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KA7552A.. 数据表(PDF) 2 Page - Fairchild Semiconductor

部件名 KA7552A..
功能描述  SMPS Controller
PDF  6 Pages
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制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

KA7552A.. 数据表(HTML) 2 Page - Fairchild Semiconductor

  KA7552A.. Datasheet HTML 1Page - Fairchild Semiconductor KA7552A.. Datasheet HTML 2Page - Fairchild Semiconductor KA7552A.. Datasheet HTML 3Page - Fairchild Semiconductor KA7552A.. Datasheet HTML 4Page - Fairchild Semiconductor KA7552A.. Datasheet HTML 5Page - Fairchild Semiconductor KA7552A.. Datasheet HTML 6Page - Fairchild Semiconductor  
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KA7552A/KA7553A
2
Absolute Maximum Ratings
Electrical Characteristics
(VCC = 18V, FOSC = 135kHz, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Value
Unit
Supply voltage
VCC
30
V
Output current
IO
±1.5
A
Input voltage at overcurrent detection pin
VIN(IS)
-0.3 to 4
V
Input voltage at FB pin
VIN(FB)
4V
Input current at CS pin
IIN(CS)
2mA
Total power dissipation (Ta = 25
°C)
PD
800
mW
Operating temperature
TOPR
-25 to 85
°C
Storage temperature range
TSTG
-65 to 150
°C
Junction temperature
Tj
+125
°C
Parameter
Symbol
Conditions
Min. Typ. Max. Unit
OSCILLATOR SECTION
Initial accuracy
FOSC
CT = 360pF, TJ = 25°C
125
135
145
kHz
Frequency variation 1
∆F/∆VVCC = 10V to 30V
-
±1
±3%
Frequency variation 2(Note1)
∆F/∆VTA = 25°C to 85°C-
±1.5
-
%
Ramp high voltage
VRH
CT = 360pF, TJ = 25°C
2.80 3.08 3.30
V
Ramp low voltage
VRL
CT = 360pF, TJ = 25°C
0.6
0.9
1.2
V
Amplitude
VOSC
VPIN7, peak to peak
1.80 2.18 2.50
V
PULSE WIDTH MODULATION SECTION
Input threshold voltage(pin2)
VTH(FBD)
Duty cycle = 0%
0.6
0.75 0.95
V
Input threshold voltage(pin2)(Note1)
VTH(FB1) (KA7552)
Duty cycle = Dmax 1
2.1
2.3
2.6
V
VTH(FB2) (KA7553)
Duty cycle = Dmax 2
1.6
1.8
2.1
V
Max. duty cycle
D(Max1) (KA7552)
-
66
70
74
%
D(Max2) (KA7553)
-
43
46
49
%
Source current(pin2)
ISOURCE(FB)
VPIN2 = 0V
-660 -800 -960
uA
OVERCURRENT LIMIT SECTION
Input threshold voltage
VTH(IS)
-
0.21 0.24 0.27
V
Source current(pin3)
ISOURCE(IS)
VPIN3 = 0V
-300 -200 -100
uA
Deley time(Note1)
TD
-
-
150
-
ns
SOFT START SECTION
Charging current
ICHG
VPIN8 = 0V
-15
-10
-5
uA
Input threshold voltage(pin8)
VTH(CSO)
-
0.7
0.9
1.1
V
Input threshold voltage(pin8)(Note1)
VTH(CS1) (KA7552)
Duty cycle = Dmax 1
2.2
2.4
2.6
V
VTH(CS2) (KA7553)
Duty cycle = Dmax 2
1.7
1.9
2.1
V
LATCH MODE SHUTDOWN CIRCUIT SECTION
Sink current(pin8)
ISINK(CS)
VPIN8 = 6V, VPIN2 = 1V
25
45
65
uA
Shutdown threshold voltage
VTH(SD,CS)
-
6.7
7.2
7.7
V
OVERLOAD SHUTDOWN SECTION
Shutdown threshold voltage
VTH(SD,FB)
-
2.6
2.8
3.1
V



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