KA2S0680 Просмотр технического описания (PDF) - Fairchild Semiconductor
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KA2S0680 Datasheet PDF : 8 Pages
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KA2S0680
SPS
ELECTRICAL CHARACTERISTICS (Control part)
(Ta=25°C unless otherwise specified)
Characteristic
Symbol
Test condition
Min. Typ.
REFERENCE SECTION
Output voltage (1)
Temperature Stability (1)(2)
Vref
Vref/∆T
Ta=25°C
−25°C≤Ta≤+85°C
4.80 5.00
−
0.3
OSCILLATOR SECTION
Initial accuracy
Frequency change with temperature (2)
Sync threshold voltage (3)
PWM SECTION
FOSC
∆F/∆T
VSYTH
Ta=25°C
−25°C≤Ta≤+85°C
Vfb=5V
18 20
−
±5
6.0 6.4
Maximum duty cycle
Dmax
−
92 95
FEEDBACK SECTION
Feedback source current
Shutdown delay current
IFB
Idelay
OVER CURRENT PROTECTION SECTION
Ta=25°C, Vfb=GND
Ta=25°C, 5V≤Vfb≤VSD
0.7 0.9
1.4 1.8
Over current protection
UVLO SECTION
IL(max) Max. inductor current
3.52 4.00
Start threshold voltage
Vth(H)
−
14 15
Minimum operating voltage
Vth(L)
After turn on
9
10
TOTAL STANDBY CURRENT SECTION
Start current
Operating supply current
(control part only)
IST
IOPR
VCC=14V
Ta=25°C
0.1 0.3
6
12
VCC zener voltage
SHUTDOWN SECTION
VZ
ICC=20mA
30 32.5
Shutdown Feedback voltage
Thermal shutdown temperature (Tj) (1)
Over voltage protection voltage
SOFT START SECTION
VSD
TSD
VOVP
−
6.9 7.5
−
140 160
−
23 25
Soft start current
ISS
Sync & S/S=GND
0.8 1.0
Soft start voltage
VSS
VFB=2V
4.7 5.0
NOTES:
1. These parameters, although guaranteed, are not 100% tested in production
2. These parameters, although guaranteed, are tested in EDS (wafer test) process
3. The amplitude of the sync. pulse is recommended to be between 2V and 3V for stable sync. function.
Max. Unit
5.20 V
0.6 mV/°C
22 kHz
±10
%
6.8
V
98
%
1.1 mA
2.2 µA
4.48 A
16
V
11
V
0.55 mA
18 mA
35
V
8.1
V
−
°C
28
V
1.2 mA
5.3
V
4
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