Name: MEAN WELL MHB75 series: Half-brick DC/DC converter - MHB75-48S24
Brand: MEAN WELL
SKU: MHB75-48S24
Price: 224.01 USD
Availability: InStock

MEAN WELL MHB75 series: Half-brick DC/DC converter - MHB75-48S24

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Description

MHB75-48S24 — Half-brick DC/DC converter

MHB75-48S24 is a 75 W regulated single-output DC/DC converter with an input range of 36–75 V DC and a 24 V DC output rated from 0 to 3.13 A. It combines 1500 V DC input/output isolation, positive-logic remote ON/OFF, remote sensing and typical ±10% output adjustment in a five-sided shielded aluminum half-brick case.

Download MEAN WELL MHB75 Datasheet (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

MHB75 reference: PDF pages 1–7, edition 2024-04-30. Use the applicable model and connection drawings.

Output and DC input

Rated output	24 V DC; current range 0–3.13 A; rated output power 75 W.
Input voltage	48 V DC nominal; 36–75 V DC operating range (2:1).
Input surge	100 V DC for 100 ms maximum.
Undervoltage lockout	Power-up threshold 34 V DC; power-down threshold 32.5 V DC.
Efficiency	89% typical.
Input current	Full load: 1800 mA. No load: 50 mA.
Input filter	Pi-network.
Ripple and noise	240 mVp-p maximum; measured at 20 MHz bandwidth with a 12-inch twisted-pair wire terminated by a 1 µF ceramic capacitor and a 10 µF tantalum capacitor across the output.
Output accuracy and regulation	Voltage accuracy ±1.0% with the required sense connections; line regulation ±0.2%; load regulation ±0.2%.
Switching frequency	300 kHz typical.
External capacitive load	2000 µF maximum.
Measurement conditions	Unless otherwise stated, specifications are measured at 48 V DC input, rated load and 25°C ambient temperature.

Control, sensing and adjustment

Remote ON/OFF	Standard positive logic: connect R.C. pin 2 to −Vin pin 4 (closed switch, <0.8 V DC) to turn the output OFF; an open circuit turns it ON.
Control reference	R.C. is referenced to −Vin. In the positive-logic example, a high signal at the external NPN transistor base pulls R.C. low and disables the output; this is not a high-voltage command applied directly to R.C.
Remote sense	Connect +Vout pin 9 to +R.S. pin 8 and −Vout pin 5 to −R.S. pin 6 as required by the specification note.
Output trim range	External adjustment ±10% typical of nominal output voltage.
Trim-up connection and calculation	Connect the external resistor between Trim pin 7 and −Vout pin 5. With ΔV = desired voltage − nominal voltage, Rtrim-up = (R1 − R2 × ΔV) / ΔV in kΩ; R1 = 42.215 kΩ and R2 = 16.923 kΩ for this 24 V model.
Trim-down connection and calculation	Connect the external resistor between Trim pin 7 and +Vout pin 9. With ΔV = nominal voltage − desired voltage, Rtrim-down = (R1 − R2 × ΔV) / ΔV in kΩ; R1 = 430 kΩ and R2 = 130 kΩ for this 24 V model.

Protection and operating conditions

Output overcurrent	110–150% of rated output power; current limiting with automatic recovery after the fault is removed.
Output overvoltage	115–140% of rated output voltage, typical; output voltage clamp by a TVS diode.
Short-circuit protection	Continuous short circuit is permitted by the protection specification; automatic recovery after removal of the fault.
Overtemperature protection	Thermal shutdown at 100°C ±5°C case temperature.
Case temperature and cooling	Typical operating case-temperature range −40 to +100°C. Under any operating condition, case temperature must not exceed 100°C; provide the required cooling or derating. This is a case-temperature limit, not an unrestricted ambient-temperature or full-load rating.
Thermal calculation	Use Pd = Pi − Po = Po × (1 − η) / η, with efficiency η as a fraction; Tc = Ta + Pd × Rca. The graph plots dissipated power Pd against ambient temperature and airflow without a heat sink, not rated output power.
Thermal resistance without heat sink	Typical case-to-ambient thermal resistance without a heat sink: 7.12 °C/W at natural convection, 20 ft/min (0.1 m/s); 6.21 at 100 ft/min (0.5 m/s); 5.17 at 200 (1.0); 4.29 at 300 (1.5); 3.64 at 400 (2.0); 2.96 at 500 (2.5); 2.53 at 600 (3.0); 2.37 at 700 (3.5); 2.19 at 800 ft/min (4.0 m/s). All resistance values are in °C/W.
Humidity and storage	Operating humidity 0–95% RH maximum. Storage −55 to +105°C, 0–95% RH.
Temperature coefficient	±0.03%/°C over 0–60°C.

