LT1247 Linear Technology, LT1247 Datasheet - Page 5

• Manufacturer Part Number: LT1247
• Description: 1MHz Off-Line Current Mode PWM and DC/DC Converter
• Manufacturer: Linear Technology

TYPICAL PERFOR
2.55
2.54
2.53
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
1.0
0.5
0
–50
0
Low Level Output
Saturation Voltage
Feedback Pin Input Voltage
–25
OUTPUT SINK CURRENT (mA)
0
TEMPERATURE ( C)
T
25
J
100
–20
= 25 C
100
80
60
40
20
0
10
Error Amplifier Open-Loop Gain
and Phase
50
T
J
100
= 125 C
75
T
W
J
LT1246 • TPC13
LT1246 • TPC10
= – 55 C
100
1k
FREQUENCY (Hz)
GAIN
A
U
200
125
10k
CE
100k
PHASE
C
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
HARA TERISTICS
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
LT1246 • TPC16
0
1M
–50
0
Low Level Output Saturation Voltage
During Undervoltage Lockout
Current Sense Clamp Voltage
–25
10M
T
OUTPUT SINK CURRENT (mA)
J
225
180
135
90
45
0
–45
C
= 125 C
0
TEMPERATURE ( C)
25
T
5
J
= – 55 C
50
T
J
= 25 C
75
LT1246 • TPC14
LT1246 • TPC11
1.2
1.0
0.8
0.6
0.4
0.2
100
0
Current Sense Input Threshold
0
125
10
ERROR AMP OUTPUT VOLTAGE (V)
1
T
J
=125 C
2
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
14
13
12
11
10
0
9
10k
0
High Level Output
Saturation Voltage
Supply Current vs
Oscillator Frequency
3
T
J
OUTPUT SOURCE CURRENT (mA)
= 25 C
LT1246/LT1247
OSCILLATOR FREQUENCY (Hz)
4
T
J
= – 55 C
LT1246 • TPC17
5
100k
100
6
T
T
T
J
J
J
= –55 C
= 25 C
= 125 C
LT1246 • TPC12
LT1246 • TPC15
5
200
1M