ZHCSMJ2 March 2021 TPS92390
PRODUCTION DATA
Figure 8-2 shows the critical part of circuitry: boost components, the TPS92390 internal charge pump for gate-driver powering, and powering/grounding of TPS92390 . Schematic example is shown in Figure 8-2.
Figure 8-2 Critical Components
for Full Feature Design| REFERENCE DESIGNATOR | DESCRIPTION | NOTE |
|---|---|---|
| RISENSE | 20 mΩ, 3 W | Input current sensing resistor |
| RSD | 20 kΩ, 0.1 W | Power-line FET gate pullup resistor |
| RSENSE | 30 mΩ, 3 W | Boost current sensing resistor |
| RG | 15 Ω, 0.1 W | Gate resistor to control the rising/falling time of nMOSFET for EMC |
| RUVLO1 | 76.8 kΩ, 0.1 W | These UVLO resistor settings set the VIN_UVLO rising voltage at 3.75 V, VIN_UVLO falling voltage at 3.35 V |
| RUVLO2 | 20.5 kΩ, 0.1 W | |
| RFB3 | 0 Ω, 0.1 W | Not needed unless 100-kΩ restrictions on resistors |
| RFB2 | 100 kΩ, 0.1 W | Bottom feedback divider resistor |
| RFB1 | 910 kΩ, 0.1 W | Top feedback divider resistor |
| RBST_FSET | 3.92 kΩ, 0.1 W | Boost frequency set resistor (400 kHz) |
| RISET | 20.8 kΩ, 0.1 W | Current set resistor (150 mA per channel) |
| RPWM_FSET | 17.8 k?, 0.1 W | Output PWM frequency set resistor (4.88kHz PWM frequency to avoid audible noise) |
| RMODE | 3.92 k?, 0.1 W | Mode resistor (Phase-Shift PWM mode with 0x3B I2C address) |
| RLED_SET | 3.92 k?, 0.1 W | LED_SET resistor (4channels configuration) |
| CPUMP | 10-μF, 10-V ceramic | Charge-pump output capacitor |
| C2X | 2.2-μF, 10-V ceramic | Flying capacitor |
| CVDD | 4.7-μF + 0.1-μF, 10-V ceramic | VDD bypass capacitor |
| CIN | 1 × 33-μF, 50-V electrolytic + 1 × 10-μF, 50-V ceramic | Boost input capacitor |
| COUT | 1 × 33-μF, 50-V electrolytic + 1 × 10-μF, 50-V ceramic | Boost output capacitor |
| L1 | 22-μH saturation current 6.5 A | Boost inductor |
| D1 | 50 V, 6.5-A Schottky diode | Boost Schottky diode |
| Q1 | 60-V, 15-A nMOSFET | Boost nMOSFET |
| Q2 | 60-V, 15-A pMOSFET | Power-line FET |