Datasheet Texas Instruments TPS40074RHLRG4 — Datenblatt

TPS40074
www.ti.com SLUS617B – APRIL 2005 – REVISED OCTOBER 2006 MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER
WITH VOLTAGE FEED-FORWARD
FEATURES Operation Over 4.5-V to 28-V Input Range
Fixed-Frequency Voltage-Mode Controller
Integrated Unity Gain Amplifier for Remote
Output Sensing
Predictive Gate Driveв„ў Generation II for
Improved Efficiency 10 V Output voltage 7 8 4.0 4.3 TA = TJ = 25°C 0.698 0.700 0.704 0°C ≤ TA = TJ ≤ 85°C 0.690 0.700 0.707 -40°C ≤ TA = TJ ≤ 85°C 0.690 0.700 0.715 5 10 VVDD = 4.5 V, IOUT = 25 mA 9 V ERROR AMPLIFIER
VFB Feedback regulation voltage total variation VSS(offset) Soft-start offset from VSS (1) GBWP Gain bandwidth (1) AVOL Open loop gain 50 ISRC Output source current 2.5 4.5 ISINK Output sink current 2.5 6 IBIAS Input bias current Offset from VSS to error amplifier VFB = 0.7 V V 1
MHz
dB –250 mA
0 nA SHORT CIRCUIT CURRENT PROTECTION
IILIM Current sink into ILIM pin VILIM(ofst) Current limit offset voltage VILIM = 11.5 V, (VSW -VILIM) VVDD = 12 V tHSC Minimum HDRV pulse width During short circuit 135 150 µA –50 –30 –10 mV 135 225 ns Propagation delay to output (1) 50 tBLANK Blanking time (1) 50 ns tOFF Off time during a fault (SS cycle times) 7 cycles (1)
(2)
4 115 Ensured by design. Not production tested.
For zero output voltage only. Does not assure lack of activity on HDRV or LDRV.
Submit Documentation Feedback ns TPS40074 www.ti.com SLUS617B – APRIL 2005 – REVISED OCTOBER 2006 ELECTRICAL CHARACTERISTICS (continued)
TA = –40°C to 85°C, VIN = 12 Vdc, RT = 90.9 kΩ, IKFF = 300 µA, fSW = 500 kHz, all parameters at zero power dissipation
(unless otherwise noted)
PARAMETER
VSW Switching level to end precondition TEST CONDITIONS
(3) MIN (VVDD -VSW) TYP time (3) tPC Precondition VILIM(pre) Current limit precondition voltage threshold (3) MAX 2 UNIT …