Teardown: Delta DPS-1600AB-37 A 1600W Server PSU — TI UCD3138A Digital PFC Controller
2026-09-16 · Compiled by Best IT Parts from public industry reporting
A teardown of the Delta DPS-1600AB-37 A server power supply shows Texas Instruments' UCD3138A digital power controller handling front-end PFC control. The 1600W-class unit accepts 100-120V and 200-240V AC input plus 240V DC input; maximum output is 1000W on low-line AC and 1600W on 200-240V AC or 240V DC, with the main rail rated 12V/132A alongside a standby output.
Internally the supply uses a PFC plus half-bridge LLC plus synchronous rectification architecture. The PFC stage performs power-factor correction and establishes the high-voltage bus, the LLC stage provides isolated conversion, and synchronous rectification produces the low-voltage, high-current output that feeds the server. Rather than serving only peripheral monitoring and communications, the UCD3138A closes the control loop on the PFC power stage itself, taking feedback samples and running compensation and PWM generation in the digital domain across wide input-voltage and load conditions.
The UCD3138A integrates a 32-bit ARM7TDMI-S core with program and data memory plus RAM, allowing different power topologies and control strategies to be implemented in firmware. It carries three independent digital feedback loops, each with a high-speed error ADC, digital compensator and digital PWM module, and can provide up to eight high-resolution DPWM outputs with 250ps pulse-width resolution and switching frequencies up to 2MHz. Voltage mode, average current mode and peak current mode are supported, together with PWM, phase-shift and variable-frequency modulation for PFC, phase-shifted full bridge and LLC topologies. Interface and protection features include PMBus and UART, a high-speed comparator, cycle-by-cycle current limiting and programmable fault protection.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.