MC44603A 데이터 시트보기 (PDF) - ON Semiconductor
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MC44603A Datasheet PDF : 22 Pages
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MC44603A
ELECTRICAL CHARACTERISTICS (continued) (VCC and VC = 12 V, (Note 2), Rref = 10 kW, CT = 820 pF, for typical values TA =
25°C, for min/max values TA = −25° to +85°C (Note 3), unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR AND SYNCHRONIZATION SECTION
Oscillator Voltage Swing (Peak−to−Peak)
Ratio Charge Current/Reference Current
TA = 0° to +70°C (VCT = 2.0 V)
TA = −25° to +85°C
Fixed Maximum Duty Cycle = Idischarge/(Idischarge + Icharge)
Ratio Standby Discharge Current versus IR F Stby (Note 5)
TA = 0° to +70°C
TA = −25° to +85°C (Note 8)
VR F Stby (IR F Stby = 100 mA)
Frequency in Standby Mode (RF Stby (Pin 15) = 25 kW)
Current Range
Synchronization Input Threshold Voltage (Note 6)
VOSC(pp)
1.65
1.8
1.95
V
Icharge/Iref
−
0.375
0.4
0.425
0.37
−
0.43
D
78
80
82
%
Idisch−Stby/
−
IR F Stby
0.46
0.53
0.6
0.43
−
0.63
VR F Stby
2.4
2.5
FStby
18
21
IR F Stby
−200
−
VinthH
VinthL
3.2
3.7
0.45
0.7
2.6
V
24
kHz
−50
mA
4.3
V
0.9
Synchronization Input Current
Minimum Synchronization Pulse Width (Note 7)
UNDERVOLTAGE LOCKOUT SECTION
ISync−in
−5.0
−
tSync
−
−
0
mA
0.5
ms
Startup Threshold
Output Disable Voltage After Threshold Turn−On (UVLO 1)
TA = 0° to +70°C
TA = −25° to +85°C
Reference Disable Voltage After Threshold Turn−On (UVLO 2)
DEMAGNETIZATION DETECTION SECTION (Note 8)
Vstup−th
13.6
14.5
15.4
V
Vdisable1
V
8.6
9.0
9.4
8.3
−
9.6
Vdisable2
7.0
7.5
8.0
V
Demagnetization Detect Input
Demagnetization Comparator Threshold (VPin 9 Decreasing)
Propagation Delay (Input to Output, Low to High)
Vdemag−th
50
65
80
mV
−
−
0.25
−
ms
Input Bias Current (Vdemag = 65 mV)
Negative Clamp Level (Idemag = −2.0 mA)
Positive Clamp Level (Idemag = 2.0 mA)
SOFT−START SECTION (Note 10)
Idemag−lb
−0.5
−
−
mA
CL(neg)
−
−0.38
−
V
CL(pos)
−
0.72
−
V
Ratio Charge Current/Iref
Iss(ch)/Iref
−
TA = 0° to +70°C
0.37
0.4
0.43
TA = −25° to +85°C
0.36
−
0.44
Discharge Current (Vsoft−start = 1.0 V)
Idischarge
1.5
5.0
−
mA
Clamp Level
Vss(CL)
2.2
2.4
2.6
V
2. Adjust VCC above the startup threshold before setting to 12 V.
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
4. VC must be greater than 5.0 V.
5. Standby is disabled for VR P Stby < 25 mV typical.
6. If not used, Synchronization input must be connected to Ground.
7. Synchronization Pulse Width must be shorter than tOSC = 1/fOSC.
8. This function can be inhibited by connecting Pin 8 to GND. This allows a continuous current mode operation.
9. This function can be inhibited by connecting Pin 5 to VCC.
10. The MC44603A can be shut down by connecting the Soft−Start pin (Pin 11) to Ground.
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