Cincon CQB75W8-36SXX-CMFC(D) Series DC/DC Converter
The Cincon CQB75W8 CMFC(D) Series is a robust range of 75 W isolated DC/DC converters designed to deliver stable, regulated DC power from wide and fluctuating input sources. Featuring an 8:1 ultra-wide DC input range, the series ensures reliable performance across demanding electrical conditions while maintaining high efficiency and low power lo...
Read MoreThe Cincon CQB75W8 CMFC(D) Series is a robust range of 75 W isolated DC/DC converters designed to deliver stable, regulated DC power from wide and fluctuating input sources. Featuring an 8:1 ultra-wide DC input range, the series ensures reliable performance across demanding electrical conditions while maintaining high efficiency and low power loss.
Operating from 9.5–75 Vdc input (36 Vdc nominal), the CQB75W8 series is available with single output voltage options from 12 Vdc to 48 Vdc, providing flexibility for a wide variety of low-voltage power requirements. Fully regulated outputs, low no-load power consumption, and excellent transient response help protect sensitive downstream electronics.
The converters utilise a chassis-mount, baseplate-cooled design for completely fanless operation and long service life. Comprehensive protection features, high isolation strength, and compliance with international safety, EMC, and railway standards make the CQB75W8 CMFC(D) Series a dependable solution for professional DC/DC power conversion applications.
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Features
- Input voltage: 9.5–75 Vdc (36 Vdc nominal, 8:1 input range)
- Output voltage options: 12Vdc, 15Vdc, 24Vdc, 28Vdc, or 48Vdc (single output)
- Output current up to 6.25A
- Galvanically isolated input and output (3000 Vac I/O isolation)
- High efficiency: up to 90%
- Chassis-mount, baseplate-cooled design (fanless)
- Wide operating case temperature: –40 °C to +105 °C
- Remote On/Off control (positive or negative logic)
- Safety approvals: IEC/EN/UL 62368-1 (reinforced insulation)
- Fire & smoke compliance: EN 45545-2 (HL1–HL3)
Specifications
| ABSOLUTE MAXIMUM RATINGS | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device |
Min. |
Typ. |
Max. |
Units |
| Input Voltage | Continuous | All | -0.3 | 75 | Vdc | |
| Input Surge Voltage | 100ms max. | All | 100 | Vdc | ||
| Operating Case Temperature | At the center part of base plate | All | -40 | 105 | ℃ | |
| Storage Temperature | All | -40 | 105 | ℃ | ||
| INPUT CHARACTERISTICS | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device | Min. |
Typ. |
Max. |
Units |
| Operating Input Voltage | All | 9.5 | 36 | 75 | Vdc | |
| Input Under Voltage Lockout | ||||||
| Turn-On Voltage Threshold | Full Load | All | 8.4 | 8.8 | 9.3 | Vdc |
| Turn-Off Voltage Threshold | Full Load | All | 7.5 | 7.9 | 8.4 | Vdc |
| Lockout Hysteresis Voltage | Full Load | All | 0.9 | Vdc | ||
| Maximum Input Current | Vᵢₙ=9.5V, Full load | All | 6.7 | A | ||
| No-Load Input Current | Vᵢₙ=36V, Io=0A | See Model Number Table | mA | |||
