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TPSM846C23MOLR Fiches technique(PDF) 8 Page - Texas Instruments |
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TPSM846C23MOLR Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 82 page 8 TPSM846C23 SLVSDF3C – MARCH 2017 – REVISED AUGUST 2017 www.ti.com Product Folder Links: TPSM846C23 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated (1) Specified by design. (2) Functionality Verified. Limits guaranteed at internal IC test. 6.7 Switching Characteristics Over –40°C to 105°C free-air temperature range, VIN = 12 V, VOUT = 1.2 V, IOUT = IOUT max, ƒSW = 500 kHz, CIN1 = 4 × 22-µF, 25-V, 1210 ceramic; CIN2 = 2 × 330-µF, 25-V, electrolytic bulk; COUT1 = 4 × 47-µF, 6.3-V, 1210 ceramic; COUT2 = 2 × 470-µF, 6.3-V, polymer bulk (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OSCILLATOR ƒSW Switching frequency Factory default setting. RRT = open; RT_SEL grounded 425 500 575 kHz RRT = 68.1 kΩ, 1%; RT_SEL open 255 300 345 RRT = 20.0 kΩ, 1%; RT_SEL open 850 1000 1150 Adjustment range 250 1200 PWM tON-MIN Minimum on time(1) 50 100 ns tOFF-MIN Minimum off time(1) ƒSW = 1 MHz 515 560 ns SYNCHRONIZATION VIH(sync) High-level input voltage(2) 2.2 V VIL(sync) Low-level input voltage(2) 0.8 V DSYNC Sync input duty cycle ƒSW = 250 kHz to 1.2 MHz 50% ƒSYNC Sync frequency range 250 1200 kHz (1) Functionality Verified. Limits guaranteed at internal IC test. (2) Setting TON_RISE or TOFF_FALL to 0 ms programs the device to bring its output voltage up to the programmed regulation value or down to 0 V as quickly as possible, resulting in an effective TON_RISE and TOFF_FALL time of 1 ms. (3) Setting TON_MAX_FAULT_LIMIT to 0 disables the TON_MAX_FAULT response. 6.8 Programmable Characteristics Over operating free-air temperature range, VIN = 12 V, ƒSW = 500 kHz (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SOFT START (PMBus Programmable) TON_RISE Soft-start time Factory default setting 3 ms Programmable range, 16 discrete settings(1) (2) 0 100 ms Accuracy, TON_RISE = 3 ms (1) –10% 10% TON_MAX_ FAULT_LIMIT Upper limit in time to power up the output Factory default setting(3) 0 ms Programmable range, 16 discrete settings(1) (3) 0 100 ms Accuracy(1) –10% 10% TON_DELAY Turn-on delay Factory default setting 0 ms Programmable range, 16 discrete settings (1) 0 100 ms Accuracy(1) –10% 10% SOFT STOP (PMBus Programmable) TOFF_FALL Soft-start time Factory default setting 3 ms Programmable range, 16 discrete settings (1) (2) 0 100 ms Accuracy, TOFF_FALL= 1 ms(1) –10% 10% TOFF_DELAY Turn-on delay Factory default setting(2) 0 ms Programmable range, 16 discrete settings(1) 0 100 ms Accuracy(1) –10% 10% UNDERVOLTAGE LOCKOUT (UVLO) (PMBus Programmable) VIN_ON Input turn on voltage Factory default setting 4.5 V Programmable range, 15 discrete settings (1) 4.25 7.75 V Accuracy(1) –5% 5% |
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