®
IMX35 Series Data Sheet
35 Watt Quad-Output DC-DC Converters
Progr. Input Undervoltage Lockout PUL
A special feature of the converters (with Rev. BA or later) is the
adjustable undervoltage lockout protection, which protects
the converter (and the system) from high current caused by
operation at low input voltages. This ensures easier start-up
in distributed power systems.
The table below shows the band of switch on/off and the
hysteresis.
Table 9: Trigger level and hysteresis (pin 1 left open)
Model
20IMX35
40IMX35
70IMX35
110IMX35
Trigger level
7 to 8
14 to 15.5
31 to 34
42 to 50
Hysteresis
<0.5
<1
<3
<8
Unit
V
The undervoltage lockout levels may be programmed by using
an external resistor
R
PUL
between PUL and Vi – to increase the
preset levels as specified in table 10.
Table 10: Typical values for R
PUL
and the respective lockout
voltage for input voltage.
20 IMX35
R
PUL
[kW]
V
i min
[V]
≤
8
10
12
14
16
70 IMX35
R
PUL
[kW]
V
i min
[V]
31
40
50
55
40 IMX35
R
PUL
[kW]
V
i min
[V]
≤
15.5
22
26
28
32
110 IMX35
R
PUL
[kW]
V
i min
[V]
42
50
60
75
∞
39
19
13
9.1
∞
43
16
10
0
∞
270
110
80
∞
270
120
51
BCD20009-G Rev AC, 06-May-2013
Page 10 of 15
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