LT1680 Ver la hoja de datos (PDF) - Linear Technology
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LT1680 Datasheet PDF : 16 Pages
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LT1680
ELECTRICAL CHARACTERISTICS
12VIN = 12V, VVC = 2V, VFB = VREF = 1.25V, CGATE = 3000pF, TA = 25°C unless otherwise noted.
SYMBOL PARAMETER
Error Amplifier
VSENSE
Peak Current Limit Threshold
Average Current Limit Threshold
VIAVG
Average Current Limit Threshold
Current Sense Amplifier
AV
Amplifier DC Gain
VOS
Amplifier Input Offset Voltage
IBIAS
Input Bias Current
Oscillator
fO
Operating Frequency, Free Run
Frequency Programming Error
ICT
Timing Capacitor Discharge Current
VSYNC
SYNC Input Threshold
fSYNC
SYNC Frequency Range
Output Drivers
VGATE
Undervoltage Output Clamp
Standby Mode Output Clamp
Gate Output On Voltage
Gate Output Off Voltage
tGATER
tGATEF
Gate Output Rise Time
Gate Output Fall Time
CONDITIONS
Measured at Sense Inputs
Measured at Sense Inputs, VCMSENSE = 10V
Measured at IAVG Pin
Measured at IAVG Pin
2V < VCMSENSE < 60V,
SENSE+ – SENSE– = 5mV
Sink (VCMSENSE > 5V)
Source (VCMSENSE = 0V)
fO ≤ 200kHz, RCT = 16.9k, CCT = 1000pF
LT1680C
LT1680I
Rising Edge
fSYNC ≤ 200kHz
12VIN ≤ 8.2V
VRUN < 0.5V
MIN TYP MAX
UNITS
q 170
190
mV
q 110
120
130
mV
2.5
V
15
V/V
q 0.1
mV
q
45
75
µA
q
700 1200
µA
q
q –5
200
kHz
5
%
q 2.20
2.5
2.75
mA
q 2.10
2.5
2.75
mA
q 0.8
2.0
V
q
fO
1.4fO
q
0.4
0.7
V
q
0.1
V
q 11
11.9
12
V
q
0.4
0.7
V
q
60
200
ns
q
60
140
ns
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2: Supply current specification does not include external FET gate
charge currents. Actual supply currents will be higher and vary with
operating frequency, operating voltages and the type of external FETs used.
See Applications Information.
3
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