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SG6846ALSY Datasheet(PDF) 8 Page - Fairchild Semiconductor

Part # SG6846ALSY
Description  Highly Integrated Green-Mode PWM Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

SG6846ALSY Datasheet(HTML) 8 Page - Fairchild Semiconductor

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© 2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
SG6846A • Rev. 1.1.4
8
65KHz
22.5KHz
V
V
FB-N
FB-G
FB
V
Frequency
PWM
Frequency
+4.2KHz
-4.2KHz
+1.45KHz
-1. 45KHz
Figure 7. PWM Frequency
Electrical Characteristics (Continued)
VDD = 15V and TA = 25°C unless otherwise noted.
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
PWM Output Section
DCYMAX
Maximum Duty Cycle
80
85
90
%
VOL
Output Voltage Low
VDD = 15V, IO = 50mA
1.5
V
VOH
Output Voltage High
VDD = 12V, IO = 50mA
8
V
tR
Rising Time
GATE = 1nF
350
ns
tF
Falling Time
GATE = 1nF
50
ns
VCLAMP
Gate Output Clamping Voltage
VDD = 20V
18
V
Over-Temperature Protection (OTP) Section
(1)
IRT
Output Current of RT Pin
RI = 26kΩ
64
70
76
µA
VRTTH
Threshold Voltage for OTP
1.015
1.065
1.115
V
tDOTP-LATCH
Over-Temperature Latch-off Debounce
RI = 26kΩ
100
ms
RRT-OFF
Equivalent Impedance of RT for OTP
(1)
RI = 26kΩ
14
15
16
kΩ
RI Section
RINOR
RI Operating Range
13
36
kΩ
RIMAX
Maximum RI Value for Protection
10
MΩ
RIMIN
Minimum RI Value for Protection
6
kΩ
Note:
1.
The relationship between RRT-OFF and RI is:
))
(K
R
/
26
A
(70
/
V
I
/
V
R
I
RT
RT
OFF
-
LATCH
-
OTP
OFF
-
RT
Ω
×
=
=
μ
(1)


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