LT1246 Ver la hoja de datos (PDF) - Linear Technology
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LT1246 Datasheet PDF : 12 Pages
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LT1246/LT1247
TYPICAL PERFOR A CE CHARACTERISTICS
Output Deadtime vs
Oscillator Frequency
60
50
5nF 2nF 1nF
40
30
500pF
20
10
0
0
100pF
100
1000
OSCILLATOR FREQUENCY (kHz)
LT1246 • TPC18*
Timing Resistor vs
Oscillator Frequency
100
100pF
200pF
1nF
500pF
10
CT =10nF
2nF
5nF
VCC = 15V
TJ = 25°C
1
10k
100k
1M
OSCILLATOR FREQUENCY (Hz)
LT1246 • TPC19
Output Rise and Fall Time
Current Sense Delay
Output Cross-Conduction
VCC = 15V
CL = 1nF
TIME 50ns/DIV
1246/7 G20
VCC = 15V
CL = 1nF
TIME 50ns/DIV
1246/7 G21
VCC = 15V
CL = 15pF
TIME 50ns/DIV
1246/7 G22
PI FU CTI S
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.
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.).
6
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