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LM3502ITLX-16NOPB Fiches technique(PDF) 5 Page - Texas Instruments |
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LM3502ITLX-16NOPB Fiches technique(HTML) 5 Page - Texas Instruments |
5 / 28 page LM3502 www.ti.com SNVS339A – SEPTEMBER 2005 – REVISED AUGUST 2006 Preliminary Electrical Characteristics (1) (2) (continued) Limits in standard typeface are for TJ = 25°C. Limits in bold typeface apply over the full operating junction temperature range ( −40°C ≤ TJ ≤ +125°C). Unless otherwise specified, VIN = 2.5V. Symbol Parameter Conditions Min Typ Max Units ICL NMOS Power Switch −16, Fb = 0V 250 400 650 Current Limit −25, Fb = 0V 400 600 800 mA −35, Fb = 0V 450 750 1050 −44, Fb = 0V 450 750 1050 IFb Feedback Pin Bias Fb = 0.25V 64 500 nA Current (3) FS Switching Frequency 0.8 1 1.2 MHz RDS(ON) NMOS Power Switch ON ISw = 500 mA Resistance 0.55 1.1 Ω (Figure 4: N1) RPDS(ON) PMOS ON Resistance of IPMOS = 20 mA, En1 = 0V, En2 = 1.5V VOUT1/VOUT2 Switch 5 10 Ω (Figure 4: N1) RNDS(ON) NMOS ON Resistance of INMOS = 20 mA, En1 = 1.5V, En2 = 0V VOUT2/Fb Switch 2.5 5 Ω (Figure 4: N2) DMAX Maximum Duty Cycle Fb = 0V 90 95 % ICntrl Cntrl Pin Input Bias Cntrl = 2.5V 7 14 µA Current (4) Cntrl = 0V 0.1 ISw Sw Pin Leakage Current Sw = 42V, Cntrl = 0V 0.01 5 µA (5) IVOUT1(OFF) VOUT1 Pin Leakage VOUT1 = 14V, Cntrl = 0V (16) 0.1 3 Current (5) VOUT1 = 23V, Cntrl = 0V (25) 0.1 3 µA VOUT1 = 32V, Cntrl = 0V (35) 0.1 3 VOUT1 = 42V, Cntrl = 0V (44) 0.1 3 IVOUT1(ON) VOUT1 Pin Bias Current VOUT1 = 14V, Cntrl = 1.5V (16) 40 80 (5) VOUT1 = 23V, Cntrl = 1.5V (25) 50 100 µA VOUT1 = 32V, Cntrl = 1.5V (35) 50 100 VOUT1 = 42V, Cntrl = 1.5V (44) 85 140 IVOUT2 VOUT2 Pin Leakage Fb = 0V, Cntrl = 0V, VOUT2 = 42V 0.1 3 µA Current (5) UVP Under-Voltage On Threshold 2.4 2.5 V Protection Off Threshold 2.2 2.3 OVP Over-Voltage Protection On Threshold (16) 14.5 15.5 16.5 (6) Off Threshold (16) 14.0 15 16.0 On Threshold (25) 22.5 24 25.5 Off Threshold (25) 21.5 23 24.5 V On Threshold (35) 32.0 34 35.0 Off Threshold (35) 31.0 33 34.0 On Threshold (44) 40.5 42 43.5 Off Threshold (44) 39.0 41 42.0 VEn1 PMOS FET Switch Off Threshold (Display Lighting) 0.8 0.3 Enabling Threshold On Threshold (Display Lighting) 1.4 0.8 V (Figure 4: P1) VEn2 NMOS FET Switch Off Threshold (Display Lighting) 0.8 0.3 Enabling Threshold On Threshold (Display Lighting) 1.4 0.8 V (Figure 4: N2) VCntrl Device Enabling Off Threshold 0.8 0.3 V Threshold OnThreshold 1.4 0.8 TSHDW Shutdown Delay Time 8 12 16 ms IEn1 En1 Pin Input Bias En1 = 2.5V 7 14 µA Current En1 = 0V 0.1 (3) Current flows out of the pin. (4) Current flows into the pin. (5) Current flows into the pin. (6) The on threshold indicates that the LM3502 is no longer switching or regulating LED current, while the off threshold indicates normal operation. Copyright © 2005–2006, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM3502 |
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