LM2596 step-down module (150 kHz, 3 A)
Buck converter module: input 4.5–40 V, output adjustable from 1.23 V (trimmer), up to 3 A. The LM2596 switches at 150 kHz into 33 µH with a Schottky catch diode and 220 µF output capacitor, so inductor current ripple, output ripple and the efficiency (switch drop 1.16 V at 3 A, diode 0.5 V) are visible. Averaged mode replaces the switching by its cycle average: much faster, without ripple. IN− and OUT− are connected on the board.
Key data
- Category
- Modules
- Simulation model
- Behavioural mixed-signal model
- Manufacturer part number
- LM2596S-ADJ DC-DC module
- Reference prefix
- U
- Pins
- 4
- Land pattern
- PinHeader_1x04_P2.54mm_Vertical
Simulation model
A behavioural model implements the interface of the chip (registers, protocol, timing) at its pins. The pins are connected to the analog circuit like CMOS pins.
- Model
- lm2596
- Supply pins
- IN+ / IN-
Pins 4
| Pin | Name | Use |
|---|---|---|
| IN+ | IN+Supply pin | Input 4.5–40 V |
| IN- | IN−Ground pin | Input ground (= OUT−) |
| OUT+ | OUT+Supply pin | Regulated output (set with the trimmer) |
| OUT- | OUT−Ground pin | Output ground (= IN−) |
Parameters 2
voutSets R2 = 1 kΩ · (VOUT / 1.23 V − 1); needs VIN about 1.5–2 V above VOUT
modeswitching: real 150 kHz PWM with ripple; averaged: cycle average, fast, no ripple (continuous conduction)
PCB
PinHeader_1x04_P2.54mm_VerticalLM2596 step-down module (150 kHz, 3 A) as a module on a 4-pin header (IN+, IN−, OUT+, OUT−) – wire it to the pads / terminals of your module