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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
VQB75- Single Output Brick DC-DC Converter
Input
Input Voltage Range Under Voltage Lockout 24V 18-36V 48V 36-75V 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 Transient Response: 75%-100% Step Load Change Error Band Recover Time External Trim Adj. Range Ripple & Noise 20MHz BW, 2.5V, 3.3V, 5V Temperature Coefficient Short Circuit Protection Line Regulation 1 Load Regulation 2 Over Voltage Protection trip Range, % Vo nom. Current Limit 1% max. 5% <500us 10% 40mV RMS., max 100mV pk-pk., max 0.03%/C Continuous 0.2% max 0.2% max 115-140% 110-140% Nominal Output
General Specifications
Efficiency Isolation Voltage Input/Output Input/Case Output/Case see table 1500VDC min. 1500VDC min. 1500VDC min. 10 7 Ohm min. 300KHz, Type -40C to +100C -40C to +105C 100C Typ. 1.45x2.28x0.50 inches (36.8x57.9x12.7mm) Case Material aluminum baseplate with plastic case
Isolation Resistance Switching Frequency Operating Case Temperature Storage Temperature Thermal Shutdown, Case Temp. Dimensions
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
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NOTES: 1. Measured from high line to low line 2. Measured from full load to zero load
VQB75- Single Output Brick DC-DC Converter
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 Number VQB75-D24-S1-R8 VQB75-D24-S2R5 VQB75-D24-S3R3 VQB75-D24-S5 VQB75-D48-S1R8 VQB75-D48-S2R5 VQB75-D48-S3R3
Input Voltage 18-36VDC 18-36VDC 18-36VDC 18-36VDC 36-75VDC 36-75VDC 36-75VDC
Output Voltage 1.8VDC 2.5VDC 3.3VDC 5VDC 1.8VDC 2.5VDC 3.3VDC
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 Full Load 60mA 2259mA 60mA 3064mA 70mA 3125mA 80mA 50mA 50mA 50mA 3472mA 1116mA 1514mA 1563mA
Effic. 83% 85% 88% 90% 84% 86% 88%
Case QB QB QB QB QB QB QB
Case HB
Pin Connection
Pin 1. 2. 3. 4. 5. 6. 7. 8. Function Vin ON/OFF Case -Vout -Sense Trim +Sense +Vout
V-Infinity, LLC, 9615 SW Allen Blvd Suite 103, Beaverton, OR 97005
www.v-infinity.com
1-866-372-1258
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Application Notes
Derating:
VQB75- Single Output Brick DC-DC Converter
The operating case temperature range of the VQB75 series is -40C to +100C. 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 )/ The thermal resistances are listed below.
n
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 10F tantalum capacitor and a 1.0F 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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