAIL LOW state indicates normal fan operation and no OTP condition.
7.4 Output - Signals, Features and Indicators description
Modules E, F, G, H, J
Signal Name
Positive sense
wire
- VS+ -
Negative sense
wire
- VS- -
Current share
- CSH -
Common
N/C
N/C
Output Good
indication
- PG_HI -
- PG_LO -
Output Inhibit
function
- INH_HI -
Pin
1
2
3
4
5
6
7
8
9
Description
Output voltage sense wire. Internally connected to Vout+ via 51 Ω. It is recommended to
connect sense wire at positive load point.
Output voltage sense wire. Internally connected to Vout- via 51 Ω. It is recommended to connect
sense wire at negative load point.
Common wire for parallel connected modules to achieve proper current sharing between the
modules. Referenced to the Common pin. Interconnect CS pin on all parallel working modules.
Active current share pin enables control of output voltage. Pulling-up this pin to 5V is possible to
increase the output voltage. Pull-down of this pin has no effect. Voltage on this pin is 3.0V at
nominal module current.
Reference pin to CSH
Open collector output with 20mA pull-down capability, max. 15V (recommended Rpull-up=1k,
Vcc=5V). Referenced to PG_LO.
PG_HI OPEN OR HIGH state indicates that the module output voltage is below lower regulation
limit. A PG_HI fail state turns the GREEN DC OK LED to RED.
PG_HI LOW state indicates the module output voltage is within normal operation limits.
Reference pin to PG_HI
An opto-isolated input with 2-10mA current capability. Apply +(3-15)V on INH_HI and RTN on
INH_LO (e.g. from the Auxiliary Output 5V) to activate the inhibit function.
INH_HI OPEN OR LOW state ENABLES the module output.
INH_HI HIGH state INHIBITES the module output.
BCD.00054 Rev. AC, 19-Dec-13
Page 9 of 20
www.power-one.com
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