Datasheet LT3430, LT3430-1 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | High Voltage, 3A, 200kHz/100kHz Step-Down Switching Regulators |
| Pages / Page | 28 / 4 — TYPICAL PERFORMANCE CHARACTERISTICS. Switch Peak Current Limit. FB Pin … |
| File Format / Size | PDF / 335 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Switch Peak Current Limit. FB Pin Voltage and Current. N Pin Bias Current
Model Line for this Datasheet
Text Version of Document
LT3430/LT3430-1
TYPICAL PERFORMANCE CHARACTERISTICS Switch Peak Current Limit FB Pin Voltage and Current
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S
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H
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D
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N Pin Bias Current
6 1.234 2.0 250 TJ = 25°C CURRENT REQUIRED TO FORCE SHUTDOWN 1.229 200 (FLOWS OUT OF PIN). AFTER SHUTDOWN, CURRENT DROPS TO A FEW µA 5 1.5 TYPICAL CURRENT ( 1.224 150 µA) VOLTAGE 4 1.219 1.0 100 µA) CURRENT CURRENT ( 1.214 12 GUARANTEED MINIMUM AT 2.38V STANDBY THRESHOLD 3 FEEDBACK VOLTAGE (V) 0.5 SWITCH PEAK CURRENT (A) (CURRENT FLOWS OUT OF PIN) 1.209 6 2 1.204 0 0 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 3430 G01 3430 G02 3430 G03
Lockout and Shutdown Threshold Shutdown Supply Current Shutdown Supply Current
2.4 40 300 VSHDN = 0V TA = 25°C LOCKOUT 35 TA = 25°C 2.0 250 µA) µA) 30 VIN = 60V 1.6 200 25 VIN = 15V 1.2 20 150 15 0.8 100 SHDN PIN VOLTAGE (V) 10 START-UP INPUT SUPPLY CURRENT ( INPUT SUPPLY CURRENT ( 0.4 50 5 SHUTDOWN 0 0 0 –50 –25 0 25 50 75 100 125 0 10 20 30 40 50 60 0 0.1 0.2 0.3 0.4 0.5 JUNCTION TEMPERATURE (°C) INPUT VOLTAGE (V) SHUTDOWN VOLTAGE (V) 3430 G04 3430 G05 3430 G06
Error Amplifi er Transconductance Error Amplifi er Transconductance Frequency Foldback
2500 3000 200 600 TA = 25°C PHASE 500 2000 2500 150 µmho) GAIN PHASE µA) 400 1500 2000 100 FB PIN µMho) CURRENT V (DEG) C 300 R C SWITCHING 1000 1500 OUT OUT GAIN ( 50 V ( FB 2 • 10–3 ) 200k 12pF FREQUENCY 3430 200 OR FB CURRENT ( TRANSCONDUCTANCE ( 500 1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT 0 SWITICHING FREQUENCY (kHz) 3430-1 100 RLOAD = 50Ω TA = 25°C 0 500 –50 0 –50 –25 0 25 50 75 100 125 100 1k 10k 100k 1M 10M 0 0.5 1.0 1.5 JUNCTION TEMPERATURE (°C) FREQUENCY (Hz) VFB (V) 3430 G08 3430 G07 3430 G09 34301fa 4
TYPICAL PERFORMANCE CHARACTERISTICS Switch Peak Current Limit FB Pin Voltage and Current
⎯
S
⎯
H
⎯
D
⎯
N Pin Bias Current
6 1.234 2.0 250 TJ = 25°C CURRENT REQUIRED TO FORCE SHUTDOWN 1.229 200 (FLOWS OUT OF PIN). AFTER SHUTDOWN, CURRENT DROPS TO A FEW µA 5 1.5 TYPICAL CURRENT ( 1.224 150 µA) VOLTAGE 4 1.219 1.0 100 µA) CURRENT CURRENT ( 1.214 12 GUARANTEED MINIMUM AT 2.38V STANDBY THRESHOLD 3 FEEDBACK VOLTAGE (V) 0.5 SWITCH PEAK CURRENT (A) (CURRENT FLOWS OUT OF PIN) 1.209 6 2 1.204 0 0 0 20 40 60 80 100 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) JUNCTION TEMPERATURE (°C) JUNCTION TEMPERATURE (°C) 3430 G01 3430 G02 3430 G03
Lockout and Shutdown Threshold Shutdown Supply Current Shutdown Supply Current
2.4 40 300 VSHDN = 0V TA = 25°C LOCKOUT 35 TA = 25°C 2.0 250 µA) µA) 30 VIN = 60V 1.6 200 25 VIN = 15V 1.2 20 150 15 0.8 100 SHDN PIN VOLTAGE (V) 10 START-UP INPUT SUPPLY CURRENT ( INPUT SUPPLY CURRENT ( 0.4 50 5 SHUTDOWN 0 0 0 –50 –25 0 25 50 75 100 125 0 10 20 30 40 50 60 0 0.1 0.2 0.3 0.4 0.5 JUNCTION TEMPERATURE (°C) INPUT VOLTAGE (V) SHUTDOWN VOLTAGE (V) 3430 G04 3430 G05 3430 G06
Error Amplifi er Transconductance Error Amplifi er Transconductance Frequency Foldback
2500 3000 200 600 TA = 25°C PHASE 500 2000 2500 150 µmho) GAIN PHASE µA) 400 1500 2000 100 FB PIN µMho) CURRENT V (DEG) C 300 R C SWITCHING 1000 1500 OUT OUT GAIN ( 50 V ( FB 2 • 10–3 ) 200k 12pF FREQUENCY 3430 200 OR FB CURRENT ( TRANSCONDUCTANCE ( 500 1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT 0 SWITICHING FREQUENCY (kHz) 3430-1 100 RLOAD = 50Ω TA = 25°C 0 500 –50 0 –50 –25 0 25 50 75 100 125 100 1k 10k 100k 1M 10M 0 0.5 1.0 1.5 JUNCTION TEMPERATURE (°C) FREQUENCY (Hz) VFB (V) 3430 G08 3430 G07 3430 G09 34301fa 4
