lt1766efe-trpbf Linear Technology Corporation, lt1766efe-trpbf Datasheet - Page 5

• Manufacturer Part Number: lt1766efe-trpbf
• Description: High Voltage 1.5a, 200khz Step-down Switching Regulators
• Manufacturer: Linear Technology Corporation

TYPICAL PERFOR A CE CHARACTERISTICS
2.5
2.0
1.5
1.0
2.4
2.0
1.6
1.2
0.8
0.4
2500
2000
1500
1000
500
0
–50
0
Switch Peak Current Limit
0
Lockout and Shutdown
Thresholds
T
–50
A
Error Amplifier Transconductance
= 25°C
–25
–25
JUNCTION TEMPERATURE (°C)
20
JUNCTION TEMPERATURE (°C)
GUARANTEED MINIMUM
0
0
DUTY CYCLE (%)
25
40
25
TYPICAL
LOCKOUT
START-UP
SHUTDOWN
50
50
60
75
75
100
W
100
80
125
1766 G01
1766 G04
125
1766 G07
U
100
150
150
1.234
1.229
1.214
1.204
1.224
1.219
1.209
3000
2500
2000
1500
1000
500
–50
100
40
35
30
25
20
15
10
Error Amplifier Transconductance
FB Pin Voltage and Current
5
0
T
ERROR AMPLIFIER EQUIVALENT CIRCUIT
A
V
R
0
Shutdown Supply Current
FB 2 • 10
= 25°C
LOAD
–25
V
T
A
(
SHDN
= 25°C
JUNCTION TEMPERATURE (°C)
1k
= 50Ω
10
–3
0
= 0V
GAIN
)
FREQUENCY (Hz)
25
INPUT VOLTAGE (V)
PHASE
10k
20
CURRENT
VOLTAGE
50
R
200k
30
OUT
100k
75
100 125 150
40
1M
C
12pF
OUT
V
1766 G02
50
1766 G08
C
1766 G05
10M
0.5
0
200
150
100
50
0
–50
2.0
1.5
1.0
60
250
200
150
100
300
250
200
150
100
50
100
12
600
500
400
300
200
6
0
0
–50
0
SHDN Pin Bias Current
0
Shutdown Supply Current
T
0
Frequency Foldback
LT1766/LT1766-5
CURRENT REQUIRED TO FORCE SHUTDOWN
(FLOWS OUT OF PIN). AFTER SHUTDOWN,
CURRENT DROPS TO A FEW µA
A
T
A
= 25°C
–25
= 25°C
AT 2.38V STANDBY THRESHOLD
(CURRENT FLOWS OUT OF PIN)
0.1
JUNCTION TEMPERATURE (°C)
SHUTDOWN VOLTAGE (V)
0
V
IN
0.5
= 60V
0.2
25
V
FB
50
V
(V)
0.3
IN
75
= 15V
1.0
100
FREQUENCY
SWITCHING
CURRENT
0.4
FB PIN
125
1766 G03
1766 G06
1766 G09
1766fb
5
150
0.5
1.5