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LT1681 数据表(PDF) 3 Page - Linear Technology

部件名 LT1681
功能描述  Dual Transistor Synchronous Forward Controller
PDF  20 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1681 数据表(HTML) 3 Page - Linear Technology

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LT1681
1681f
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5V External Reference
V5VREF
5V Reference Voltage
0
≤ (I5VREF – IVC) < 20mA
4.85
5
5.10
V
q
4.80
5.15
V
I5VREFSC
Short-Circuit Current
Source, IVC = 0
q
20
45
mA
R5VREF
Output Impedance
0
≤ (I5VREF – IVC) < 20mA
1
Ω
Error Amp
VFB
Error Amplifier Reference Voltage
Measured at Feedback Pin
1.242
1.250
1.258
V
q
1.225
1.265
V
IFB
Feedback Input Current
VFB = VREF
–50
nA
AV
Error Amplifier Voltage Gain
72
dB
IVC
Error Amplifier Current Limit
Source
q
10
25
mA
Sink
q
0.5
1
mA
VVC
Zero Current Output Voltage
1.4
V
Maximum Output Voltage
3.2
V
GBW
Gain Bandwidth Product
(Note 3)
1
MHz
Current Sense and Blanking
AV
Amplifier DC Gain
12
V/V
ISENSE
Input Bias Current
– 275
µA
VSENSE
Current Limit Threshold
Measured at SENSE Pin
135
150
165
mV
q
130
170
mV
tD
Current Sense to Switch Delay
175
ns
VBLKSENS Blanking Input Threshold
q
4.5
5
5.5
V
IBLKSENS
Blanking Input Bias Current
–2
µA
tMIN
Switch Minimum On Time
VBLKSENS = VBG, Measured at BG Output
250
ns
IMAX Sense
IIMAX
Input Bias Current
– 250
µA
VIMAX
IMAX Threshold (Rising Edge)
Measured at IMAX Input
q
320
360
400
mV
IMAX Threshold Hysteresis
Measured at IMAX Input
140
mV
tP
IMAX Output Switch Disable Delay
Measured at BG Output
130
ns
THERM and OVLO Fault Detectors
VTHERM/
Threshold (Rising Edge)
q
1.2
1.25
1.3
V
VOVLO
Threshold Hysteresis
q
20
40
60
mV
tP
Fault Delay to Output Disable
50mV Overdrive
650
ns
Oscillator and Synchronization Decoder
fOSC
Oscillator Frequency, Free Run
Measured at FSET Pin
700
kHz
Frequency Programming Error, Free Run
fOSC ≤ 500kHz (Note 3)
q
–10
5
%
IFSET
FSET Input Bias Current
FSET Charging, VFSET = 2V
50
nA
VSYNC
SYNC Logic High Input Threshold
Positive-Going Edge
q
1.4
2
V
SYNC Logic Low Input Threshold
Negative-Going Edge
q
0.8
1.4
V
fSYNC
SYNC Frequency
q
fOSC/2
350
kHz
tH, L
Maximum SYNC Pulse Width
fOSC = Oscillator Free-Run Frequency
1/fOSC
s
(Logic High or Logic Low)



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