| OUTPUT CHARACTERISTICS | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device |
Min. | Typ. |
Max. |
Units |
| Voltage Set Point Accuracy | Vᵢₙ=36V, Full load, Tc=25℃ | All | -1.0 | +1.0 | % | |
| Output Voltage Regulation | ||||||
| Load Regulation | Full load to no load | All | ±0.2 | % | ||
| Line Regulation | Vᵢₙ=High line to low line, full load | All | ±0.2 | % | ||
| Temperature Coefficient | Tc=-40℃ to 105℃ | All | ±0.02 | %/℃ | ||
| Output Voltage Ripple and Noise (5Hz to 20MHz bandwidth) | ||||||
|
Peak-to-Peak
RMS. |
Full load, 1uF ceramic capacitors |
12Vo 12Vo |
150 80 |
mV | ||
| Output Current Range | Vᵢₙ= 9.5 to 75V | See Model Number Table | A | |||
| Over Current Protection | Hiccup Mode. Auto recovery | All | 110 | 150 | 210 | % |
| Short Circuit Protection | All | Continuous, Auto Recovery. | ||||
| External Load Capacitance | Full load (resistive) | See Model Number Table | uF | |||
| Output Voltage Trim Range | Pₒ≦max. rated power, Iₒ≦Iₒ_ₘₐₓ. | All | -20 | +15 | % | |
| Output Voltage Remote Sense Range | Pₒ≦max. rated power, Iₒ≦Iₒ_ₘₐₓ. % of nominal Vo |
All | +15 | % | ||
| Over Voltage Protection | Limited voltage, % of nominal Vo | All | 117 | 125 | 140 | % |
| EFFICIENCY | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device |
Min. |
Typ. |
Max. |
Units |
| 100% Load | Vᵢₙ=36V | See Model Number Table | % | |||
| DYNAMIC CHARACTERISTICS | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device |
Min. |
Typ. |
Max. |
Units |
| Output Voltage Current Transient | ||||||
| Error Band | 75% to 100% of Io_max step load change di/dt=0.1A/us (within 1% Vout nominal) |
All | ±5 | % | ||
| Recovery Time | 250 | us | ||||
| Turn-On Delay and Rise Time | Full load (Constant resistive load) | |||||
| Turn-On Delay Time, From On/Off Control |
Vₒₙ/ₒff to 10%Vo_set, Remote on | All | 20 | ms | ||
| Turn-On Delay Time, From Input | Vᵢₙ_ₘᵢₙ to 10%Vo_set, Power up | All | 20 | ms | ||
| Output Voltage Rise Time | 10%Vₒ_ₛₑₜ to 90%Vₒ_ₛₑₜ | All | 10 | ms | ||
| ISOLATION CHARACTERISTICS | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device |
Min. |
Typ. |
Max. |
Units |
| Isolation Voltage (100% factory Hi-Pot tested @2sec.) |
1 Minute; Input to output | All | 3000 | Vac | ||
| 4200 | ||||||
| 1 Minute; Input to case (base plate) | 2100 | |||||
| 3000 | ||||||
| 1 Minute; Output to case (base plate) | 1500 | |||||
| 2100 | ||||||
| Isolation Resistance | Input to output | All | 100 | MΩ | ||
| Isolation Capacitance | Input to output Input to case (base plate) Output to case (base plate) |
All | 15000 16000 23000 |
pF | ||
| FEATURE CHARACTERISTICS | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device |
Min. |
Typ. |
Max. | Units |
| Switching Frequency | Pulse wide modulation (PWM), Fixed | All | 180 | 200 | 220 | KHz |
| On/Off Control, Remote On/Off Logic, Refer to –Vin pin | ||||||
| Logic High (Module Off) | Vₒₙ/ₒff at Iₒₙ/ₒff>1.0mA | All | 0 | 1.0 | V | |
| Logic Low (Module On) | Vₒₙ/ₒff at Iₒₙ/ₒff=0.0uA, Pin open=on | All | 4.0 | 7.5 | ||
