OngoingLTC6992 Pulse Generator
PROLTC6992 Pulse Generator
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Creation time:2026-01-24 11:30:47Update time:2026-02-14 11:53:51
Description
This is my first project. I would appreciate any comments on errors or possible improvements.
LTC6992 Pulse Generator
Frequency: 6Hz–1MHz (jumper-selectable)
Range 1: 6–61Hz
Range 2: 23–244Hz
Range 3: 89–976Hz
Range 4: 355Hz–3.9kHz
Range 5: 1.4–15.6kHz
Range 6: 5.7–62.5kHz
Range 7: 22.7–250kHz
Range 8: 90.9kHz–1MHz
Duty cycle: 0–100%
Input voltage: 4–100V DC (jumper-selectable)
Low range: 4–6V (buck bypassed)
High range: 6–100V (buck enabled)
Maximum input current: 20A
Jumpers (additionally required):
XFCN F254D-04-PT-B 1pc
Adam Tech MSE-G 1pc
Project Introduction
Some pulse generators are already available on the market, but their frequency ranges are usually under 150kHz, and their waveforms have rounded edges at high frequencies. Their input voltage is also typically low (under 30V).
This design has the following features:
Pulse frequency from 6Hz to 1MHz
Sharp pulse waveforms at high frequencies
Continuous duty-cycle adjustment from 0% to 100%
Input voltage from 4V to 100V
High efficiency
Design Ideas
The LM5164 is an efficient buck converter that supports a wide input voltage range from 6V to 100V. The output voltage for the control circuit is 5V. A pin header enables bypassing the buck converter at input voltages from 4V to 6V.
This low-side switching design uses the LTC6992-1 (PWM), which can generate frequencies up to 1MHz. The LTC6992-1, LM5134 (gate driver), BSC096N10LS5 (main MOSFET), and IRLML2030TRPbF (pilot MOSFET) all feature short rise and fall times, producing sharp pulse waveforms at high frequencies. These components can also operate at low input voltages from 4V to 6V.
A 0Ω jumper resistor is used as the gate resistor to allow future modifications.
This design uses a jumper-selectable network of chip resistors to cover all LTC6992-1 frequency ranges. The frequency within each range can be fine-tuned by a fixed 50kΩ resistor in series with a 500kΩ multiturn potentiometer.
A fixed 150kΩ resistor in series with a 50kΩ multiturn potentiometer provides continuous duty-cycle adjustment from 0% to 100% at any permitted input voltage.
To handle high current, this design uses a multilayer PCB in which each layer has power, ground, and switching node areas.
The frequency and input voltage ranges are printed next to the pin headers to ensure easy operation and prevent connection errors.
For high efficiency and a compact size (50mm×50mm), this design does not include a display. A measuring instrument (e.g., an oscilloscope) is required to measure the frequency and duty cycle.
Design Drawing
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