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TPS23750PWPG4 Datasheet(PDF) 4 Page - Texas Instruments |
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TPS23750PWPG4 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 38 page www.ti.com ELECTRICAL CHARACTERISTICS DC/DC CONTROLLER SECTION TPS23750 TPS23770 SLVS590A – JULY 2005 – REVISED AUGUST 2005 Characteristics are for: –40 °C ≤ T J ≤ 125°C; VDD – VSS = 48 V. VDD, CLASS, and DET referenced to VSS, and all other pin voltages are referenced to RSN, COM, and RTN shorted together unless otherwise noted. SEN=MODE=BL=RSP=RTN, FB=VBIAS, SENP=VDD, CTMR = 1000 pF, CVBIAS = 0.1 µF, CVAUX = 0.1 µF, RFREQ = 150 kΩ, RDET = 24.9 kΩ, RCLASS = 255 Ω, GATE is unloaded, and VBIAS and AUX have no external loads unless otherwise noted. RTN = V SS for this section only. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT BIAS SUPPLY (VBIAS) VBIAS Output voltage 0 ≤ I LOAD ≤ 5 mA 4.60 5.1 5.5 V AUX SUPPLY (AUX) VAUX Supply output voltage 18 V ≤ V VDD – COM ≤ 57 V, 0 mA ≤ IAUX ≤ 10 mA 9 10 11 V Current limit VAUX = 0 V 12 23.5 28 mA OSCILLATOR (FREQ) RFREQ = 30 kΩ, VCOMP = 3.9 V, MODE = VBIAS, Measure GATE 48.8 49.2 49.5 % DMAX Maximum duty cycle voltage at 50% rising to 50% falling MODE = VBIAS, VCOMP = 3 V, Measure at GATE fOSC Oscillator frequency RFREQ = 30 kΩ 435 487 565 kHz RFREQ = 150 kΩ 90 100 110 ERROR AMPLIFIER (FB, COMP) COMP source current 0 ≤ V COMP ≤ 4 V, FB = RTN, VTMR = 2.5 V 2.5 mA COMP sink current 1.2 V ≤ V COMP ≤ VBIAS, VTMR = 2.5 V 2.4 mA VREF FB regulation voltage VCOMP = 2.5 V, VTMR = 2.5 V 1.47 1.50 1.53 V Open loop voltage gain 1.2 V ≤ V COMP ≤ 4 V, VTMR = 2.5 V 80 dB Small signal unity gain bandwidth VCOMP = 2.5 V, VTMR = 2.5 V 1.5 2 MHz COMP input resistance MODE = VBIAS, 1.1 ≤ VCOMP ≤ 4.4, VTMR = 2.5 V 70 100 130 k Ω FB leakage (source or sink) 0 ≤ V FB ≤ VBIAS, VTMR = 2.5 V 1 µA SOFT START TIMER (TMR) Source current TMR charging, VTMR between lower threshold and clamp 38 50 62 µA Ratio of source/sink current 9 10 11 - ON duty cycle MODE = VBIAS, VCOMP = 4.4 V, Second cycle and beyond 8 9.1 10 % CURRENT SENSE (RSP, RSN, BL) MODE = VBIAS, VCOMP = 4.2 V, VTMR = 2.5 V, Increase 0.46 0.5 0.54 V Current limit threshold VRSP-RSN until the duty cycle switches from 50% to the minimum MODE = VBIAS, VCOMP = 4.2 V, VTMR = 2.5 V, Increase 0.70 0.765 0.83 V Fault current threshold VRSP-RSN until no gate pulses occur VRSP – RSN = 0.6 V, VAUX = 12 V, MODE = VBIAS, VCOMP = 4.2 V, VTMR = 2.5 V. Measure 50% of VGATE↑ to 50% VGATE↓ Minimum propagation delay, BL floating 40 60 90 tBLNK Current limit delay ns Blanking period (pulse width above minimum), BL connected to 45 70 95 RSN Blanking period (pulse width above minimum), BL connected to 70 105 140 VBIAS FREQ = VBIAS, MODE = VBIAS, VCOMP = 4 V, RSP current 2.5 4 8 µA VRSP-RSN = 0.4 V, IRSP sourcing GATE DRIVER (GATE) 5 mA source, VAUX = 12 V 11.9 Output voltage swing V 5 mA sink, VAUX = 12 V 0.05 Peak source current VAUX = 12 V, pulse test 0.33 0.58 0.8 A Peak sink current VAUX = 12 V, AC test or pulse test with TMR = RSN 0.7 1.0 1.3 A VOLTAGE TRANSLATOR (SEN, SENP) VTMR = 2.5 V, Measure with servo loop that includes the error (SENP - SEN) regulation voltage 1.456 1.492 1.526 V amplifier 4 |
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