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JW1551QFNAH#TRPBF
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JoulWatt Tech JW1551QFNAH TRPBF AC-DC Controllers and Regulators, QFN-20(4x4). Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownJW1551QFNAH#TRPBF
JoulWatt Tech · AC-DC Controllers and Regulators · QFN-20(4x4)
JW1551QFNAH#TRPBF from JoulWatt Tech, in a QFN-20(4x4). 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 | COMP | output | Compensation pin for the feedback loop. Internally pulled up to ~3V through ~11.5kΩ; drives burst mode thresholds (~345mV/390mV) and over-load set point (~3V). |
| 2 | NC | unconnected | No connect. |
| 3 | NC | unconnected | No connect. |
| 4 | HV | power_in | High voltage startup pin. Draws current from the bulk rail to charge VCC at startup and drives the X-cap discharge function. Absolute max -0.3 to 600V; recommended 0V to 500V. |
| 5 | NC | unconnected | No connect. |
| 6 | NC | unconnected | No connect. |
| 7 | GND | power_in | Power ground return for the controller. |
| 8 | RFM | input | Maximum switching frequency set pin. External resistor programs fMAX per fMAX = 25 + 5×10^4 / RFM(kΩ) kHz (e.g. 475kHz typical at RFM=105kΩ). |
| 9 | RT | input | Resonant time set pin. External resistor programs the resonant/dead-time interval for the active clamp switching. |
| 10 | OTP | input | Over-temperature protection pin. Connects to an external NTC; internal ~105µA pull-up, shutdown when V<~1V, recovery at ~2.25V. |
| 11 | CS | input | Current sense input from the source of the primary switch. Used for peak current control, SCP, and CS UVP (~245mV threshold). Max current set point ~600mV, short-circuit protection at ~1V. |
| 12 | GON | output | Gate/enable output for the main primary switch (driven high ~5.25V, low ~30mV). Delay from EN high to GON high ~39.5µs. |
| 13 | GAC | output | Gate/enable output for the active clamp switch (driven high ~5.25V, low ~30mV). Fires ~80ns after GON goes low. |
| 14 | EN | input | Enable pin used to disable the IC. Absolute max -0.3 to 5.5V. |
| 15 | VDD | power_out | Internal 13V LDO regulator output. Bypass with a decoupling capacitor to GND. |
| 16 | VS | input | Voltage sense input pin. Monitors auxiliary/secondary winding voltage for SW/ZVS detection, brown-in/out (~467µA/~400µA), and VS OVP/UVP (~800µA/~66.6µA). |
| 17 | VCC | power_in | Controller supply pin. Turn-on ~14.8V, turn-off ~10.6V; absolute max -0.3 to 45V. Powered by internal HV startup and by auxiliary winding/boost in run. |
| 18 | BST | output | Boost switching node for the internal boost converter that supplies VCC. Boost frequency ~1.6MHz. Absolute max -0.3 to 45V. |
| 19 | GND | power_in | Power ground return for the controller. |
| 20 | VIN | power_in | Power supply input for the internal boost converter. Range 2.5V to 38V; UVP ~2V, OVP ~40.5V. |
| EP | GND | power_in | Exposed thermal pad on the bottom of the QFN. Connect to GND plane for electrical ground return and thermal dissipation. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | JoulWatt Tech |
| Package | QFN-20(4x4) |
| Category | PMIC |
| Pins | 21 |
Ordering variants
Same part, different packaging or reel option.
JW1551QFNAH#TRPBF
CAD (KiCad official)
- Symbol:
JW1551QFNAH#TRPBF - Footprint:
Package_DFN_QFN:QFN-20-1EP_4x4mm_P0.5mm_EP2.5x2.5mm - 3D model: QFN-20(4x4) (KiCad packages3D, STEP)
- 3D model files:
jw1551qfnah-trpbf-etched.step/jw1551qfnah-trpbf-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);jw1551qfnah-trpbf.step/jw1551qfnah-trpbf.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: JoulWatt Tech datasheet (13 pp, sha256
6762b812efd5cb58, retrieved 2026-08-17, tier: lcsc) - 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).