| On/Off Control, Negative Remote On/Off Logic, Refer to -Vin Pin | ||||||
| Logic High (Module Off) | Vₒₙ/ₒff at Iₒₙ/ₒff=0.0uA, Pin open=off | All | 4.0 | 7.5 | V | |
| Logic Low (Module On) | Vₒₙ/ₒff at Iₒₙ/ₒff=1.0mA | 0 | 1.0 | |||
| On/Off Current (for both remote on/off logic) | Iₒₙ/ₒff at Vₒₙ/ₒff=0V | All | 0.3 | 1 | mA | |
| Leakage Current (for Both Remote On/Off Logic) | Logic high, Vₒₙ/ₒff=15V | All | 30 | uA | ||
| Off Converter Input Current | Shutdown input idle current | All | 5 | 10 | mA | |
| Over Temperature Shutdown | Temperature at the center part of base plate, non-latching | All | 110 | ℃ | ||
| Over Temperature Recovery | 100 | |||||
| GENERAL SPECIFICATIONS | ||||||
|---|---|---|---|---|---|---|
| Parameter | Notes and Conditions |
Device |
Min. |
Typ. |
Max. |
Units |
| MTBF | Io=100% of Io_max; MIL-HDBK - 217F_Notice 1, GB, 25℃ |
36S12 36S15 36S24 36S28 36S48 |
526 585 577 568 594 |
K hours |
||
| Weight |
-CMFC |
215 |
grams | |||
| Base plate Material | Aluminum | |||||
| Potting Material | UL 94V-0 (DC Module) | |||||
| Shock/Vibration | EN 50155 (EN 61373) Compliant (Except -HD) | |||||
| Humidity | 95% RH max. Non Condensing | |||||
| Altitude | 5000m Operating Altitude, 12000m Transport Altitude | |||||
| Thermal Shock | MIL-STD-810F | |||||
| Fire & Smoke | EN 45545-2 Compliant | |||||
| EMI | EN 55032 & EN 50155 Compliant | Class A | ||||
| ESD | EN 61000-4-2 | Level 3: Air ±8kV, Contact ±6kV | Perf. Criteria A | |||
| Radiated immunity | EN 61000-4-3 | Level 3: 80~1000MHz, 20V/m | Perf. Criteria A | |||
| Fast Transient | EN 61000-4-4 | Level 3: On power input port, ±2kV | Perf. Criteria A | |||
| Surge | EN 61000-4-5 | Level 4: Line to earth, ±4kV, Line to line, ±2kV | Perf. Criteria A | |||
| Conducted immunity | EN 61000-4-6 | Level 3: 0.15~80MHz, 10V | Perf. Criteria A | |||
| Interruptions of Voltage Supply | EN 50155 | Class S3: 20ms interruptions | Perf. Criteria A | |||
| Supply Change Over | EN 50155 | Class C2: During a supply break of 30 ms | Perf. Criteria A | |||
| Application Note Link CQB75W8-36S CMFC(D) Series App Notes Packaging Information Link Packaging Information |
||||||
| IMMUNITY TO ENVIRONMENTAL CONDITIONS | ||||
|---|---|---|---|---|
| Phenomenon | EN 50155; 2021 Reference Clause(s) |
Reference Standard |
Test Conditions |
Result |
| Low Temperature Start-up test |
13.4.4 | EN 60068-2-1 | Class OT6 Temperature: -40℃ Duration: 2 hrs |
Pass |
| Dry Heat Test | 13.4.5 | EN 60068-2-2 |
Class OT6 & Cycle A |
Pass |
| Low Temperature Storage Test |
13.4.6 | EN 60068-2-1 | Temperature: -40℃ Duration: 16 hrs |
Pass |
| Cyclic Damp Heat Test | 13.4.8 | EN 60068-2-30 | Temperature: 25℃ - 55℃ Humidity: 90% RH Duration: 48 hrs |
Pass |
| Functional Random Vibration Test | 13.4.10 | EN 61373 | Frequency range: 5 ~ 150 Hz Vertical: 1.01 𝑚⁄𝑠² Transverse: 0.450 𝑚⁄𝑠² Longitudinal: 0.700 𝑚⁄𝑠² Duration: 10 min / axis |
Pass |
| Simulated Long Life Test at Increased Random Vibration Levels |
