JHW050FG Datasheet, PDF (9/17 Pages) Lineage Power Corporation – JHW050 Dual Positive Output-Series Power Modules dc-dc Converter: 36 Vdc to 75 Vdc Input, Dual Positive Outputs 50W

Data Sheet
April 2008
JHW050 Dual Positive Output-Series Power Modules: dc-dc
Converter: 36 Vdc to 75 Vdc Input, Dual Positive Outputs; 50W
Feature Descriptions
Flexible Power Trading
The full rated output current can be drawn from either
output within the limits shown in Figure 15.
If not using the remote on/off feature:
For negative logic, short the ON/OFF pin to VI(-).
For positive logic, leave the ON/OFF pin open.
Output Overvoltage Protection
16
14
AF
FG, FY, GY
12
10
8
6
4
2
0 _{0 2 4 6 8 10 12 14 16}
IO2 (A)
Figure 15.Current Sharing Between Outputs
Overcurrent Protection
1-0864
To provide protection in a fault (output overload) condi-
tion, the unit is equipped with internal current-limiting
circuitry and can endure current limiting continuously.
At the point of current-limit inception, the unit enters
hiccup mode. The unit operates normally once the out-
put current is brought back into its specified range. The
average output current during hiccup is 15% IO,max.
Remote On/Off
Two remote on/off options are available. Positive logic
turns the module on during a logic high voltage on the
ON/OFF pin, and off during a logic low. Negative logic
turns the module off during a logic high and on during a
logic low. Negative logic, device code suffix “1”, is the
factory-preferred configuration.
VI(+)
Ion/off
Von/off
ON/OFF
VO1(+)
VO1(-)
VO2(+)
VO2(-)
VI(-)
The main output voltage is limited by an internal clamp.
This provides protection from excessive overvoltage. If
an accurate overvoltage limit is required this should be
implemented externally via the remote On/Off function.
Figure 17 shows a basic circuit for a 5V output unit with
positive remote On/Off logic. In an overvoltage condi-
tion the unit will shut down and then restart.
VI(+)
VO(+)
15k
100R
ON/OFF
VI(-)
VO(-)
TL431
10k
Figure 17.Overvoltage Circuit
Overtemperature Protection
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. the unit will
shutdown if the overtemperature threshold is
exceeded, it will then wait for the unit to cool before
attempting to restart.
The unit will typically enter thermal shutdown when the
temperatures measured at the thermal reference points
(see Figures 20 and 21) reach 120 °C.
SeqFET Drive Supply – Optional (–F)
The SeqFET function provides a DC voltage above the
main output suitable for driving an external FET in
series with VO1 and/or VO2. This allows for flexibility in
sequencing turn-on and turn-off of the module outputs.
Figure 16.Remote On/Off Implementation
To turn the power module on and off, the user must
supply a switch (open collector or equivalent) to control
the voltage (Von/off) between the ON/OFF terminal and
the VI(-) terminal (see Figure 16). Logic low is 0V ≤
Von/off ≤ 0.8V. The maximum Ion/off during a logic low is
1mA, the switch should be maintain a logic low level
whilst sinking this current.
During a logic high, the maximum Von/off generated by
the module is 15V, and the maximum allowable leak-
age current at Von/off = 15V is 50µA.
Lineage Power
VO1(+)
FET
SeqFET
ON/OFF
VO1(-)
Figure 18.SeqFET Application
Note: SeqFET pin 8 is an optional pin. Standard modules will not have this pin fitted.
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