SG6840 查看數據表（PDF） - Unspecified
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SG6840 Datasheet PDF : 11 Pages
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SG6840
Product Specification
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
VDD
DC Supply Voltage – note 1
20
Iout
Gate Output Current
500
VFB
Input Voltage to FB Pin
-0.3 to 7 V
VSense
Input Voltage to Sense Pin
-0.3 to 7V
Pd
Power Dissipation
1
TJ
Operating Junction Temperature
150
TA
Operating Ambient Temperature
Tstg
Storage Temperature Range
-25 to 85
-55 to +150
Note: All voltage values, except differential voltage, are with respect to network ground terminal.
Unit
V
mA
V
V
W
。C
。C
。C
ELECTRCIAL CHARACTERISTICS(VDD=15V, TA=25)
Feedback Input Section
Symbol
Av
Zfb
Ifb
Voz
Parameter
Input-voltage to current-sense attenuation
Input impedance
Bias current
Input voltage for zero duty cycle
Test Condition
Min. Typ. Max. Unit
1/4.5
1/5
1/5.5 V/V
3
4.5
6
KΩ
2
mA
1.2
V
Current Sense Section
Symbol
Parameter
Zcs
Input impedance
TPD
Vth
∆Vth @ Iin
Delay to Output
Threshold voltage for current limit
The change of threshold voltage versus
the input current of the Vin
Test Condition
Iin = 220 uA
Min.
8
0.8
-0.09
Typ.
12
150
0.85
-0.15
Max. Unit
16 KΩ
200 nS
0.9
V
-0.21 V
Oscillator Section
Symbol
Fosc
Fosc-green
Vg
Vn
Sg
Parameter
Frequency
Frequency in green mode
Green mode voltage (Vg = Vfb - Vd)
Normal mode voltage (Vn = Vfb - Vd)
Vn = 4 V for maximum duty cycle
Slope for green mode modulation
Fdv
Frequency variation versus VDD deviation
Fdt
Frequency variation versus Temp. devia-
tion
Test Condition
Ri=26KOhms
Ri=26KOhms
Ri=26KOhms
VDD=10 to 20V
TA=-25 to 85 ℃
Min.
60
1.7
50
Typ.
65
10
1.3
2
80
Max.
70
15
2.3
120
5
5
Unit
KHz
KHz
V
V
Hz/
mV
%
%
2002 System General Corporation
-3-
Ver1.0
http://www.sg.com.tw
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