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date 03/14/2013
page 1 of 4
SERIES: VHB350 DESCRIPTION: DC-DC CONVERTER
FEATURES
up to 350 W isolated output
industry standard half brick package
2:1 input range (18~36 V, 36~75 V)
single output from 3.3~28 V
1,500 V isolation
over current, over temperature, over voltage,
and short circuit protections
remote on/off
efficiency up to 92.5%
RoHS
input output output output ripple efficiency
MODEL
1
voltage voltage current power and noise
range max max max typ
(Vdc) (Vdc) (A) (W) (mVp-p) (%)
VHB350-D24-S3R3 18 ~ 36 3.3 70 231 100 88
VHB350-D24-S5 18 ~ 36 5 70 350 100 89.5
VHB350-D24-S12 18 ~ 36 12 29.2 350 120 91.5
VHB350-D24-S24 18 ~ 36 24 14.6 350 280 90
VHB350-D24-S28 18 ~ 36 28 12.5 350 280 91
VHB350-D48-S3R3 36 ~ 75 3.3 70 231 100 89
VHB350-D48-S5 36 ~ 75 5 70 350 100 91
VHB350-D48-S12 36 ~ 75 12 29.2 350 120 92.5
VHB350-D48-S24 36 ~ 75 24 14.6 350 280 91.5
VHB350-D48-S28 36 ~ 75 28 12.5 350 280 92.5
Notes: 1. Ripple and noise are measured at 20 MHz BW with 10F tantalum capacitor and 1F ceramic capacitor across output
PART NUMBER KEY
VHB350 - DXX - SXX X
Base Number Input Voltage Output Voltage Remote On/Off ControlBlan = Positive Logic
N = Negative Logic
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CUI Inc SERIES: VHB350 DESCRIPTION: DC-DC CONVERTER date 03/14/2013 page 2 of 4
INPUT
parameter conditions/description min typ max units
18 24 36 Vdc
operating input voltage
36 48 75 Vdc
24 V input 50 Vdc
1
surge voltage
48 V input
24 V input 16 17 18 Vdc
power up
48 V input 34 35 36 Vdc
under voltage lockout
24 V input 15 16 17 Vdc
power down
48 V input 32 33 35 Vdc
24 V input 38 Vdc
turn on
48 V input 77 Vdc
over voltage protection
24 V input 40 Vdc
turn off
48 V input 80 Vdc
positive logic remote on/off see note 2
filter PI type
Notes: 1. 100 ms max
2. logic compatibility, open collector ref to -input
Module ON, >3.5 to 75 Vdc or open circuit
Module OFF, <1.2 Vdc
OUTPUT
parameter conditions/description min typ max units
line regulation measured from high line to low line 0.2 %
load regulation measured from full load to zero load 0.2 %
voltage accuracy 1.5 %
transient response 25% step load change 500 s
3
adjustability 10 %
3.3 and 5 V models 300 kHz
switching frequency
all other models 330 kHz
temperature coefficient 0.03 %/C
Notes: 3. trim-up: connect a resistor between the trim pin and +Sense
trim-down: connect a resistor between the trim pin and -Sense
PROTECTIONS
parameter conditions/description min typ max units
over voltage protection %Vo 115 140 %
short circuit protection continuous
current limit 105 140 %
thermal shutdown case temp. 110 C
SAFETY AND COMPLIANCE
parameter conditions/description min typ max units
input to output 1,500 Vdc
isolation voltage input to case 1,500 Vdc
output to case 1,500 Vdc
isolation resistance 10 M
isolation capacitance 1,000 pF
safety approvals UL60950-1, EN60950-1
RoHS compliant yes
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