SC4809A Просмотр технического описания (PDF) - Semtech Corporation
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SC4809A Datasheet PDF : 16 Pages
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SC4809A/B/C
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Unless specified: VDD = 12V, CSS =1nF, FOSC = 500kHz, RT = 10K, CT = 100pF, DMAX = 2V, TA = TJ = -40ºC to +105ºC.
Parameter
Test Conditions
Min
Typ
Line Under Voltage Lockout
Start Threshold
Hysteresis
Input Bias Current
RA = 61.9k, RB = 10k
RA = 61.9k, RB = 10k
LUVLO = 3.2V
-3%
3
150
-100
Comparator Section
IFB
Output Off
-100
Comparator Threshold (A, B version)
570
600
Comparator Threshold (C version)
950
1000
OUT Propagation Delay (No Load)
VFB = 0.8V to 1.2V at TR = 10ns
75
Soft Start Section
ISS
Shutdown Threshold (A, B version)
VSS = 0V; -40 °C <Ta +105°C
-2
300
340
Shutdown Threshold (C version)
440
500
Oscillator Section
Frequency range
50
RCT Peak Voltage
3.00
RCT Valley Voltage
0.05
Minimum Duty Cycle Pulse Width
VFB = 2V
50
Maximum Duty Cycle
90
Sync/CLOCK
Clock SYNC Threshold
Positive Edge Triggered
2.1
Minimum Sync Input Pulse Width
Output Section
FSYNC > Fosc
Output VSAT Low
Output VSAT High
Rise Time
Fall Time
IOUT = 1mA
IOUT = 1mA
COUT = 20pF
COUT = 20pF
VREF - 0.5
10
10
Max
-3%
-250
630
1050
100
-8.0
1100
50
500
25
25
Unit
V
mV
nA
nA
mV
mV
ns
µA
mV
mV
kHz
V
V
ns
%
V
ns
mV
V
ns
ns
2005 Semtech Corp.
3
www.semtech.com
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