Datasheet LT3752, LT3752-1 (Analog Devices) - 6

LT3752/LT3752-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, UVLO_VSEC = 2.5V. PARAMETER CONDITIONS MIN TYP MAX UNITS
COMP Sink Current FB = 1.5V, COMP = 1.75V 6.5 11.5 mA COMP Output High Clamp FB = 1V 2.6 V COMP Switching Threshold 1.25 V
Current Sense (Main Loop)
ISENSEP Maximum Threshold FB = 1V, OC = 0V 180 220 260 mV COMP Current Mode Gain ∆VCOMP/∆VISENSEP 6.1 V/V ISENSEP Input Current (D = 0%) (Note 10) 2 µA ISENSEP Input Current (D = 80%) (Note 10) 33 µA ISENSEN Input Current FB = 1.5V (COMP Open) (Note 10) 20 30 µA FB = 1V (COMP Open) (Note 10) 90 135 µA OC Overcurrent Threshold l 82.5 96 107.5 mV OC Input Current 200 500 nA
AOUT Driver (Active Clamp Switch Control) (LT3752 External PMOS; LT3752-1 External NMOS)
AOUT Rise Time CL = 1nF (Note 5), INTVCC = 12V 23 ns AOUT Fall Time CL = 1nF (Note 5), INTVCC = 12V 19 ns AOUT Low Level 0.1 V AOUT High Level INTVCC = 12V 11.9 V AOUT High Level in Shutdown (LT3752) UVLO_VSEC = 0V, INTVCC = 8V, IAOUT = 1mA Out 7.8 V of the Pin AOUT Low Level in Shutdown (LT3752-1) UVLO_VSEC = 0V, INTVCC = 12V, IAOUT = 1mA Into 0.25 V the Pin AOUT Edge to OUT (Rise): (tAO) CSOUT = 1nF, COUT = 3.3nF, INTVCC = 12V RTAO = 44.2k 168 218 268 ns RTAO = 73.2k (Note 11) 253 328 403 ns OUT (Fall) to AOUT Edge: (tOA) CSOUT = 1nF, COUT = 3.3nF, INTVCC = 12V RTAO = 44.2k 150 196 250 ns RTAO = 73.2k (Note 12) 214 295 376 ns
SOUT Driver (Synchronous Rectification Control)
SOUT Rise Time COUT = 1nF, INTVCC = 12V (Note 5) 21 ns SOUT Fall Time COUT = 1nF, INTVCC = 12V (Note 5) 19 ns SOUT Low Level 0.1 V SOUT High Level INTVCC = 12V 11.9 V SOUT High Level in Shutdown UVLO_VSEC = 0V, INTVCC = 8V, ISOUT = 1mA Out 7.8 V of the Pin AOUT Edge to SOUT (Fall): (tAS) CAOUT = CSOUT = 1nF, INTVCC = 12V RTAS = 44.2k (Note 13) 168 218 268 ns RTAS = 73.2k 253 328 403 ns SOUT (Fall) to OUT (Rise): (tSO = tAO – tAS) CSOUT = 1nF, COUT = 3.3nF, INTVCC = 12V RTAO = 73.2k, RTAS = 44.2k (Notes 11, 13) 70 110 132 ns RTAO = 44.2k, RTAS = 73.2k –70 –110 –132 ns OUT (Fall) to SOUT (Rise): (tOS) CSOUT = 1nF, COUT = 3.3nF, INTVCC = 12V RTOS = 14.7k 52 68 84 ns RTOS = 44.2k (Note 14) 102 133 164 ns
OUT Driver (Main Power Switch Control)
OUT Rise Time COUT = 3.3nF, INTVCC = 12V (Note 5) 19 ns OUT Fall Time COUT = 3.3nF, INTVCC = 12V (Note 5) 20 ns OUT Low Level 0.1 V Rev. C 6 For more information www.analog.com Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts