JHW250S30R2 Power Module; dc-dc Converter
36 – 75 Vdc Input; 30.2Vdc Output; 250W
Data Sheet
October 6, 2005
Trim Examples:
To trim down the output of a nominal 30.2V module
(JHW250S30R2) to 28.0V
[(
2× 28
)
− 30.2
]
KΩ
Radj − down = 10×
(
30.2 − 28
)
Radj-down = 117.27 KΩ
To trim up the output of a nominal 30.2V module
(JHW250S30R2) to 31.0V
⎡
⎤
⎛
⎞
31.0
0.04056×31.0 −1.225
⎠
R
adj − up = 9.5944×⎜
⎟ −10 KΩ
⎢
⎣
⎥
⎜
⎟
(
)
⎝
⎦
Rtadj-up = 9181 KΩ
Output Overvoltage Protection - Latching
The output overvoltage protection consists of circuitry
that monitors the voltage on the output terminals. If the
voltage on the output terminals exceeds the over voltage
protection threshold, then the module will shutdown and
latch off. The latch is reset by either cycling the input
power for one second or by toggling the on/off signal for
one second. The protection mechanism is such that the
unit can continue in this condition until the fault is
cleared.
Overtemperature Protection - Latching
These modules feature an overtemperature protection
circuit to safeguard against thermal damage. The circuit
shuts down and latches off the module when the
maximum baseplate reference temperature is exceeded.
The latch is reset by either cycling the input power for
one second or by toggling the on/off signal for one
second. The protection mechanism is such that the unit
can continue in this condition until the fault is cleared.
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module will
begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
10
Tyco Electronics Power Systems
LINEAGEPOWER [ LINEAGE POWER CORPORATION ]
