1. General Description & Purpose:

️· The document is a datasheet for the DNS family of DC-DC converter modules.
️· These modules are designed for applications requiring regulated power with features like voltage tracking, margining, and protection.
️· Key features include: Voltage tracking (sequential start-up, simultaneous, ratio-metric), voltage margining, remote sense, output voltage programming, and multiple protection mechanisms.

2. Key Features & Functions:

️· Voltage Tracking:
- Sequential Start-Up: One module turns on after the other, controlled by the previous module's output voltage.
- Simultaneous: Modules start up together, aiming to minimize voltage difference.
- Ratio-Metric: Modules track each other in a defined ratio.
- Requires the TRACK pin and potentially external control circuitry.
️· Voltage Margining: Allows for adjustment of the output voltage above and below the nominal value (useful for testing and design margins). Requires resistors (Rmargin-up, Rmargin-down) connected to the TRIM pin.
️· Remote Sense: Compensates for voltage drop along distribution lines to maintain regulation at the load.
️· Output Voltage Programming: The output voltage can be adjusted using either:
- An external resistor (Rtrim) connected to the TRIM and GND pins.
- An external voltage source applied to the TRIM pin.
- Datasheet provides calculation formulas and tables for resistor values and voltage levels.
️· Protection Features:
- Over-Temperature Protection: Shuts down the module if the temperature exceeds a threshold and attempts to restart.
- Over-Current Protection: Enters a hiccup mode.
️· Other features: Remote on/off control, Input undervoltage lockout.

3. Programming & Configuration Details:

️· Output Voltage Programming Formulas: Provided for both resistor-based (Rtrim) and voltage-based (Vtrim) methods.
️· Tables of Resistor Values: Provided for common output voltages (0.7525V, 1.2V, 5V, 1.8V, 2.5V, 3.3V).
️· Voltage Margining: Calculation tool available for determining Rmargin-up and Rmargin-down resistor values.
️· Sequential Start-up: Requires external On/Off control circuit connecting Vo PS1 to the On/Off pin of PS2.
️· Simultaneous Start-up Connect Vo PS1 to TRACK pin of PS2.
️· Ratio-metric Start-up Requires external circuitry and is not detailed in the document.

4. Key Calculations & Formulas

️· Rtrim Calculation: Provides a formula to calculate the resistor value for setting the desired output voltage.
️· Vtrim Calculation: Provides a formula to calculate the voltage level needed for setting the desired output voltage.
️· Margining Calculation Calculation tool available for determining Rmargin-up and Rmargin-down resistor values.
️· Power Limits: Emphasizes that the module's maximum output power (Vo x Io) must not exceed its rated power.

5. Important Considerations:

️· Input Voltage: Must be applied prior to attempting voltage tracking.
️· On/Off Status: Remote On/Off pin must be in the "on" state for voltage tracking to function.
️· Simultaneous Start-up: Requires the voltage applied to the TRACK pin to be higher than the Vo PS2 set point voltage.