1766 Просмотр технического описания (PDF) - Linear Technology
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1766 Datasheet PDF : 30 Pages
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LT1766/LT1766-5
ELECTRICAL CHARACTERISTICS (LT1766E/LT1766I Grade)
The l denotes
VIN = 15V, VC =
specifications
1.5V, SHDN =
which apply over the full operating temperature
1V, BOOST open circuit, SW open circuit, unless
range, otherwise
otherwise noted.
specifications
are
at
TJ
=
25°C.
PARAMETER
Switch On-Resistance
Maximum Switch Duty Cycle
Switch Frequency
fSW Line Regulation
fSW Frequency Shifting Threshold
Minimum Input Voltage
Minimum Boost Voltage
Boost Current (Note 5)
Input Supply Current (IVIN)
Bias Supply Current (IBIAS)
Shutdown Supply Current
Lockout Threshold
Shutdown Thresholds
Minimum SYNC Amplitude
SYNC Frequency Range
SYNC Input Resistance
CONDITIONS
ISW = 1.5A, Boost = VIN + 5V (Note 7)
FB = 1V or VSENSE = 4.1V
VC Set to Give DC = 50%
5.5V ≤ VIN ≤ 60V
Df = 10kHz
(Note 3)
(Note 4) ISW ≤ 1.5A
Boost = VIN + 5V, ISW = 0.5A
Boost = VIN + 5V, ISW = 1.5A
(Note 6) VBIAS = 5V
(Note 6) VBIAS = 5V
SHDN = 0V, VIN ≤ 60V, SW = 0V, VC Open
VC Open
VC Open, Shutting Down
VC Open, Starting Up
MIN TYP MAX UNITS
0.2
0.3
Ω
l
0.4
Ω
93
96
%
l 90
%
184
200
216
kHz
l 172
200
228
kHz
l
0.05 0.15
%/V
0.8
V
l
4.6
5.5
V
l
1.8
3
V
l
12
25
mA
l
45
70
mA
1.4
2.2
mA
2.9
4.2
mA
25
75
μA
l
200
μA
l 2.3
2.42 2.53
V
l 0.15 0.37
0.6
V
l 0.25 0.45
0.6
V
l
1.5
2.2
V
228
700
kHz
20
kΩ
(LT1766H Grade)
The l denotes
VIN = 15V, VC =
specifications
1.5V, SHDN =
which apply over the full operating temperature
1V, BOOST open circuit, SW open circuit, unless
range, otherwise
otherwise noted.
specifications
are
at
TJ
=
25°C.
PARAMETER
CONDITIONS
MIN TYP MAX
Reference Voltage (VREF)
FB Input Bias Current
5.5V ≤ VIN ≤ 60V
VOL + 0.2 ≤ VC ≤ VOH – 0.2
1.204
l 1.175
l
1.219
–0.5
1.234
1.265
–1.5
Error Amp Voltage Gain
(Notes 2, 9)
200 400
Error Amp gm
dl (VC) = ±10μA (Note 9)
1500 2000 3000
l 900
4200
VC to Switch gm
1.7
EA Source Current
EA Sink Current
VC Switching Threshold
VC High Clamp
Switch Current Limit
Switch On Resistance
FB = 1V or VSENSE = 4.1V
FB = 1.4V or VSENSE = 5.7V
Duty Cycle = 0
SHDN = 1V
l 125
225
400
l 100
225
450
0.9
2.1
VC Open, Boost = VIN + 5V, FB = 1V or VSENSE = 4.1V l 0.75
2
3
ISW = 0.75A, Boost = VIN + 5V (Note 7)
0.2
0.3
l
0.8
Maximum Switch Duty Cycle
FB = 1V or VSENSE = 4.1V
93
96
l 90
Switch Frequency
VC Set to Give DC = 50%
184
200
216
l 135
200
228
UNITS
V
V
μA
V/V
μMho
μMho
A/V
μA
μA
V
V
A
Ω
Ω
%
%
kHz
kHz
1766fc
4
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