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LT3430_02

High Voltage, 3A, 200kHz Step-Down Switching Regulator

Linear Technology 

LT3430

TYPICAL PERFOR A CE CHARACTERISTICS

Switch Peak Current Limit

6

TJ = 25°C

5

TYPICAL

4

GUARANTEED MINIMUM

3

FB Pin Voltage and Current

1.234

2.0

1.229

1.224

1.219

1.214

1.209

1.5

VOLTAGE

1.0

CURRENT

0.5

2

0

20

40

60

80 100

DUTY CYCLE (%)

3430 G01

Lockout and Shutdown

Thresholds

2.4

LOCKOUT

2.0

1.6

1.2

0.8

START-UP

0.4

SHUTDOWN

0

–50 –25 0 25 50 75 100 125

JUNCTION TEMPERATURE (°C)

3430 G04

1.204

0

–50 –25 0 25 50 75 100 125

JUNCTION TEMPERATURE (°C)

3430 G02

Shutdown Supply Current

40

VSHDN = 0V

35

30

25

20

15

10

5

0

0 10 20 30 40 50 60

INPUT VOLTAGE (V)

3430 G05

Error Amplifier Transconductance

2500

2000

1500

1000

Error Amplifier Transconductance

3000

200

PHASE

2500

150

2000

GAIN

( ) 1500 VFB 2 • 10–3

ROUT

200k

100

VC

COUT

12pF

50

500

1000 ERROR AMPLIFIER EQUIVALENT CIRCUIT

0

0

–50 –25 0 25 50 75 100 125

JUNCTION TEMPERATURE (°C)

3430 G07

RLOAD = 50Ω

500

100

1k

10k

100k

FREQUENCY (Hz)

–50

1M 10M

3430 G08

SHDN Pin Bias Current

250

CURRENT REQUIRED TO FORCE SHUTDOWN

200 (FLOWS OUT OF PIN). AFTER SHUTDOWN,

CURRENT DROPS TO A FEW µA

150

100

12

AT 2.38V STANDBY THRESHOLD

(CURRENT FLOWS OUT OF PIN)

6

0

–50 –25 0 25 50 75 100 125

JUNCTION TEMPERATURE (°C)

3430 G03

Shutdown Supply Current

300

250

VIN = 60V

200

VIN = 15V

150

100

50

0

0

0.1

0.2

0.3

0.4

0.5

SHUTDOWN VOLTAGE (V)

3430 G06

Frequency Foldback

600

500

400

300

SWITCHING

FREQUENCY

200

100

0

0

FB PIN

CURRENT

0.5

1.0

VFB (V)

1.5

3430 G09

4

sn3430 3430is

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