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TPS40021PWPR датащи(PDF) 2 Page - Texas Instruments |
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TPS40021PWPR датащи(HTML) 2 Page - Texas Instruments |
2 / 32 page TPS40020 TPS40021 SLUS535C − MARCH 2003 − REVISED SEPTEMBER 2004 www.ti.com 2 DESCRIPTION (CONTINUED) The short circuit current detection is programmable through a single resistor, allowing the short circuit current limit detection threshold to be easily tailored to accommodate different size (RDS(on)) MOSFETs. The short circuit current function provides pulse-by-pulse current limiting during soft-start and short term transient conditions as well as a fault counter to handle longer duration short circuit current conditions. If a fault is detected the controller shuts down for a period of time determined by six (6) consecutive soft-start cycles. The controller automatically retries the output every seventh (7th) soft-start cycle. In addition to determining the off time during a fault condition, the soft-start ramp provides a closed loop controlled ramp of the converter output during startup. Programmability allows the ramp rate to be adjusted for a wide variety of output L-C component values. The output voltage transient comparators provide a quick response , first strike, approach to output voltage transients. The output voltage is sensed through a resistor divider at the OSNS pin. If an overvoltage condition is detected the HDRV gate drive is shut-off and the LDRV gate drive is turned on until the output is returned to regulation. Similarly, if an output undervoltage condition is sensed the HDRV gate drive goes to 95% duty cycle to pump the output back up quickly. In either case, the PowerGood open drain output pulls low to indicate an output voltage out of regulation condition. The PowerGood output can be daisy-chained to the SS/SD pin or enable pin of other controllers or converters for output voltage sequencing. The transient comparators can be disabled by simply tying the OSNS pin to VDD. The TPS4002x can be externally synchronized through the ILIM/SYNC pin up to 1.5 × the free-running frequency. This allows multiple contollers to be synchronized to eliminate EMI concerns due to input beat frequencies between controllers. INTERNAL BLOCK DIAGRAM UDG−02092 VDD DISABLE 2 BOOT2 13 VDD 9 ILIM/SYNC 1 PWRGD 5 SW 14 COMP 6 PVDD 12 SS/SD 8 LDRV 11 SGND UVLO VDD 3 OSNS 4 FB 7 RT 0.719 V 0.659 V + 0.69 V OSC UVLO PREDICTIVE GATE DRIVE(tm) PWM LOGIC CLK CHARGE PUMP BOOT1 16 HDRV 15 PWM ACTIVE DRV VDD UVLO FAULT COUNTER SOFT START FAULT SS ACTIVE DCHG CLK − + OC 0.28 V UVLO ISS SD VDD UVLO 1 V VDD SYNC DRV PVDD PGND 10 CURRENT LIMIT COMPARATOR + 1.4 V + IRT IRT SS |
Аналогичный номер детали - TPS40021PWPR |
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Аналогичное описание - TPS40021PWPR |
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