Datasheet LT1425 (Analog Devices) - 2
| Manufacturer | Analog Devices |
| Description | Isolated Flyback Switching Regulators |
| Pages / Page | 20 / 2 — ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1). ELECTRICAL … |
| File Format / Size | PDF / 302 Kb |
| Document Language | English |
ABSOLUTE MAXIMUM RATINGS. PACKAGE/ORDER INFORMATION. (Note 1). ELECTRICAL CHARACTERISTICS VIN = 5V, TJ = 25
Model Line for this Datasheet
Text Version of Document
LT1425
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
TOP VIEW ORDER PART Supply Voltage .. 20V GND 1 16 GND NUMBER Switch Voltage ... 35V NC 2 15 SHDN SHDN, SYNC Pin Voltage ... 7V R 3 14 FB ROCOMP RFB Pin Current... 2mA LT1425CS V 4 13 C RCCOMP Operating Junction Temperature Range LT1425IS R 5 12 REF VIN Commercial .. 0°C to 100°C SYNC 6 11 VSW Industrial ... – 40°C to 100°C SGND 7 10 PGND Storage Temperature Range ... – 65°C to 150°C GND 8 9 GND Lead Temperature (Soldering, 10 sec).. 300°C S PACKAGE 16-LEAD PLASTIC SO TJMAX = 145°C, θJA = 75°C/ W Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS VIN = 5V, TJ = 25
°
C, VSW open, VC = 1.4V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Feedback Amplifier
IREF Reference Current Measured at RFB Pin with RREF = 3.000k 402 408 414 µA ● 396 420 µA IIN RREF Pin Input Current 500 nA gm Feedback Amplifier Transconductance ∆IC = ±10µA (Note 2) ● 400 1000 1600 µmho ISOURCE, ISINK Feedback Amplifier Source or Sink Current ● 30 50 80 µA VCL Feedback Amplifier Clamp Voltage 1.9 V Reference Voltage/Current Line Regulation 5V ≤ VIN ≤ 18V ● 0.01 0.04 %/V Voltage Gain (Note 3) 500 V/V VIN Sense Error ● 10 25 mV
Output Switch
BV Output Switch Breakdown Voltage IC = 5mA ● 35 50 V V(VSW) Output Switch ON Voltage ISW = 1A ● 0.55 0.85 V ILIM Switch Current Limit Duty Cycle = 50%, 0°C ≤ TJ ≤ 100°C ● 1.35 1.60 1.9 A Duty Cycle = 50%, – 40°C ≤ TJ ≤ 100°C ● 1.25 1.60 1.9 A Duty Cycle = 80% 1.30 A
Current Amplifier
Control Pin Threshold Duty Cycle = Minimum 0.95 1.2 1.3 V ● 0.85 1.4 V Control Voltage to Switch Transconductance 2 A/V
Timing
f Switching Frequency 260 285 300 kHz ● 240 320 kHz tON Minimum Switch ON Time 170 210 260 ns tED Flyback Enable Delay Time 150 ns tEN Minimum Flyback Enable Time 180 ns Maximum Switch Duty Cycle ● 85 90 95 % 2
W W W U U W U ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1)
TOP VIEW ORDER PART Supply Voltage .. 20V GND 1 16 GND NUMBER Switch Voltage ... 35V NC 2 15 SHDN SHDN, SYNC Pin Voltage ... 7V R 3 14 FB ROCOMP RFB Pin Current... 2mA LT1425CS V 4 13 C RCCOMP Operating Junction Temperature Range LT1425IS R 5 12 REF VIN Commercial .. 0°C to 100°C SYNC 6 11 VSW Industrial ... – 40°C to 100°C SGND 7 10 PGND Storage Temperature Range ... – 65°C to 150°C GND 8 9 GND Lead Temperature (Soldering, 10 sec).. 300°C S PACKAGE 16-LEAD PLASTIC SO TJMAX = 145°C, θJA = 75°C/ W Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS VIN = 5V, TJ = 25
°
C, VSW open, VC = 1.4V, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Feedback Amplifier
IREF Reference Current Measured at RFB Pin with RREF = 3.000k 402 408 414 µA ● 396 420 µA IIN RREF Pin Input Current 500 nA gm Feedback Amplifier Transconductance ∆IC = ±10µA (Note 2) ● 400 1000 1600 µmho ISOURCE, ISINK Feedback Amplifier Source or Sink Current ● 30 50 80 µA VCL Feedback Amplifier Clamp Voltage 1.9 V Reference Voltage/Current Line Regulation 5V ≤ VIN ≤ 18V ● 0.01 0.04 %/V Voltage Gain (Note 3) 500 V/V VIN Sense Error ● 10 25 mV
Output Switch
BV Output Switch Breakdown Voltage IC = 5mA ● 35 50 V V(VSW) Output Switch ON Voltage ISW = 1A ● 0.55 0.85 V ILIM Switch Current Limit Duty Cycle = 50%, 0°C ≤ TJ ≤ 100°C ● 1.35 1.60 1.9 A Duty Cycle = 50%, – 40°C ≤ TJ ≤ 100°C ● 1.25 1.60 1.9 A Duty Cycle = 80% 1.30 A
Current Amplifier
Control Pin Threshold Duty Cycle = Minimum 0.95 1.2 1.3 V ● 0.85 1.4 V Control Voltage to Switch Transconductance 2 A/V
Timing
f Switching Frequency 260 285 300 kHz ● 240 320 kHz tON Minimum Switch ON Time 170 210 260 ns tED Flyback Enable Delay Time 150 ns tEN Minimum Flyback Enable Time 180 ns Maximum Switch Duty Cycle ● 85 90 95 % 2