Isolation, approvals and EMC

Isolation voltage	Input–output, input–case and output–case: 1500 V DC each.
Isolation resistance	Input–output: 100 MΩ at 500 V DC, 25°C and 70% RH.
Safety standards	UL60950-1 and EAC TP TC 020/2011 approved. EAC TP TC 004 approval applies to the 48 V nominal-input models.
Series approval marks	The series features list UL / CUL / EAC / CE / UKCA; use the applicable model and standard conditions stated above.
EMC emissions	BS EN/EN55032 (CISPR32) Class A with external components; EAC TP TC 020. The conducted-emission circuit requires the components listed below.
EMC immunity	BS EN/EN61000-4-2, -3, -4, -5, -6 and -8; BS EN/EN55024, light-industry level, criteria A; EAC TP TC 020.
EMC component values	C1 and C2: 33 µF / 100 V, ESR <0.46 Ω each; C3: 2200 pF; L1: 8.3 µH.
EMC circuit connections	C1 and C2 connect across the input on opposite sides of L1. L1 is in series with the positive input line. C3 connects the module-side −Vin node to Case. Refer to the applicable circuit drawing for layout and connections; select component ratings suitable for the application.

Mechanical and installation details

Construction	Half-brick regulated single-output converter with an aluminum case and five-sided metal shielding; industry-standard pinout.
Dimensions	57.9 × 61 × 12.7 mm (L × W × H); 2.28 × 2.40 × 0.50 inches.
Pin assignment	Bottom view: 1 +Vin; 2 R.C.; 3 Case; 4 −Vin; 5 −Vout; 6 −R.S.; 7 Trim; 8 +R.S.; 9 +Vout.
Mounting and pin geometry	Four M3 × 0.5 mounting inserts on a 48.3 × 50.8 mm pattern. Input power-pin spacing is 35.56 mm; R.C.-to-Case pin spacing is 15.24 mm. Pins 5 and 9 are Ø2.03 mm; pins 1, 2, 3, 4, 6, 7 and 8 are Ø1.02 mm. Lead extension is 4.6 mm minimum.
Drawing tolerances	Inches: X.XX ±0.02, X.XXX ±0.010. Millimeters: X.X ±0.5, X.XX ±0.25. Use the bottom-view and side-view drawings for the complete mounting layout.
Optional heat sinks	M-C308: vertical fins, 58 × 60.70 × 21 mm; M-C091: horizontal fins, 61 × 58 × 12.7 mm; M-C092: horizontal fins, 61 × 58 × 25.4 mm. They are optional cooling accessories; confirm thermal performance for the actual load and airflow.
Heat-sink mounting	The assembly drawing shows four screw/washer positions, a heat sink, and a thermal pad or suitable thermal grease. The specified pad is 56.9 × 60 × 0.25 mm and the screw designation is SMP+SW M3x8L. Confirm the supplied mounting items; the drawing does not establish that a complete mounting kit is included.

Reliability, packing and selection

MTBF	1000 K hours typical, MIL-HDBK-217F at 25°C.
Manufacturer warranty	3 years.
Unit weight reference	95 g, catalog packing reference per unit; not a separately measured net-weight claim.
Bulk packing	Antistatic foam packing: 12 units per EPE tray, tray gross weight 1.175 kg; maximum 60 units per carton, carton gross weight 7.2 kg. Carton dimensions 390.9 × 284.8 × 175.7 mm (L × W × H).
Other output options	The series features mention 3.3 V and 15 V outputs as available options. Confirm the complete ordering code and specifications with the supplier; those options do not change this model’s stated output.

Component and system EMC guidance

Complete-system EMC verification	Verify EMC with the converter installed in the final equipment and connected to a representative load. Wiring, assembly and the application affect the result. Follow the model's specified EMC conditions and any required external components; the linked EMI testing guidance does not certify the finished equipment.