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LM2638 bảng dữ liệu(PDF) 3 Page - Texas Instruments |
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LM2638 bảng dữ liệu(HTML) 3 Page - Texas Instruments |
3 / 8 page OBSOLETE LM2638 www.ti.com SNVS046A – MAY 2004 – REVISED NOVEMBER 2004 Electrical Characteristics VCC = 5V, VDD = 12V unless otherwise specified. Typicals and limits appearing in plain type apply for TA = TJ = +25°C. Limits appearing in boldface type apply over the 0°C to +70°C range. Symbol Parameter Conditions Min Typ Max Units IEN EN Pin Internal Pull-up Current 60 90 140 µA ICC Operating VCC Current EN = 5V, VID = 10111 6 7.5 mA IQ_VCC VCC Shutdown Current EN = 0V, VID Pins Floating 1.5 3 mA IQ_VDD VDD Shutdown Current EN = 0V, VID Pins Floating 4 µA RDS_CP CP Pin Resistance High Side FET 100 Ω Low Side FET 10 SWITCHING SECTION VDACOUT 5-Bit DAC Output Voltage (1) N −1.5% N N+1.5% V IVID VID Pins Internal Pull-up Current 60 90 140 µA fOSC Oscillator Frequency RT = 100 k Ω 204 245 286 kHz RT = 25 k Ω 1000 DMAX Maximum Duty Cycle 100 % DMIN Minimum Duty Cycle 0 % RSNS1 SNS1 Pin Resistance to Ground 8.5 10 13 k Ω RDS_SRC Gate Driver Resistance When 6 Ω Sourcing Current RDS_SINK Gate Driver Resistance When 1.5 Ω Sinking Current VCC_TH1 VCC Power-On-Reset Threshold 4.0 4.3 V VCC_TH2 VCC Shutdown Threshold 3.0 3.6 V VDAC_IH DAC Input High Voltage 3.5 V VDAC_IL DAC Input Low Voltage 1.3 V GA Error Amplifier DC Gain 76 dB BWEA Error Amplifier Unity Gain 5 MHz Bandwidth VRAMP_L Ramp Signal Valley Voltage 1.25 V VRAMP_H Ramp Signal Peak Voltage 3.25 V tSS Soft Start Time Clock 4096 Cycles DSTEP_SS Duty Cycle Step Change during 12.5 % Soft Start tPWGD PWGD Response Time SNS1 Rises from 0V to Rated 2 8.4 15 µs Output Voltage tPWBAD PWGD Response Time SNS1 Falls from Rated Output 2 3.4 10 µs Voltage to 0V VPWGD_HI PWGD High Trip Point % Above Rated Output Voltage 11.5 13 When Output Voltage ↑ % % Above Rated Output Voltage 5 7 9 When Output Voltage ↓ (2) VPWGD_LO PWGD Low Trip Point % Below Rated Output Voltage 2.6 6 When Output Voltage ↑ % % Below Rated Output Voltage 6 9.5 13 When Output Voltage ↓ (2) VOVP_TRP Over-Voltage Trip Point % SNS1 Above Rated Output 15 25 35 % ICS+ CS+ Pin Sink Current CS+ = 5V, CS − = 4.8V 126 185 244 µA (1) The letter N stands for the typical output voltages appearing in italic boldface type in Table 1. (2) The output level of the PWGD pin is a logic AND of the power good function of the switching section, the 1.5V section and the 1.25V section. For the switching section, the power good is a window. For the two linear sections, the power good is a threshold with some hysteresis. Copyright © 2004, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM2638 |
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