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LTC4278CDKDPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC4278CDKDPBF Datasheet(HTML) 4 Page - Linear Technology |
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4 / 40 page  LTC4278 4 4278f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS PWM Controller (Note 10) Power Supply VCC Operating Range ● 4.5 20 V VCC Supply Current (ICC) VCMP = Open (Note 11) ● 4 6.4 10 mA VCC Shutdown Current VCMP = Open, VUVLO = 0V ● 50 150 μA Feedback Amplifier Feedback Regulation Voltage (VFB) ● 1.220 1.237 1.251 V Feedback Pin Input Bias Current RCMP Open 200 nA Feedback Amplifier Transconductance ΔIC = ±10μA ● 700 1000 1400 μmho Feedback Amplifier Source or Sink Current ● 25 55 90 μA Feedback Amplifier Clamp Voltage VFB = 0.9V VFB = 1.4V 2.56 0.84 V V Reference Voltage Line Regulation 12V ≤ VCC ≤ 18V ● 0.005 0.05 %/ V Feedback Amplifier Voltage Gain VCMP = 1.2V to 1.7V 1400 V/ V Soft-Start Charging Current VSFST = 1.5V 16 20 25 μA Soft-Start Discharge Current VSFST = 1.5V, VUVLO = 0V 0.7 1.3 mA Control Pin Threshold (VCMP) Duty Cycle = Min 1 V Gate Outputs PG, SG Output High Level ● 6.6 7.4 8 V PG, SG Output Low Level ● 0.01 0.05 V PG, SG Output Shutdown Strength VUVLO = 0V; IPG, ISG = 20mA ● 1.6 2.3 V PG Rise Time CPG = 1nF 11 ns SG Rise Time CSG = 1nF 15 ns PG, SG Fall Time CPG, CSG = 1nF 10 ns Current Amplifier Switch Current Limit at Maximum VCMP VSENSE+ ● 88 98 110 mV ΔVSENSE /ΔVCMP 0.07 V/ V Sense Voltage Overcurrent Fault Voltage VSENSE+, VSFST < 1V ● 206 230 mV Timing Switching Frequency (fOSC)COSC = 100pF ● 84 100 110 kHz Oscillator Capacitor Value (COSC) (Note 12) 33 200 pF Minimum Switch On Time (tON(MIN)) 200 ns Flyback Enable Delay Time (tENDLY) 265 ns PG Turn-On Delay Time (tPGDLY) 200 ns Maximum Switch Duty Cycle ● 85 88 % SYNC Pin Threshold ● 1.53 2.1 V SYNC Pin Input Resistance 40 kΩ |
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