MC44603P Просмотр технического описания (PDF) - ON Semiconductor
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MC44603P 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
SOFT−START SECTION (Note 10)
Duty Cycle (Rsoft−start = 12 kW)
Duty Cycle (Vsoft−start (Pin 11) = 0.1 V)
OVERVOLTAGE SECTION
Dsoft−start 12k
36
42
49
%
Dsoft−start
−
−
0
Protection Threshold Level on VOVP
Propagation Delay (VOVP > 2.58 V to Vout Low)
Protection Level on VCC
TA = 0° to +70°C
TA = −25° to +85°C
Input Resistance
VOVP−th
VCC prot
−
2.42
2.5
1.0
−
16.1
17
15.9
−
2.58
V
3.0
ms
V
17.9
18.1
kW
TA = 0° to +70°C
TA = −25° to +85°C
FOLDBACK SECTION (Note 9)
1.5
2.0
3.0
1.4
−
3.4
Current Sense Voltage Threshold (Vfoldback (Pin 5) = 0.9 V)
Foldback Input Bias Current (Vfoldback (Pin 5) = 0 V)
STANDBY SECTION
VCS−th
0.86
0.89
0.9
V
Ifoldback−lb
−6.0
−2.0
−
mA
Ratio IR P Stby/Iref
TA = 0° to +70°C
TA = −25° to +85°C
Ratio Hysteresis (Vh Required to Return to Normal Operation from
Standby Operation)
IR P Stby/Iref
−
0.37
0.4
0.43
0.36
−
0.44
Vh/VR P Stby
−
TA = 0° to +70°C
TA = −25° to +85°C
Current Sense Voltage Threshold (VR P Stby (Pin 12) = 1.0 V)
CURRENT SENSE SECTION
1.42
1.5
1.58
1.4
−
1.6
VCS−Stby
0.28
0.31
0.34
V
Maximum Current Sense Input Threshold
(Vfeedback (Pin 14) = 2.3 V and Vfoldback (Pin 6) = 1.2 V)
Input Bias Current
Propagation Delay (Current Sense Input to Output at VTH of
MOS transistor = 3.0 V)
VCS−th
ICS−ib
−
0.96
1.0
1.04
V
−10
−2.0
−
mA
−
120
200
ns
TOTAL DEVICE
Power Supply Current
Startup (VCC = 13 V with VCC Increasing)
Operating TA = −25° to +85°C (Note 2)
Power Supply Zener Voltage (ICC = 25 mA)
Thermal Shutdown
ICC
mA
−
0.3
0.45
13
17
20
VZ
18.5
−
−
V
−
−
155
−
°C
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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