Datasheet

5
LT1777
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Switching Frequency
vs Temperature
Minimum Synchronization
Voltage vs Temperature
Output dI/dt Sense Voltage
vs Temperature
V
C
Pin Switching Threshold,
Clamp Voltage vs Temperature
Feedback Amplifier Output
Current vs FB Pin Voltage
Error Amplifier Transconductance
vs Temperature
TEMPERATURE (°C)
SWITCHING FREQUENCY (kHz)
106
104
102
100
98
96
94
1777 G07
–50 25 75
–25 0
50 100 125
TEMPERATURE (°C)
MINIMUM SYNCHRONIZATION VOLTAGE (V)
2.25
2.00
1.75
1.50
1.25
1.00
0.75
1777 G08
–50 25 75
–25 0
50 100 125
TEMPERATURE (°C)
dI/dt SENSE VOLTAGE (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
1777 G09
–50 25 75
–25 0
50 100 125
TEMPERATURE (°C)
–50
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
25 75
1777 G10
–25 0
50 100 125
V
C
PIN VOLTAGE (V)
CLAMP
VOLTAGE
SWITCHING
THRESHOLD
FB PIN VOLTAGE (V)
1.0
FEEDBACK AMPLIFIER OUTPUT CURRENT (µA)
100
50
0
–50
–100
–150
1.4
1777 G11
1.1
1.2
1.3
1.5
25°C
125°C
–55°C
TEMPERATURE (°C)
–50
750
700
650
600
550
500
450
400
25 75
1777 G12
–25 0
50 100 125
TRANSCONDUCTANCE (µmho)