SG6846B Ver la hoja de datos (PDF) - Fairchild Semiconductor
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SG6846B Datasheet PDF : 15 Pages
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Electrical Characteristics
VDD = 15V and TA = 25°C unless otherwise noted.
Symbol
Parameter
Test Condition Min. Typ. Max. Unit
VDD Section
VDD-OP Continuously Operating Voltage
VDD-ON Turn-on Threshold Voltage
VDD-OFF Turn-off Voltage
20
V
15.5 16.5 17.5 V
9.5 10.5 11.5 V
VDD-SCP
Threshold Voltage on VDD for Short-Circuit
Protection
VDD-OFF VDD-OFF VDD-OFF
+0.5V +1.0V +1.5V
V
VDD-LH
IDD-ST
IDD-OP
VDD-OVP
Threshold Voltage for Latch-off Release
Startup Current
Operating Supply Current
VDD Over-Voltage Protection (Latch off)
VDD-ON – 0.16V
GATE Open
3
4
5
V
8
30 µA
3.7
5.0 mA
23
24
25
V
tD-VDDOVP
IDD-OVP
VDD OVP Debounce Time
VDD OVP Latch-off Holding Current
RI = 26kΩ
VDD = 5V
150
µs
30
50
70 µA
VIN Section
VIN-OFF PWM Turn-off Threshold Voltage
0.65 0.70 0.75 V
VIN-ON PWM Turn-on Threshold Voltage
VIN-OFF VIN-OFF VIN-OFF
+0.18 +0.20 +0.22
V
Feedback Input Section
AV
Input-Voltage to Current-Sense Attenuation
ZFB
Input Impedance
1/3.5 1/4.0 1/4.5 V/V
4.0
5.5
7.0 kΩ
VFBO
FB Pin Open Voltage
5.2
6.2
6.6
V
Current Sense Section
ZSENSE
tPD
Input Impedance
Delay to Output
12
kΩ
100 250 ns
tLEB
VSLOPE
VSTH1V
VSTH3V
VSTH1V-2/3
Leading-edge Blanking Time
Slope Compensation
Threshold Voltage for Current Limit
Threshold Voltage for Current Limit
OCP Threshold Voltage for Current Limit
Duty = DCYMAX
VIN = 1V
VIN = 3V
VIN = 1V
270 360
ns
0.30 0.33 0.36 V
0.80 0.83 0.86 V
0.67 0.70 0.73 V
0.58 0.61 0.64 V
VSTH3V-2/3 OCP Threshold Voltage for Current Limit VIN = 3V
0.48 0.51 0.54 V
tD-OCP Delay Time for Over-Current Protection
RI = 26kΩ
175 200 225 ms
tD-Short
Output Short Circuit Protection delay time
VCS > VSTH, RI = 26kΩ,
VDD < VDD-SCP
6
7
8
ms
tSS-65KHz
tSS-130KHz
Period During Soft Start Time
RI = 26kΩ
RI = 13kΩ
4.5
5.0
5.5 ms
2.25 2.50 2.75 ms
Continued on following page…
© 2008 Fairchild Semiconductor Corporation
SG6846B • Rev. 1.3.3
6
www.fairchildsemi.com
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