TC2575 Просмотр технического описания (PDF) - TelCom Semiconductor Inc => Microchip
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TC2575 Datasheet PDF : 25 Pages
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1.0A Step-Down Switching Regulator
TC2575
ELECTRICAL CHARACTERISTICS: (Unless otherwise specified, VIN = 12V for the 3.3V, 5.0V, and Adjustable
version,VIN = 25V for the 12V version. ILOAD = 200mA. For typical values TJ = 25°C, for min/max values TJ is the operat-
ing junction temperature range that applies (Note 2), unless otherwise noted.
Symbol
Parameter
Test Conditions
Min
Typ
Max
Units
TC2575-ALL OUTPUT VOLTAGE VERSIONS
Ib
fOSC
VSAT
DC
Feedback Bias Current
VOUT = 5.0V (Adjustable Version Only)
nA
TJ = 25°C
—
25
100
TJ = –40°C to +125°C
—
—
200
Oscillator Frequency (Note 3)
TJ = 25°C
TJ = 0 to +125°C
TJ = –40 to +125°C
—
52
—
kHz
47
—
58
42
—
63
Saturation Voltage
IOUT = 1.0A, (Note 4)
TJ = 25°C
TJ = –40 to +125°C
V
—
1.0
1.2
—
—
1.3
Max Duty Cycle (“on”) [Note 5]
94
98
—
%
ICL
Current Limit Peak Current
(Notes 3 and 4)
TJ = 25°C
TJ = –40 to +125°C
A
1.7
2.3
3.0
1.4
—
3.2
IL
Output Leakage Current
(Notes 6 and 7), TJ = 25°C
Output = 0 V
Output = – 1.0 V
mA
—
0.8
2.0
—
6.0
20
IQ
ISTBY
VIH
Quiescent Current (Note 6)
Standby Quiescent Current,
ON/OFF Pin = 5.0 V (“off”)
ON/OFF Pin Logic Input Level
(Test Figure 2)
TJ = 25°C
TJ = –40 to +125°C
TJ = 25°C
TJ = –40 to +125°C
VOUT = 0V
TJ = 25°C
TJ = –40 to +125°C
mA
—
5.0
9.0
—
—
11
µA
—
80
200
—
—
400
V
2.2
1.4
—
2.4
—
—
VIL
Nominal Output Voltage
VOUT = Nominal Output Voltage
V
TJ = 25°C
—
1.2
1.0
TJ = –40 to +125°C
—
—
0.8
IIH
ON/OFF Pin Input Current
µA
(Test Figure 2)
ON/OFF Pin = 5.0V (“off”),
—
15
30
TJ = 25°C
IIL
ON/OFF Pin Input Current
ON/OFF Pin = 0V (“on”),
—
0
5.0
µA
TJ = 25°C
NOTES: 3. The oscillator frequency reduces to approximately 18kHz in the event of an output short or an overload which causes the regulated
output voltage to drop approximately 40% from the nominal output voltage. This self protection feature lowers the average power
dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%.
4. Output (Pin 2) sourcing current. No diode, inductor or capacitor connected to the output pin.
5. Feedback (Pin 4) removed from output and connected to 0V.
6. Feedback (Pin 4) removed from output and connected to +12V for the Adjustable, 3.3V, and 5.0V versions, and 25V for the 12V,
to force the output transistor "OFF".
7. VIN = 40 V.
TC2575-1 3/13/00
3
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