The DC965A is a single output high frequency step-down DC/DC converter based on the LTC3835 with low quiescent current. It can operate with low dropout voltage when the input voltage is close to the output voltage. The circuit board supports battery powered applications, with selectable burst mode operation to reduce the IC supply current at light loads to extend battery life. The phase-lockable frequency allows the LTC3835 to be synchronized by an external signal. The output voltage of the LTC3835 can track an external ramp voltage signal during power-up and power-down. Also, the built-in current foldback prevents the overheating of output MOSFETs during short-circuit. All these features make the circuit a high performance solution for applications in automotive and battery- operated systems, telecom and distributed DC power systems.
This guide explains how to set up and test the DC965A demonstration circuit, which generates a regulated 3.3V output from 4.5V to 36V input. It includes jumper settings, power connection steps, and measurement procedures for voltage, ripple, and efficiency. The circuit is designed for automotive and battery-operated systems.
The guide provides default jumper configurations for burst mode, continuous conduction mode, and phase-lockable frequency. It also includes tips for measuring voltage ripple and troubleshooting output issues.
| Input Voltage Range | 4.5V to 36V |
|---|---|
| Maximum Output Current | 5A |
| Output Voltage | 3.3V |
| Output Ripple | 36mVP-P |
| Nominal Switching Frequency | 400kHz |
| Efficiency | 91.5% |
The output voltage is 3.3V, with a range of 3.234V to 3.366V.
The input voltage range is 4.5V to 36V.
The nominal switching frequency is 400kHz.
Measure the output voltage ripple by touching the probe tip directly across the Vout and GND terminals.