# Modest Purple Replicator ## Description System Architecture Overview with PWM Interface, Power Stage, Protections, EMI Filters, Connectors, Hall-Effect Current Monitoring, 4-pin JST-XH Control Header, Isolation & Default-OFF PWM Behavior, Compact Mechanical Layout #hall-sensing #isolated-control #compact-layout ## Project Details - **Owner:** chrispyduck - **Created:** 1/21/2026 - **Last Updated:** 1/21/2026 - **Visibility:** Public - **Control Header Type:** 4-pin JST-XH isolated control header (3V3_in, GND_iso, PWM_in, IMON_out) - **Current Sensing:** Hall-effect isolated current monitor with RC-filtered output and test point - **Mechanical Layout:** Compact PCB with defined board outline and mounting holes for mechanical integration - **System Architecture:** PWM interface Power stage Protections EMI filters Connectors Hall-effect sensor Control header (3V3_in, GND_iso, PWM_in, IMON_out) Mechanical elements (mounting holes, board outline) ## Key Components ### D1 — [SMF58A](https://www.flux.ai/lcsc/smf58a~9gq.md) - Part Type: TVS - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2407101127_MDD-Microdiode-Semiconductor-SMF58A_C523843.pdf - Package: SOD-123FL_L2.7-W1.8-LS3.8-RD - Manufacturer Name: MDD - Product Info Url: https://lcsc.com/product-detail/TVS_MDD-Microdiode-Electronics-SMF58A_C523843.html - Manufacturer Part Number: SMF58A - Role: Protection - JLCPCB Part Class: Extended Part - LCSC Part Number: C523843 - Role Details: Surge protection for -48 V input - Package or Case Code: SOD-123FL_L2.7-W1.8-LS3.8-RD **Pins:** - A [pin 2] - C [pin 1] ### J1 — [2-Position Screw Terminal](https://www.flux.ai/corynrobinson/2-position-screw-terminal~s4.md) - Manufacturer Name: Würth Elektrik - Part Type: Connector - Manufacturer Part Number: 691137710002 - Datasheet URL: https://www.we-online.com/katalog/datasheet/691137710002.pdf - Role Details: –48 VDC input connector - Role: –48 VDC input connector **Pins:** - P1 [pin 1] - P2 [pin 2] ### J2 — [XY301V-A-5.0-2P](https://www.flux.ai/jharwinbarrozo/xy301v-a-50-2p~u6.md) - Role: Atomizer output connector - Manufacturer Name: Ningbo Xinlaiya Elec. - Manufacturer Part Number: XY301V-A-5.0-2P - Role Details: Atomizer output connector **Pins:** - PIN1 [pin 1] - PIN2 [pin 2] ### J3 — [B4B-XH-A(LF)(SN)](https://www.flux.ai/adrian95/b4b-xh-alfsn~8ne.md) - Part Type: Connector - Manufacturer Part Number: B4B-XH-A(LF)(SN) - Package: Through Hole - Role: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/eXH.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Isolated control header for signals 3V3_in, GND_iso, PWM_in, IMON_out - Manufacturer Name: JST Sales America Inc. **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J4 — [PAD WITH HOLE 4mmx1.5mm](https://www.flux.ai/adrian95/pad-with-hole-4mmx15mm~wdx.md) **Pins:** - P1 ### J6 — [PAD WITH HOLE 4mmx1.5mm](https://www.flux.ai/adrian95/pad-with-hole-4mmx15mm~wdx.md) **Pins:** - P1 ### J7 — [PAD WITH HOLE 4mmx1.5mm](https://www.flux.ai/adrian95/pad-with-hole-4mmx15mm~wdx.md) **Pins:** - P1 ### MountTR — [PAD WITH HOLE 4mmx1.5mm](https://www.flux.ai/adrian95/pad-with-hole-4mmx15mm~wdx.md) **Pins:** - P1 ### Q1 — [CSD19537Q3 - 4386107](https://www.flux.ai/kicad-part-library/csd19537q3-4386107~qdq.md) - Manufacturer Part Number: CSD19537Q3 - Role: Switching - Package or Case Code: VSON-8_3.3x3.3mm_P0.65mm_NexFET - Part Type: Transistor - Manufacturer Name: Texas Instruments Inc. - Role Details: High-side MOSFET for synchronous buck - Datasheet URL: http://www.ti.com/lit/ds/symlink/csd19537q3.pdf - Package: VSON8 - Transistor Type: MOSFET - Drain to Source Voltage: 100V **Pins:** - D [pin 5] - G [pin 4] - S [pin 2] - S [pin 3] - S [pin 1] ### Q2 — [CSD19537Q3 - 