component
ncp1397bdr2g
Public Made by Adomby adom
onsemi AC-DC Controllers and Regulators, SOIC-16. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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README
markdownNCP1397BDR2G
onsemi · AC-DC Controllers and Regulators · SOIC-16
NCP1397BDR2G from onsemi, in a SOIC-16. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CSS(dis) | passive | Soft-start capacitor discharge pin. Connect to the external soft-start capacitor to reset (discharge) it before startup or during overload conditions so the next startup ramp begins from zero. |
| 2 | Fmax | passive | Maximum frequency clamp. A resistor to this pin sets the upper frequency excursion of the VCO (VCO range up to 500 kHz). |
| 3 | Ctimer | passive | Fault timer duration. An external capacitor to GND sets the duration the controller tolerates a fault at the Fault pin before shutting down. |
| 4 | Rt | passive | Minimum frequency clamp. A resistor to this pin sets the minimum oscillator frequency reached when VFB = 1 V (lower limit of the VCO sweep, typically ≥50 kHz). |
| 5 | BO | input | Brown-out detection input. Senses a scaled image of the bulk voltage; when the pin is driven above Vlatch (~4 V) the controller fully latches off, providing brown-out and PFC-association protection. |
| 6 | FB | input | Feedback input. Injecting current (typically from an optocoupler in common-collector configuration) into this pin increases the oscillation frequency up to Fmax, providing loop regulation. |
| 7 | DT | passive | Deadtime adjustment. A single resistor to GND sets the half-bridge dead-time between high-side and low-side conduction, adjustable from ~100 ns to 2 µs to prevent shoot-through. |
| 8 | Skip/Disable | input | Skip or Disable input. Pulling low enters skip/disable; upon release a clean soft-start sequence occurs if VFB < 0.3 V, otherwise the IC restarts without soft-start (skip-cycle mode). |
| 9 | Fault | input | Fault detection input. When asserted above the first threshold the external timer (Ctimer) starts counting down and shuts down the controller; the soft-start discharge switch is simultaneously activated so operating frequency rises to protect the power stage. A second higher threshold (~1.5 V) latches the IC off permanently on the 'B' variant (NCP1397B). |
| 10 | GND | power_in | Analog ground reference for the controller and low-side driver return. |
| 11 | Mlower | output | Low-side gate driver output. Drives the gate of the lower half-bridge MOSFET, referenced to GND, with 1 A sink / 0.5 A source peak capability. |
| 12 | VCC | power_in | Controller supply pin. Accepts up to 20 V; typical startup current is 300 µA. Decouple with a local ceramic capacitor to GND. |
| 13 | NC | unconnected | Pin 13 is omitted from the package (SO-16 'Less Pin 13'). Its absence increases the creepage distance between the low-voltage (VCC, pin 12) and high-voltage floating (HB, pin 14) sections. |
| 14 | HB | passive | Half-bridge switching node connection. Return/reference for the high-side driver and bootstrap capacitor; connects to the source of the upper MOSFET / drain of the lower MOSFET (switching node up to 600 V). |
| 15 | Mupper | output | High-side gate driver output. Drives the gate of the upper half-bridge MOSFET, floating between HB and Vboot; 1 A sink / 0.5 A source peak capability. |
| 16 | Vboot | power_in | Bootstrap supply pin for the high-side floating driver. Connect a bootstrap capacitor between Vboot and HB (charged from VCC via an external bootstrap diode) to supply the upper gate driver. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | onsemi |
| Package | SOIC-16 |
| Category | PMIC |
| Pins | 16 |
Ordering variants
NCP1397BDR2GADR2GNCP1397BDR2G
CAD (KiCad official)
- Symbol:
NCP1397BDR2G - Footprint:
Package_SO:SOIC-16_3.9x9.9mm_P1.27mm - 3D model: SOIC-16 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: onsemi datasheet (None pp, sha256
cee5e90dc431cbdf, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).
Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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