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date 04/10/2017
page 1 of 12
SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER
FEATURES
up to 700 W isolated output
industry standard full brick package
2:1 input range (18~36 Vdc, 36~75 Vdc)
single output from 12~48 Vdc
1,500 Vdc isolation
over current, over temperature, over voltage,
and short circuit protections
remote on/off
efficiency up to 92%
input output output output ripple efficiency
MODEL
1
voltage voltage current power and noise
typ range max max max typ
(Vdc) (Vdc) (Vdc) (A) (W) (mVp-p) (%)
VFB600-D24-S12 24 18~36 12 50 600 120 88
VFB600-D24-S24 24 18~36 24 25 600 240 90
VFB600-D24-S28 24 18~36 28 21.5 600 280 90
VFB600-D24-S32 24 18~36 32 19 600 320 91
VFB600-D24-S48 24 18~36 48 12.5 600 480 91
VFB600-D48-S12 48 36~75 12 50 600 120 90
VFB600-D48-S24 48 36~75 24 25 600 240 92
VFB600-D48-S28 48 36~75 28 25 700 280 91
VFB600-D48-S32 48 36~75 32 19 600 320 92
VFB600-D48-S48 48 36~75 48 12.5 600 480 92
Notes: 1. Ripple and noise measured at full load, 20 MHz BW with 10 F tantalum and 1 F ceramic capacitor across the output.
2. An external input capacitor of 220 F is recommended to reduce input ripple voltage.
3. All specifications measured at nominal line, full load, and 25C unless otherwise specified.
PART NUMBER KEY
VFB600 - DXX - SXX X
Base Number Remote On/Off Control
Input Voltage Output Voltageblan = positive logic
N = negative logic
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CUI Inc SERIES: VFB600 DESCRIPTION: DC-DC CONVERTER date 04/10/2017 page 2 of 12
INPUT
parameter conditions/description min typ max units
24 Vdc input models 18 24 36 Vdc
operating input voltage
48 Vdc input models 36 48 75 Vdc
power up 17 Vdc
24 Vdc input
power down 16 Vdc
under voltage shutdown
power up 35 Vdc
48 Vdc input
power down 33 Vdc
power up 38 Vdc
24 Vdc input
power down 40 Vdc
over voltage shutdown
power up 77 Vdc
48 Vdc input
power down 80 Vdc
start-up time 250 ms
models ON (0~0.01 mA)
positive logic
models OFF (1.0~10 mA)
1
on/off
models ON (1.0~10 mA)
negative logic
models OFF (0~0.01 mA)
filter pi filter
60 A time delay fuse for 24 Vin models,
input fuse
30 A time delay fuse for 48 Vin models
Note: 1. See application notes.
OUTPUT
parameter conditions/description min typ max units
12 Vdc output models 470 10,000 F
2
output capacitance
all other models 470 5,000 F
2
line regulation from low line to high line 0.2 %
2
load regulation from full load to no load 0.5 %
2
voltage accuracy 1.5 %
load share accuracy from 50~100% load 10 %
adjustability 60 110 %
48 Vdc input: 12 Vdc, 28 Vdc, 32 Vdc models 300 kHz
switching frequency
all other models 250 kHz
transient response 25% load step change 500 s
temperature coefficient 0.03 %/C
Vout ready: low level, sink current 20 mA
power good (IOC)
Vout not ready: open drain output, applied voltage 50 V
auxiliary output voltage/current 10 3 Vdc, 20 mA max.
Note: 2. Minimum capacitor values are required on the output to maintain the specified regulation.
PROTECTIONS
parameter conditions/description min typ max units
short circuit protection continuous
over current protection 110 150 %
over voltage protection 115 140 %
over temperature protection shutdown 110 C
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