Question 1

What are the core electrical topology and power conversion specifications of the Tonglishengda SD2448-25 rectifier?

Accepted Answer

The Tonglishengda SD2448-25 (SKU: TLS-REC-SD2448-25) utilizes an advanced high-frequency soft-switching topology integrated with digital microprocessor control. It accepts an AC input range of 90 to 280 VAC, delivering full rated output power of 1200W within 176–280 VAC. The nominal DC output is -48VDC / 25A with an adjustable voltage range of -42 to -58 VDC. Featuring an efficiency rating exceeding 93.0%, a power factor (PFC) >0.99, and peak-to-peak output ripple noise ≤100mV, it ensures ultra-clean power supply for telecom access networks and optical relay sites.

Question 2

How does the Tonglishengda SD2448-25 support subrack integration, hot-swapping, and parallel load sharing?

Accepted Answer

With standard form-factor dimensions of 132 × 85 × 260 mm (3U height), the SD2448-25 fits standard 19-inch and 21-inch telecom power subracks. It supports true live hot-plugging with integrated inrush current suppression. The module incorporates an autonomous active current-sharing bus; in N+1 redundant parallel arrays, current imbalance remains below ±3%. Complete with hardware-level output overvoltage shutdown, short-circuit hiccup recovery, and reverse-polarity isolation, it allows seamless capacity expansion alongside compatible rectifier platforms.

Question 3

What are the environmental tolerance, surge withstand, and thermal design parameters of the SD2448-25?

Accepted Answer

The SD2448-25 operates across an ambient temperature range of -20°C to +65°C (linear derating above +50°C). It utilizes a built-in temperature-controlled DC brushless fan for forced air cooling, minimizing dust intake and extending MTBF beyond 300,000 hours. The AC stage features multistage surge protection (MOV + GDT) complying with IEC 61000-4-5 (differential mode 2kV, common mode 4kV). With conformal-coated internal PCBs, it withstands 5% to 95% non-condensing relative humidity, ensuring continuous uptime in harsh remote outdoor telecom cabinets.

Key specifications	Value
Nominal Output Voltage	-48 VDC
Output Voltage Range	-42 ~ -58 VDC
Rated Output Power	1200 W
Physical Dimensions Spec	132 × 85 × 260 mm
Power Conversion Efficiency	> 93.0%
AC Input Voltage Range	90 ~ 280 VAC
Operating Temperature	-25°C ~ +65°C
Rated Output Current	25 A
Output Power Factor PF	> 0.99

Tonglishengda SD2448-25 Telecom Switch-Mode Rectifier (-48V 25A 1200W)

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What this product is

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Applications

Carrier edge telecom enclosures

Highway surveillance power junction boxes

Enterprise server room DC backup power

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