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STCMB1TR

Public Made by Adom

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STMicroelectronics AC-DC Controllers & Regulators, SOIC-20-300mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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STCMB1TR

STMicroelectronics · AC-DC Controllers & Regulators · SOIC-20-300mil

STCMB1TR from STMicroelectronics, in a SOIC-20-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 HV input 800 V-rated high-voltage start-up generator and ac sensing input, connected to the ac side of the bridge via two diodes and a mandatory 3 k to 9 k series resistor; it also supplies X-capacitor discharge.
2 N.C. unconnected Not internally connected; high-voltage spacer for creepage distance.
3 FB input PFC output voltage feedback with 2.5 V reference, 7% overvoltage stop, latch-off below 0.5 V, HB enabled above 2.4 V and inhibited below 1.75 V (dc brown-out).
4 COMP output PFC error amplifier output; the PFC gate driver is inhibited (burst mode) when the voltage falls below 1 V (typ.).
5 TON passive Sets PFC MOSFET maximum on-time via a parallel resistor and capacitor to ground, generating a ramp compared with COMP.
6 ZCD input Boost inductor demagnetization sensing input; a negative-going edge triggers PFC MOSFET turn-on (absolute maximum 3 mA).
7 CF passive Timing capacitor for the HB oscillator, connected to GND and charged by the current set at RFMIN.
8 CSS passive HB soft-start capacitor to GND with resistor to RFMIN; burst mode and second-level OCP are inhibited while below 0.3 V.
9 RFMIN output Accurate 2 V reference; resistor to GND sets the maximum timeshift and optocoupler phototransistor sets the minimum (max source current 2 mA).
10 STBY input HB burst mode threshold input with 1.25 V reference and 40 mV restart hysteresis; requires RC filter with R > 100 ohm and C > 100 pF; tie to RFMIN if unused.
11 ISEN_PFC input PFC inductor current sense input with -25 mV PWM start threshold and -0.5 V overcurrent threshold; requires RC filter with R > 100 ohm and C > 100 pF.
12 ISEN_HB input HB resonant current sense input with 0.8 V soft-start discharge threshold and 1.5 V immediate shutdown threshold; RC filter R > 50 ohm, C > 100 pF recommended; do not short to ground.
13 GND power_in Ground return for signal circuits, the PFC gate driver and the HB low-side gate driver.
14 GD_PFC output PFC gate driver totem pole output with 0.6 A source and 0.8 A sink minimum, actively pulled to GND during UVLO.
15 VCC power_in Signal part supply, operating range 10 to 20 V, requiring at least 22 uF electrolytic capacitor to GND (absolute maximum 21 V).
16 LVG output HB low-side gate drive output with 0.3 A source and 0.8 A sink minimum, actively pulled to GND during UVLO.
17 N.C. unconnected Not internally connected; high-voltage spacer for creepage distance.
18 OUT passive High-side gate drive floating ground and current return for the high-side gate drive current.
19 HVG output HB high-side gate drive output with 0.3 A source and 0.8 A sink minimum, with internal resistor to OUT during UVLO.
20 BOOT power_in High-side gate drive floating supply, bootstrap capacitor to OUT fed by internal synchronous bootstrap diode (absolute maximum 620 V).

Key specifications

Parameter Value
Manufacturer STMicroelectronics
Package SOIC-20-300mil
Category Power Supply Chip
Pins 20

