TC2575-12.0VAT 参数 Datasheet PDF下载

1.0A Step-Down Switching Regulator

TC2575

ELECTRICAL CHARACTERISTICS:

(Unless otherwise specified, V

IN

= 12V for the 3.3V, 5.0V, and Adjustable

version,V

IN

= 25V for the 12V version. I

LOAD

= 200mA. For typical values T

J

= 25°C, for min/max values T

J

is the operat-

ing junction temperature range that applies (Note 2), unless otherwise noted.

Symbol

I

b

Parameter

Feedback Bias Current

Test Conditions

Min

Typ

Max

Units

nA

TC2575-ALL OUTPUT VOLTAGE VERSIONS

V

OUT

= 5.0V (Adjustable Version Only)

T

J

= 25°C

T

J

= –40°C to +125°C

Oscillator Frequency (Note 3)

T

J

= 25°C

T

J

= 0 to +125°C

T

J

= –40 to +125°C

Saturation Voltage

I

OUT

= 1.0A, (Note 4)

T

J

= 25°C

T

J

= –40 to +125°C

Max Duty Cycle (“on”) [Note 5]

Current Limit Peak Current

(Notes 3 and 4)

T

J

= 25°C

T

J

= –40 to +125°C

Output Leakage Current

(Notes 6 and 7), T

J

= 25°C

Output = 0 V

Output = – 1.0 V

Quiescent Current (Note 6)

T

J

= 25°C

T

J

= –40 to +125°C

Standby Quiescent Current,

ON/OFF Pin = 5.0 V (“off”)

T

J

= 25°C

T

J

= –40 to +125°C

ON/OFF Pin Logic Input Level

(Test Figure 2)

V

OUT

= 0V

T

J

= 25°C

T

J

= –40 to +125°C

Nominal Output Voltage

V

OUT

= Nominal Output Voltage

T

J

= 25°C

T

J

= –40 to +125°C

ON/OFF Pin Input Current

(Test Figure 2)

ON/OFF Pin = 5.0V (“off”),

T

J

= 25°C

ON/OFF Pin Input Current

ON/OFF Pin = 0V (“on”),

T

J

= 25°C

—

—

—

47

42

—

—

94

1.7

1.4

—

—

—

—

—

—

25

—

52

—

—

1.0

—

98

2.3

—

0.8

6.0

5.0

—

80

—

100

200

—

58

63

1.2

1.3

—

3.0

3.2

mA

2.0

20

mA

9.0

11

µA

200

400

V

2.2

2.4

—

—

—

—

1.4

—

1.2

—

15

0

—

—

V

1.0

0.8

µA

30

5.0

µA

f

OSC

kHz

V

SAT

V

DC

I

CL

%

A

I

L

I

Q

I

STBY

V

IH

V

IL

I

IH

I

IL

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. V

IN

= 40 V.

TC2575-1 3/13/00

3