Datasheet LT3753 (Analog Devices) - 5
| Manufacturer | Analog Devices |
| Description | Active Clamp Synchronous Forward Controller |
| Pages / Page | 36 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply … |
| Revision | B |
| File Format / Size | PDF / 1.7 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS. The. denotes the specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LT3753
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 Error Amplifier
FB Reference Voltage l 1.220 1.250 1.275 V FB Line Reg 8.5V < VIN < 100V 0.1 0.3 mV/V FB Load Reg COMP_SW – 0.1V < COMP < COMP_VOH – 0.1V 0.1 0.3 mV/V FB Input Bias Current (Note 8) 50 200 nA Open-Loop Voltage Gain 85 dB Unity-Gain Bandwidth (Note 6) 2.5 MHz COMP Source Current FB = 1V, COMP = 1.75V (Note 8) 6 11 mA 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
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 8) 2 µA ISENSEP Input Current (D = 80%) (Note 8) 33 µA ISENSEN Input Current FB = 1.5V (COMP Open) (Note 8) 20 30 µA FB = 1V (COMP Open) (Note 8) 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)
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 UVLO_VSEC = 0V, INTVCC = 8V, IAOUT = 1mA Out 7.8 V of 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 9) 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 10) 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 11) 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 9, 11) 70 110 132 ns RTAO = 44.2k, RTAS = 73.2k –70 –110 –132 ns Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Package Description Revision History Typical Application Related Parts
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 Error Amplifier
FB Reference Voltage l 1.220 1.250 1.275 V FB Line Reg 8.5V < VIN < 100V 0.1 0.3 mV/V FB Load Reg COMP_SW – 0.1V < COMP < COMP_VOH – 0.1V 0.1 0.3 mV/V FB Input Bias Current (Note 8) 50 200 nA Open-Loop Voltage Gain 85 dB Unity-Gain Bandwidth (Note 6) 2.5 MHz COMP Source Current FB = 1V, COMP = 1.75V (Note 8) 6 11 mA 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
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 8) 2 µA ISENSEP Input Current (D = 80%) (Note 8) 33 µA ISENSEN Input Current FB = 1.5V (COMP Open) (Note 8) 20 30 µA FB = 1V (COMP Open) (Note 8) 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)
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 UVLO_VSEC = 0V, INTVCC = 8V, IAOUT = 1mA Out 7.8 V of 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 9) 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 10) 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 11) 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 9, 11) 70 110 132 ns RTAO = 44.2k, RTAS = 73.2k –70 –110 –132 ns Rev. B For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Table of Contents Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Timing Diagrams Operation Applications Information Package Description Revision History Typical Application Related Parts
