VQB75 [CUI]
DC-DC Converter; DC-DC变换器
CUI INC 
VQB75- Single Output Brick DC-DC Converter
•
Features
·50-75W isolated output
·Efficiency to 90%
·300KHz switching frequency
·2:1 input range
·Regulated outputs
·Continuous short circuit protection
·Industry standard half-brick package
·Open frame type option
Input
Input Voltage Range
24V 18-36V
48V 36-75V
Under Voltage Lockout
24 Vin power up 17V
power down 15.5V
48Vin power up 34V
power down 32.5V
(see note 4&5)
Positive Logic Remote ON/OFF
Input Filter
PI Type
Output
Voltage Accuracy
±1% max.
Transient Response: 75%-100% Step Load Change
Error Band
±5%
Recover Time
<500us
External Trim Adj. Range
±10%
Ripple & Noise
20MHz BW, 2.5V, 3.3V, 5V
40mV RMS., max
100mV pk-pk., max
±0.03%/°C
Temperature Coefficient
Short Circuit Protection
Line Regulation1
Continuous
±0.2% max
Load Regulation2
±0.2% max
Over Voltage Protection trip Range, % Vo nom.
Current Limit
115-140%
110-140% Nominal Output
General Specifications
Efficiency
see table
Isolation Voltage
Input/Output
Input/Case
1500VDC min.
1500VDC min.
Output/Case
1500VDC min.
Isolation Resistance
Switching Frequency
107Ohm min.
300KHz, Type
Operating Case Temperature
Storage Temperature
-40°C to +100°C
-40°C to +105°C
100°C Typ.
Thermal Shutdown, Case Temp.
Dimensions
1.45x2.28x0.50 inches
(36.8x57.9x12.7mm)
aluminum baseplate with plastic case
Case Material
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
VQB75- Single Output Brick DC-DC Converter
•
NOTES:
1. Measured from high line to low line
2. Measured from full load to zero load
3. Logic compatibility...open collector ref to -input
Module ON...open circuit
Module OFF...<0.8Vdc
4. Suffix “O” to the model number with open frame type
Model
Input
Output
Voltage
1.8VDC
2.5VDC
3.3VDC
5VDC
Output
Current
0.5-25A
0.5-25A
0.5-20A
0.5-15A
0.5-25A
0.5-25A
0.5-20A
I nput Current
No Load
Number
Voltage
Full Load
2259mA
3064mA
3125mA
3472mA
1116mA
1514mA
1563mA
Effic.
83%
85%
88%
90%
84%
86%
88%
Case
QB
QB
QB
QB
QB
QB
QB
VQB75-D24-S1-R8
VQB75-D24-S2R5
VQB75-D24-S3R3
VQB75-D24-S5
VQB75-D48-S1R8
VQB75-D48-S2R5
VQB75-D48-S3R3
18-36VDC
18-36VDC
18-36VDC
18-36VDC
36-75VDC
36-75VDC
36-75VDC
60mA
60mA
70mA
80mA
50mA
50mA
50mA
1.8VDC
2.5VDC
3.3VDC
Case HB
Pin Connection
Pin
Function
Vin
ON/OFF
Case
-Vout
-Sense
Trim
1.
2.
3.
4.
5.
6.
7.
8.
+Sense
+Vout
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
VQB75- Single Output Brick DC-DC Converter
•
Application Notes
Derating:
The operating case temperature range of the VQB75 series is -40°C to +100°C. When operating the VQB75, proper derating or
cooling is needed. Following is the derating curve of VQB75 without heat sink.
Where:
The power dissapation (Pd) is
Pd= Pi - Po = Po (1-n )/ n
The thermal resistances are listed below.
The temperature rise (D T):
D T = Pd * Rca
Remote ON/OFF Control
The VQB75 series allows the user to switch the module on and off electronically with the remote on/off feature. The VQB75
series is available with “positive logic” or “negative logic” options.
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
VQB75- Single Output Brick DC-DC Converter
•
External Output Trimming
Output may optionally be externally trimmed (±10%) with a fixed resistor or an external trimpot as shown.
Output Noise
The output noise is measured with a 10µF tantalum capacitor and a 1.0µF ceramic capacitor across the output.
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
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