LTC3783EDHDTR 查看數據表（PDF） - Linear Technology
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LTC3783EDHDTR Datasheet PDF : 24 Pages
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LTC3783
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VIN = 12V, VRUN = 1.5V, VSYNC = 0V, VFBP = VREF, RT = 20k, unless otherwise specified.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
IRUN
RUN Pin Input Current
VSENSE(MAX) Maximum Current Sense Threshold
ISENSE(ON) SENSE Pin Current (GATE High)
ISENSE(OFF) SENSE Pin Current (GATE Low)
ISS
Soft-Start Pin Output Current
Voltage/Temperature Reference
VSENSE = 0V
VSENSE = 36V
VSS = 0V
5
125
150 180
70
0.2
–50
VREF
Reference Voltage
1.218 1.230 1.242
● 1.212
1.248
IREF
Max Reference Pin Output Current
∆VREF/∆VIN Reference Voltage Line Regulation
∆VREF/∆IREF Reference Voltage Load Regulation
TMAX
Overtemperature SD Threshold
Rising
3V ≤ VIN ≤ 36V
0mA ≤ IREF ≤ 0.5mA
0.5
0.002 0.02
0.2 1.0
165
THYST
Overtemperature Hysteresis
25
Error Amplifier
IOV/FB
∆VOV/FB(OV)
VOV/FB(FB)
IFBP, IFBN
VFBP – VFBN
gm
AVOL
Oscillator
OV/FB Pin Input Current
OV/FB Overvoltage Lockout Threshold VOV/FB(OV) – VOV/FB(NOM) in %, VFBP ≤ VREF
OV/FB Pin Regulation Voltage
2.5V < VFBP < 36V
Error Amplifier Input Current
0V ≤ VFBP ≤ VREF
2.5V < VFBP < 36V
Error Amplifier Offset Voltage
(Note 5)
0V ≤ VFBP ≤ VREF
2.5V < VFBP ≤ 36V (VILIM = VREF)
2.5V < VFBP ≤ 36V (VILIM = 0.123V)
Error Amplifier Transconductance
VFBP ≤ VREF
2.5V < VFBP < 36V
Error Amplifier Open-Loop Gain
1.212
–3
500
18
7
1.230
– 0.4
50
100
10
1.7
14
60
1.248
3
fOSC
Oscillator Frequency
Oscillator Frequency Range
RFREQ = 20kΩ
250 300 350
20
1000
DMAX
fSYNC/fOSC
tSYNC(MIN)
tSYNC(MAX)
VIH(SYNC)
VHYST(SYNC)
RSYNC
tON(MIN)
Maximum Duty Cycle
Recommended Max SYNC Freq Ratio
SYNC Minimum Input Pulse Width
SYNC Maximum Input Pulse Width
SYNC Input Voltage High Level
SYNC Input Voltage Hysteresis
SYNC Input Pull-Down Resistance
Minimum On-time
fOSC = 300kHz (Note 6)
VSYNC = 0V to 5V
VSYNC = 0V to 5V
With Sense Resistor, 10mV Overdrive
No RSENSE Mode
85
90 97
1.25 1.3
25
0.8/fOSC
1.2
0.5
100
170
300
UNITS
nA
mV
µA
µA
µA
V
V
mA
%/V
%/mA
°C
°C
nA
%
V
µA
µA
mV
mV
mV
mmho
mmho
V/V
kHz
kHz
%
ns
ns
V
V
kΩ
ns
ns
3783f
3
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