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Operating range VCC VVCC 10 20 V After turn-on 11
Turn-on threshold VVCCOn 15.5 16.5 17.5 V Voltage rising 11
Turn-off threshold VVCCOff 9 9.5 10 V Voltage falling 11
Quiescent current after turn-on Iq 1.5 2.2 mA VFB = 1 V 11
Quiescent current after turn-on Iq 3 4 mA VFB = 2.5 V 11
Idle quiescent current during burst mode Iq 0.7 0.94 mA Tj = 25 °C 11
Quiescent current IC latched off Iq 1.2 mA IC latched off 11
Operating supply current ICC 2.8 3.6 mA fsw = 75 kHz, VFB = 1 V, GD_PFC only 11
Operating supply current ICC 4.5 6 mA fsw = 75 kHz, VFB = 2.5 V, all drivers 11
HV breakdown voltage VHV 800 V IHV < 100 µA 11
HV start voltage (rising) VHVstart 10 18 25 V IVCC < 100 µA 11
VCC switchover threshold VVCC_SO 1 1.5 2 V 11
HV ON-state charge current IHV, ON 0.5 1 1.6 mA VHV > VHVstart, VVCC < VVCC_SO 11
HV ON-state charge current IHV, ON 5 8 11 mA VHV > VHVstart, VVCC > VVCC_SO 11
HV ON-state charge current IHV, ON 3.5 4.5 5.5 mA IC latched off or restart after overload timeout 11
HV off-state leakage current IHV, OFF 20 24 µA VHV = 400 V 11
Generator shutdown timeout TTOUT 64 80 96 ms After VVCC exceeds VVCCOn 11
X-cap peak residual voltage VHVmin 45 V IHV, DIS > 4.2 mA 11
X-cap discharge current IHV, DIS 4.2 mA VHV > 45 V 11
Brown-out threshold VHVpk_BO 92 98 104 V Peak voltage falling; LLC in continuous switching, no burst mode, RHV series = 5.6 K 12
Brown-in threshold VHVpk_BI 106 113 120 V Peak voltage rising; LLC in continuous switching, no burst mode, RHV series = 5.6 K 12
Brown-out debounce time TDB 32 40 48 ms 12
ZCD upper clamp voltage VZCDH 2.8 3.3 V IZCD = 2.5 mA 12
ZCD lower clamp voltage VZCDL -0.3 0 V IZCD = -2.5 mA 12
ZCD input bias current IZCDb 5 µA VZCD = 1 to 2.2 V 12
TON charge current ITON 180 200 220 µA VTON = 3 V, VHV_pk = 160 V dc 12
TON charge current ITON 640 800 960 µA VTON = 3 V, VHV_pk = 320 V dc 12
TON linear operating range VTON 0 3 V 12
TON discharge resistance RDSC 60 200 Ω 12
Internal voltage reference Vref 2.475 2.5 2.525 V Tj = 25 °C 12
Internal voltage reference Vref 2.44 2.58 V 10 V < VVCC < 21 V 12
Error amp input bias current IFB -1 -0.2 1 µA VFB = 0 to 3 V 12
COMP upper clamp voltage VCOMPSAT 4 4.3 V ISOURCE = 20 µA 12
Max. sink/source current ICOMP 150 200 µA VCOMP = 3 V, VFB = 2.3 V 12
Transconductance gm 160 200 240 µS VFB = Vref 12
D_OVP threshold VFB_S 2.595 2.675 2.755 V Tj = 25 °C 12
D_OVP threshold VFB_S 2.568 2.782 V 10 V < VVCC < 21 V 12
Restart voltage after D_OVP VFB_R 2.47 2.55 2.63 V 12
D_OVP debounce time TDB 40 50 65 µs 12
S_OVP threshold VCOMP_S 0.9 1 1.1 V Voltage falling 12
Restart voltage after S_OVP VCOMP_R 0.92 1.02 1.15 V Voltage rising 12
FFP disable threshold VFB_D 0.42 0.46 0.5 V Voltage falling 13
FFP debounce time TDB 40 50 65 µs 13
ISEN_PFC input bias current IISEN_PFC 4.8 µA VISEN_PFC = -0.5 V 13
PFC OCP threshold VISEN_PFC -0.54 -0.5 -0.46 V VCOMP = upper clamp 13
PFC OCP delay to output td(H-L) 220 280 ns 13
PFC start-up delay tSTART_DEL 8 10 13 µs After VISEN_PFC > VISEN_PFC_Z 13
PFC gate driver output low voltage VOL 0.4 0.7 V Isink = 100 mA 13
PFC gate driver output high voltage VOH 14.7 14.9 V Isource = 5 mA 13
PFC gate driver fall time tf 30 70 ns From 15 to 1.5 V 13
PFC gate driver rise time tr 60 110 ns From 0 to 10 V 13
HB dc brown-out enable voltage VFB_E 2.34 2.4 2.49 V Voltage rising 13
HB dc brown-out disable voltage VFB_D 1.7 1.75 1.8 V Voltage falling 13
Oscillator ramp peak VCFp 1.44 1.5 1.56 V VSTBY > 1.34 V 13
Oscillator ramp peak VCFp 1.775 1.85 1.925 V VSTBY < 1.26 V 13
RFMIN voltage reference VRFMIN 1.93 2 2.08 V 13
Output duty cycle (HVG and LVG) D 49 50 51 % VSTBY = 2 V, RRFMIN = 5.15 k 13
Time-shift TSH 8.5 9 9.5 µs RRFMIN = 22.5 k 13
Absolute maximum VCC supply voltage VVCC -0.3 21 V Pin 15 10
Absolute maximum HV pin voltage VHV -1 800 V Pin 1, referred to GND 10
Absolute maximum BOOT voltage VBOOT -1 620 V Pin 20, referred to GND 10
Thermal resistance junction to ambient Rth j-amb 90 °C/W 10
Power dissipation Ptot 0.6 W Tamb = 70 °C 10
Junction temperature operating range Tj -40 150 °C 10
Storage temperature Tstg -55 150 °C 10

CAD (KiCad official)

  • Symbol: STCMB1TR
  • Footprint: Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm
  • 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
  • 3D model files: stcmb1tr-etched.step / stcmb1tr-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); stcmb1tr.step / stcmb1tr.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: STMicroelectronics datasheet (59 pp, sha256 6782dcbd1e92b66a, retrieved 2026-10-22, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-sonnet-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF