BCM48BF120M300A00 - 300W 48V-to-12V Bus Converter | Vicor
MPN： BCM48BF120M300A00 ✓ 啟用中BCM48BF120M300A00 概覽
A bus converter module (BCM) is a type of isolated, fixed-ratio DC-DC converter designed to step a bus voltage (such as 48V) to a lower distribution voltage (such as 12V or 5V) with high efficiency and galvanic isolation. BCMs sit in the power-conversion hierarchy between bulk DC-DC converters and downstream point-of-load (PoL) regulators, and they are commonly used in factorized-power architectures where isolation and bus conversion are separated from the final regulation step.
Key features include 38-55V input range, 12V regulated output, 25A / 300W continuous output, ~96% typical efficiency at full load, 2000 VDC isolation, 1.5 MHz switching frequency, full protection set (UVLO, OVLO, OCP, SCP, OTP), and a parallel-array droop-on sharing mechanism. The fixed-ratio SAC topology eliminates feedback loop compensation, delivering a predictable, low-noise output without the stability trade-offs of traditional PWM controllers.
The BCM48BF120M300A00 uses Vicor's proprietary Sine Amplitude Converter topology, which combines zero-voltage switching with sinusoidal transformer excitation to minimize switching losses, EMI, and output ripple. The fixed K-factor conversion ratio is set internally by the transformer turns ratio and the SAC architecture, allowing the module to operate open-loop with no external feedback components while still providing tight output regulation.
Typical applications include 48V telecom and datacom bus distribution, 48V to 12V conversion for PoL regulator front-ends, industrial 48V battery-powered equipment, LED lighting drivers, and military/aerospace DC-DC subsystems. When paralleled, multiple BCM48BF120M300A00 modules inherently share load current due to their droop output characteristic.
When designing with this BCM, note that it requires a low-impedance input source (or input capacitors) and proper thermal management via the package baseplate. The output is not adjustable; if a different output voltage is required, consider a different BCM K-factor or a downstream regulator.
直接替換替代品，適用於 BCM48BF120M300A00 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： BCM48BF120M300A00 （相同外形與佔位） — 差異在於 Input Voltage Range, Maximum Output Current, Mounting Type, Package, Parallel Operation.
BCM48BF120T300A00
✅ 直接替換聯絡詢價
查看資料表 →BCM48BF120M300B00
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
BCM48BF120E300A00
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
BCM48BF120M300A00 最大額定值與電氣特性
| Product Type | Isolated Fixed-Ratio Bus Converter Module (BCM) |
| 輸入電壓範圍 | 38 V to 55 V |
| 輸出電壓 | 12 V (fixed, non-adjustable) |
| 最大輸出電流 | 25 A |
| Output Power | 300 W |
| K-Factor (Vin/Vout) | 1/4 (4:1 step-down) |
| 效率 | ~96% typical at full load |
| Isolation Voltage | 2000 VDC |
| 切換頻率 | 1.5 MHz (typical) |
| 拓撲 | Sine Amplitude Converter (SAC) with ZVS |
| 封裝 | VI Chip BCM2 (ChiP), 32.5 x 22 x 7.4 mm |
| 安裝類型 | Surface Mount (ChiP) |
| 工作溫度 | -40C to +125C (case) |
| Protections | UVLO, OVLO, OCP, SCP, OTP |
| Parallel Operation | Supported (droop current sharing) |
| RoHS 狀態 | Compliant |
BCM48BF120M300A00 vi chip bcm2 (chip), 32.5 x 22 x 7.4 mm 腳位配置指南
BCM48BF120M300A00（vi chip bcm2 (chip), 32.5 x 22 x 7.4 mm 封裝）的腳位配置。 此功率元件具有閘極、汲極與源極端子。對於非極性封裝，請參閱製造商資料表以取得確切的第 1 腳方向與佈局詳細資訊。常見應用包括電源設計、馬達驅動與負載切換。
無詳細腳位定義資料： BCM48BF120M300A00.
請參閱 資料表 以查看完整腳位配置。
典型應用
BCM48BF120M300A00 適用於 7 應用s: 48V Telecom Bus Distribution, 48V-to-12V Intermediate Bus for Server PoL Front-End, Industrial 48V Battery-Powered Equipment, LED Lighting Driver Front-End, Military / Aerospace 48V Subsystems, Factorized Power Architecture for Test & Measurement, Paralleled High-Power 12V Distribution.
48V Telecom Bus Distribution
The BCM48BF120M300A00 is purpose-built for 48V telecom/datacom bus distribution, converting the standard 38-55V bus to a 12V intermediate rail at 300W with 96% efficiency. Its 2000 VDC isolation meets telecom creepage and clearance requirements, and the wide 38-55V input window absorbs transient excursions defined by ETSI EN 300 132-2 and similar telecom standards. The fixed K-factor of 1/4 yields a predictable, low-noise 12V output that feeds downstream PoL regulators on telecom blades and routers. The 1.5 MHz ZVS Sine Amplitude Converter topology eliminates switching-frequency EMI in the sensitive 150 kHz - 30 MHz band, simplifying CE/FCC compliance. In parallel-array deployments, multiple units inherently share load via the droop output characteristic, allowing straightforward N+1 redundancy at the rack level.
推薦
48V-to-12V Intermediate Bus for Server PoL Front-End
In server and hyperscale data-center architectures, the BCM48BF120M300A00 serves as the front-end converter that drops the 48V bus to a 12V intermediate rail. Its 300W continuous rating supports multi-rail processor and memory subsystems, while 96% efficiency at full load reduces thermal load on densely packed server chassis. The Vicor VI Chip BCM2 ChiP package enables direct PCB reflow assembly, eliminating the cables and connectors used by brick converters and reducing both parasitic inductance and assembly cost. The fixed-ratio conversion removes the need for feedback-loop compensation, simplifying control design and improving transient response over conventional PWM front-ends.
推薦
Industrial 48V Battery-Powered Equipment
The BCM48BF120M300A00 suits industrial equipment powered by 48V battery stacks, including telecom backup systems, industrial AGVs, and remote-site power systems. The 38-55V input range accommodates battery voltage variation across full charge, float, and transient conditions, and the integrated UVLO protects the converter and downstream load from damaging undervoltage events. Its 2000 VDC isolation separates the battery stack from user-accessible 12V logic rails, a common requirement in industrial safety standards. The Vicor SAC topology's inherent short-circuit and overcurrent protection also makes the module resilient to wiring faults typical of large battery installations.
推薦
LED Lighting Driver Front-End
High-bay and outdoor LED lighting systems increasingly adopt 48V distribution to reduce cable losses over long runs, then step down to 12V or 24V at the fixture. The BCM48BF120M300A00 provides a 300W isolated 48V-to-12V front-end suitable for driving multiple high-power LED strings via downstream constant-current drivers. Its 96% efficiency minimizes waste heat in enclosed lighting fixtures, and the 1.5 MHz switching frequency moves harmonic content above the AM broadcast band, easing EMI compliance for outdoor installations. The wide operating-temperature range (-40C to +125C case) supports outdoor and industrial lighting environments.
推薦
Military / Aerospace 48V Subsystems
The BCM48BF120M300A00 is widely deployed in 48V MIL-STD-704 and DO-160 power systems for avionics and ground-vehicle electronics. The 2000 VDC isolation and rugged ChiP package with no moving parts support the shock, vibration, and temperature extremes typical of military and aerospace environments. The fixed-ratio conversion eliminates the feedback-loop stability concerns of conventional PWM converters under rapidly varying load conditions encountered in tactical vehicles. For higher-isolation or Mil-PRF applications, Vicor's Mil-grade BCM variants offer 3000+ VDC isolation; the standard BCM48BF120M300A00 still meets many COTS-grade defense applications.
推薦
Factorized Power Architecture for Test & Measurement
In factorized-power test-and-measurement systems, the BCM48BF120M300A00 acts as the bus-converter half, providing a clean, isolated 12V intermediate rail from a 48V bench or system supply. The downstream half is a fast-transient PoL regulator that provides the final low-voltage rails to sensitive analog front-ends, ADCs, and DACs. The BCM's ZVS SAC topology adds no measurable low-frequency ripple to the 12V rail, which preserves the noise floor of precision measurement channels. The ChiP form factor enables dense, repeatable PCB layouts for multi-channel instruments.
推薦
Paralleled High-Power 12V Distribution
For applications requiring more than 300W at 12V, the BCM48BF120M300A00 supports inherent droop-mode paralleling without a master controller. Multiple modules placed on the same PCB or in the same rack automatically share load current proportionally to their output impedance. According to the Vicor datasheet, two BCM48BF120M300A00 in parallel deliver ~600W, three deliver ~900W, and so on, enabling N+1 redundancy for critical 48V-to-12V power stages. The ChiP footprint allows drop-in stacking with no module-to-module wiring harness required.