13.4.10 | EN 61373 | Frequency range: 5 ~ 150 Hz Vertical: 5.72 𝑚⁄𝑠² Transverse: 2.55 𝑚⁄𝑠² Longitudinal: 3.96 𝑚⁄𝑠² Duration: 5 hrs / axis |
Pass |
| Shock Test | 13.4.10 | EN 61373 | ±Vertical: 30 𝑚⁄𝑠² ±Transverse: 30 𝑚⁄𝑠² ±Longitudinal: 50 𝑚⁄𝑠² Duration: 30ms x18 (Each axis 3 shocks) |
Pass |
| EN45545-2 FIRE & SMOKE TEST CONDITIONS | |||
|---|---|---|---|
| Item | Notes and Conditions |
Standard |
Hazard Level |
| R22 | Oxygen Index Test | EN 45545-2: 2013+A1:2015 EN ISO 4589-2: 2017 |
HL1, HL2, HL3 |
| Smoke Density Test | EN 45545-2: 2013+A1:2015 EN ISO 5659-2: 2017 |
HL1, HL2, HL3 | |
| Smoke Toxicity Test | EN 45545-2: 2013+A1:2015 NF X70-100-1&2: 2006 |
HL1, HL2, HL3 | |
| R23 | Oxygen Index Test | EN 45545-2: 2013+A1:2015 EN ISO 4589-2: 2017 |
HL1, HL2, HL3 |
| Smoke Density Test | EN 45545-2: 2013+A1:2015 EN ISO 5659-2: 2017 |
HL1, HL2, HL3 |
|
| Smoke Toxicity Test | EN 45545-2: 2013+A1:2015 NF X70-100-1&2: 2006 |
HL1, HL2, HL3 |
|
| R24 | Oxygen Index Test | EN 45545-2: 2013 EN ISO 4589-2 |
HL1, HL2, HL3 |
| R25 | Glow - Wire Test | EN 45545-2:2020+A1:2023 EN 60695-2-11:2014 |
HL1, HL2, HL3 |
| R26 | Vertical Flame Test | EN 45545-2: 2013+A1:2015 EN 60695-11-10: 2013 |
HL1, HL2, HL3 |
Selection Table
| MODEL NUMBER | INPUT VOLTAGE | OUTPUT VOLTAGE | OUTPUT CURRENT | INPUT CURRENT | % EFF. | CAPACITOR LOAD MAX | ||
|---|---|---|---|---|---|---|---|---|
| MIN. | MAX. | NO LOAD | FULL LOAD | |||||
| CQB75W8-36S12☐-CMFD |
9.5-75 VDC |
12 VDC |
0 mA | 6.25 A | 10 mA | 2315mA | 90 | 14000μF |
| CQB75W8-36S15☐-CMFD |
9.5-75 VDC |
15 VDC |
0 mA | 5 A | 10 mA | 2315mA | 90 | 10000μF |
| CQB75W8-36S24☐-CMFD |
9.5-75 VDC |
24 VDC |
0 mA | 3.12 A | 12 mA | 2311mA | 90 | 3900μF |
| CQB75W8-36S28☐-CMFD |
9.5-75 VDC |
28 VDC |
0 mA | 2.67 A | 12 mA | 2307mA | 90 | 3200μF |
| CQB75W8-36S48☐-CMFD |
9.5-75 VDC |
48 VDC |
0 mA | 1.56 A | 12 mA | 2311mA | 90 | 1100μF |
NOTE:
1. Nominal input voltage 36 VDC.
2. ☐ = N or None.
3. VR1 is used for output voltage adjustment.
4. Refer to application note for thermal resistance and derating information.
5. TVS is included for input surge voltage protection.
6. Recommend an External fuse for input reverse polarity protection (shunt diode is included inside).
7. Output connector CN3 wafer with TAIWAN KING pin terminal P110I series and mate with JST housing PH series or equivalent.
8. CN1 & CN2 connection: DINKLE EK500V-04P series or equivalent, suitable electric wire: 24~12AWG (IEC 0.5~2.5mm2).
PART NUMBER
| SERIES | NOMINAL INPUT VOLTAGE | NUMBER OF OUTPUTS | NOMINAL OUTPUT VOLTAGE | REMOTE ON/OFF LOGIC | CHASSIS MOUNT TYPE | HEATSINK | |
|---|---|---|---|---|---|---|---|
| CQB75W8- | II | O | XX | L | -YYY | Z | +WWW |
| CQB75W8 |
36 : 36 VDC |
S：Single |
12 : 12VDC |
None : Positive N：Negative |
CMF : Chassis Mount Built in Filter |
C： |
None：Blank HS：Heatsink HD：Heatsink+Din Rail |
Part Number Example:
CQB75W8-36S12N-CMFD: Chassis Mount, 75W, 8:1 9.5-75Vdc Input, Single 12Vdc Output, Negative Logic, with cover.
Technical Drawings
Warranty & Returns
Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.