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LT1508C Datasheet(PDF) 4 Page - Linear Technology |
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LT1508C Datasheet(HTML) 4 Page - Linear Technology |
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4 / 16 page  4 LT1508 IM IAC (VAOUT – 2) 2 The q denotes specifications which apply over the full operating temperature range. Note 1: Multiplier Gain Constant: K = Note 2: GTDR2 (PWM) pulse is delayed by 53% duty cycle after GTDR1 (PFC) is set. See PFC/PWM Synchronization graph in the Typical Performance Characteristics section. TYPICAL PERFORMANCE CHARACTERISTICS PFC Voltage Amplifier Open-Loop Gain and Phase FREQUENCY (Hz) 10 100 80 60 40 20 0 –20 100 1k 10k 100k 1508 G01 1M 10M 0 –20 –40 –60 –80 –100 –120 PHASE GAIN FREQUENCY (Hz) 10 100 80 60 40 20 0 –20 100 1k 10k 100k 1508 G02 1M 10M 0 –20 –40 –60 –80 –100 –120 PHASE GAIN PFC Current Amplifier Open-Loop Gain and Phase TIME 1508 G03 PFC (GTDR1) 53% PWM (GTDR2) PFC/PWM Synchronization ELECTRICAL C C HARA TERISTICS VCC = 18V, RSET = 15k to GND, CSET = 1nF to GND, IAC = 100µA, ISENSE = 0V, CAOUT = 3.5V, VAOUT = 5V, OVP = VREF. No load on any outputs, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Soft Start Current SS1 Current (PFC) SS1 = 2.5V q 512 30 µA SS2 Current (PWM) SS2 = 1V q 512 30 µA Comparators in PWM Section ILIM Input Current ILIM = 0V, VC = 1.6V q – 0.3 – 2 µA Current Limit Comparator (CL) Threshold VC > 2.6V q 0.95 1.1 1.20 V GTDR2 Switching Off Threshold at VC or at SS2 ILIM = 0V q 1V VC Input Current VC = 0V q –20 – 80 µA PWMOK Comparator Low Threshold (in Terms of VREF) q 0.57 0.63 0.70 VC Pin High Voltage 1mA into VC Pin q 6.2 6.9 7.5 V GTDR2 Turn-On Blanking Time 180 ns |
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