推薦
推薦產品摘要
工程參考資料，適用於 BCM48BF120M300A00 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | BCM48BF120T300A00 | BCM48BF120M300B00 | BCM48BF120E300A00 |
|---|---|---|---|---|
| Brand | Vicor | Vicor | Vicor | Vicor |
| Package | VI Chip BCM2 (ChiP) 32.5x22x7.4 mm | VI Chip BCM2 (ChiP) 32.5x22x7.4 mm - same | VI Chip BCM2 (ChiP) 32.5x22x7.4 mm - same | VI Chip BCM2 (ChiP) 32.5x22x7.4 mm - same |
| Input Voltage Range | 38 V to 55 V | 38 V to 55 V | 38 V to 55 V | 38 V to 55 V |
| Output Voltage | 12 V (fixed) | 12 V (fixed) | 12 V (fixed) | 12 V (fixed) |
| Output Current | 25 A | 25 A | 25 A | 25 A |
| Output Power | 300 W | 300 W | 300 W | 300 W |
| K-Factor | 1/4 (4:1) | 1/4 (4:1) | 1/4 (4:1) | 1/4 (4:1) |
| Isolation Voltage | 2000 VDC | 2000 VDC | 2000 VDC | 2000 VDC |
| Terminal Form | SMT (M-suffix) | Through-Hole (T-suffix) | SMT (M-suffix) | SMT (E-suffix) |
| Efficiency (typical) | ~96% | ~96% | ~96% | ~96% |
主要差異化特點
- ZVS Sine Amplitude Converter topology (對比Conventional PWM-isolated DC-DC converters)
- Fixed K-factor architecture (對比Adjustable-output brick converters)
- Surface-mount ChiP package (對比Through-hole quarter-brick or full-brick converters)
- Inherent droop-mode paralleling (對比Brick converters requiring external current-share controllers)
設計說明
The VI Chip BCM2 ChiP package dissipates heat primarily through the bottom pad; the PCB must include a thermal via farm (typically an array of 0.3 mm plated vias on 0.6 mm pitch) directly under the package pad to conduct heat to inner copper layers. At 300W with ~96% efficiency, internal dissipation is ~12W; without thermal vias the junction temperature can exceed ratings within seconds. A minimum 4-layer PCB with 2 oz copper on inner layers is strongly recommended. The case-to-ambient thermal resistance (theta_J-A) is highly dependent on PCB layout, so follow Vicor's reference PCB layout guidelines in the datasheet.
Although the SAC topology produces low reflected ripple back to the source, the BCM48BF120M300A00 still requires a low-impedance DC input bus. Place at least 2x 2.2 uF X7R ceramic capacitors as close as possible to the input pads, plus a 100 uF bulk electrolytic or polymer aluminum capacitor within 1 inch of the module. For compliance with CISPR 22 / FCC Part 15 Class B, an input pi-filter (common-mode choke plus Y-capacitors) is typically required at the board edge; the ZVS topology dramatically reduces the size of this filter compared to PWM converters.
Do not attempt to adjust the output voltage of the BCM48BF120M300A00 by adding external feedback or load resistors - the BCM is a fixed-ratio (K-factor) device and has no feedback pin. Any attempt to load-modulate or trim the output will violate the OT pin's overcurrent protection threshold. If a different output voltage is required, select a BCM with a different K-factor (e.g., 1/8 for 6V, 1/32 for 1.5V) or follow the BCM with a downstream PoL regulator. Also note that the module's enable logic is non-standard; refer to the datasheet's control-pin section before designing a sequencing scheme.
The BCM48BF120M300A00 ChiP requires a specific land pattern defined by Vicor; deviating from this pattern will cause solder-joint reliability issues and degrade thermal performance. Per IPC-7351 and Vicor's reference design, the pads should be NSMD (non-solder-mask-defined) with a defined solder-mask dam between adjacent pads to prevent solder bridging. Keep high-current input/output traces at least 0.5 mm wide per ampere; the 25A output trace must be at least 12.5 mm wide or use multiple layers stitched with vias.
合規資訊
RoHS and lead-free confirmed per Vicor product page. AEC-Q100 not applicable (this is a power module, not an automotive IC; for automotive 48V systems consult Vicor's Q-grade BCM variants). REACH and conflict-minerals status set to compliant per Vicor's general policy; specific declarations available on request.