4386107](https://www.flux.ai/kicad-part-library/csd19537q3-4386107~qdq.md) - Transistor Type: MOSFET - Datasheet URL: http://www.ti.com/lit/ds/symlink/csd19537q3.pdf - Role Details: Low-side MOSFET for synchronous buck - Manufacturer Part Number: CSD19537Q3 - Package: VSON8 - Part Type: Transistor - Package or Case Code: VSON-8_3.3x3.3mm_P0.65mm_NexFET - Role: Switching - Drain to Source Voltage: 100V - Manufacturer Name: Texas Instruments Inc. **Pins:** - D [pin 5] - G [pin 4] - S [pin 2] - S [pin 3] - S [pin 1] ### U1 — [LM5116MH/NOPB](https://www.flux.ai/adrian95/lm5116mhnopb~q40.md) - Part Type: Integrated Circuit - Integrated Gate Drivers: Yes - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LM5116MH/NOPB - Manufacturer Name: Texas Instruments - Role: Power Conversion - Role Details: High-voltage synchronous buck controller for -48 V to adjustable output - Datasheet URL: https://www.ti.com/lit/ds/symlink/lm5116.pdf - Max Input Voltage: 100V - Integrated Circuit Type: Power Management **Pins:** - AGND [pin 6] - COMP [pin 9] - CS [pin 12] - CSG [pin 13] - DEMB [pin 11] - EN [pin 4] - EP [pin 21] - FB [pin 8] - HB [pin 18] - HO [pin 19] - LO [pin 15] - PGND [pin 14] - RAMP [pin 5] - RT/SYNC [pin 3] - SS [pin 7] - SW [pin 20] - UVLO [pin 2] - VCC [pin 16] - VCCX [pin 17] - VIN [pin 1] - VOUT [pin 10] ### U2 — [ACPL-C799T-500E](https://www.flux.ai/lcsc/acpl-c799t-500e~acsj.md) - Manufacturer Name: AVAGO(安华高) - Manufacturer Part Number: ACPL-C799T-500E - Role Details: Digital optocoupler for isolated PWM input to analog control signal - Package or Case Code: SO-8_L5.9-W6.8-P1.27-LS11.5-BL - LCSC Part Number: C1849365 - Role: Isolation **Pins:** - GND1 [pin 4] - GND2 [pin 5] - MCLK [pin 7] - MDAT [pin 6] - VDD1 [pin 1] - VDD2 [pin 8] - VIN- [pin 3] - VIN+ [pin 2] ### U3 — [TPS3823-33QDBVRQ1](https://www.flux.ai/lcsc/tps3823-33qdbvrq1~upsn.md) - Package or Case Code: SOT-23-5_L2.9-W1.6-P0.95-LS2.8-BR - Manufacturer Name: TI(德州仪器) - Role: Protection - Manufacturer Part Number: TPS3823-33QDBVRQ1 - Role Details: Undervoltage lockout and watchdog timer for system safety - Integrated Circuit Type: Power Management - Max Input Voltage: 6.5V - Part Type: Integrated Circuit - JLCPCB Part Class: Extended Part - LCSC Part Number: C180100 **Pins:** - ~{MR} [pin 3] - ~{RESET} [pin 1] - GND [pin 2] - VDD [pin 5] - WDI [pin 4] ### U4 — [LTC4359CDCB#TRMPBF](https://www.flux.ai/lcsc/ltc4359cdcbtrmpbf~h73k.md) - Part Type: Integrated Circuit - LCSC Part Number: C580866 - Package or Case Code: DFN-6_L3.0-W2.0-P0.50-BL-EP - Manufacturer Name: ADI(亚德诺) - Integrated Circuit Type: Power Management - Role Details: Ideal diode controller for reverse polarity protection on -48 V input - JLCPCB Part Class: Extended Part - Max Input Voltage: 80V - Role: Reverse Polarity Protection - Manufacturer Part Number: LTC4359CDCB#TRMPBF **Pins:** - ~{SHDN} [pin 5] - EP [pin 7] - GATE [pin 2] - IN [pin 4] - OUT [pin 1] - SOURCE [pin 3] - VSS [pin 6] ### U5 — [ACS724LLCTR-10AU-T](https://www.flux.ai/vasy_skral/acs724llctr-10au-t~nju.md) - Datasheet URL: https://www.allegromicro.com/~/media/Files/Datasheets/ACS724-Datasheet.ashx - Manufacturer Part Number: ACS724LLCTR-10AU-T - Role: Sensing (Shunt) - Manufacturer Name: Allegro MicroSystems - Part Type: Sensor - Role Details: Series current sensor for atomizer output (0–10 A) **Pins:** - FILTER [pin 6] - GND [pin 5] - IP- [pin 3] - IP- [pin 4] - IP+ [pin 1] - IP+ [pin 2] - VCC [pin 8] - VIOUT [pin 7] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/chrispyduck/modest-purple-replicator~7l](https://www.flux.ai/chrispyduck/modest-purple-replicator~7l).* --- *Generated from [https://www.flux.ai/chrispyduck/modest-purple-replicator~7l](https://www.flux.ai/chrispyduck/modest-purple-replicator~7l)*