DBM20
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DBM20 Series https://product.tdk.com/en/power/dbm www.emea.lambda.tdk.com/dbm 24V 20A Buffer (Hold-Up) DIN Rail Module The DBM20 20A buffer module is ideal for providing short term hold-up or peak power for loads powered by a 24Vdc output AC-DC power supply. During normal operation, energy is stored in the DBM20’s electrolytic capacitors. When the AC power is interrupted for a short period of time, the DBM20 continues to power the load, allowing equipment to shutdown in a safe and controlled manner. The DBM20 can be set to fixed or variable buffer mode. In fixed mode it will provide power when the input voltage drops to 22.4V, in variable mode when the input decreases by 1V. Multiple buffer modules can be paralleled for additional hold-up time. Product status can be accessed remotely via a DC OK relay, or locally using the LED indicators. The output voltage can also be inhibited to avoid an unsafe discharge of the stored energy. • Provides 250ms Additional Hold-Up Time at 448W • Avoids Loss of Data During AC Power Interruptions • Utilizes Electrolytic Capacitors to Store Energy • No Batteries to Service or Maintain • Increases Available Space on the DIN Rail • Parallel Capable • Hold-Up Time Can Be Extended • Output Remote On/Off Function • Avoids Unsafe Discharge of Stored Energy Model Selector Output Voltage Output Voltage Maximum Average Buffer Model Fixed Mode (V) (1) Dynamic Mode (V) (1) Current (A) Power (W) Terminals BM20 22.4 D Vin-1 20 448 Screw DBM20/E 22.4 Vin-1 20 448 Spring Clamp Related Products Type Redundancy module Low power DIN rail power supplies Mid to high power DIN rail power supplies Mid to high power premium DIN rail power supplies DIN rail mount filters DIN rail mount filters RSEV DIN rail mounting kit Description 20 to 40A DIN Rail Redundancy Module 15 to 100W AC-DC DIN rail power supplies 120 to 480W AC-DC DIN rail power supplies 120 to 960W AC-DC DIN rail power supplies 3A to 30A 250Vac 2 stage filters with pulse attenuation 6A to 30A 250Vac 2 stage filters RSEV DIN rail mounting kit Specifications Model Input Input Voltage range Input Voltage Maximum Limit Input Current (Typical) Charging Time (Typical) Hold Up Time (Typical) Conducted & Radiated EMI Immunity Safety Agency Certifications DBM20 Fixed Mode: 23 - 30, VIN-1 Mode: 24 - 30 35 Charging Mode: 0.8, Ready Mode: 0.2 40 250 EN55032-B CISPR32-B See immunity table IEC/UL/CSA/EN62368-1, UL508, CE Mark (LVD, EMC and RoH

ESD Radiated Susceptibility Electrical Fast Transient Burst Surge Conducted Susceptibility Test Level Notes 16kV air, 8kV contact - Signal pin to FG Lvl 1 Common mode only Lvl 2, Signal pin to FG Lvl 1 - Specifications Model Output Buffer Voltage Tolerance (Load > 5%) % Fixed Mode: 0.2, Dynamic Mode: +3 to -4 Switching Frequency (Typical) kHz Buck Converter: 100, Boost Converter: 70 Ripple & Noise mV <240 Minimum Load - No minimum load required Overcurrent Protection % >105 of buffer current Input Overvoltage Protection V 35 Overtemperature Protection - No Remote On/Off - Yes DC OK Relay -...

Buffer Time Versus Buffer Current

Block Diagram Timing Diagram

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