LT1246CS8 datasheet(6/12 Pages) LINER

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LT1246/LT1247

HARA TERISTICS

TYPICALPERFOR

Timing Resistor vs

Oscillator Frequency

ISENSE (Pin 3): Current Sense. This is the input to the

current sense comparator. The trip point of the compara-

tor is set by, and is proportional to, the output voltage of

the Error Amplifier.

RT/CT (Pin 4) : The oscillator frequency and the deadtime

are set by connecting a resistor (RT) from VREF to RT/CT

and a capacitor (CT) from RT/CT to GND.

The rise time of the oscillator waveform is set by the RC

time constant of RT and CT. The fall time, which is equal to

the output deadtime, is set by a combination of the RC time

constant and the oscillator sink current (8.2mA typ.).

COMP (Pin 1): Compensation Pin. This pin is the output of

the Error Amplifier and is made available for loop compen-

sation. It can also be used to adjust the maximum value of

the current sense clamp voltage to less than 1V. This pin

can source a minimum of 0.5mA (0.8mA typ.) and sink a

minimum of 2mA (4mA typ.)

FB (Pin 2): Voltage Feedback. This pin is the inverting

input of the Error Amplifier. The output voltage is normally

fed back to this pin through a resistive divider. The

noninverting input of the Error Amplifier is internally

committed to a 2.5V reference point.

FU C

OSCILLATOR FREQUENCY (Hz)

10k

100

100k

LT1246 • TPC19

5nF

2nF

100pF

CT =10nF

1nF

VCC = 15V

TJ = 25°C

500pF

200pF

VCC = 15V

TIME 50ns/DIV

CL = 1nF

1246/7 G20

VCC = 15V

TIME 50ns/DIV

CL = 1nF

1246/7 G21

Output Rise and Fall Time

Current Sense Delay

Output Cross-Conduction

VCC = 15V

TIME 50ns/DIV

CL = 15pF

1246/7 G22

Output Deadtime vs

Oscillator Frequency

OSCILLATOR FREQUENCY (kHz)

100

1000

LT1246 • TPC18*

5nF

2nF

1nF

100pF

500pF

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