LM2576HV データシートの表示（PDF） - Unspecified

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LM2576HV

Simple high-efficiency step-down (buck) regulator

Unspecified 



LM2575HV/LM2576HV/HM2676HV

All Output Voltage Versions

Electrical Characteristics (Continued)

Specifications with standard type face are for TJ = 25C, and those with boldface type apply over full Operating

Temperature Range. Unless otherwise specified, VIN =12V for the 3.3V, 5V, and Adjustable version, VIN =25V for the 12V

version, and VIN =30V for the 15V version, ILOAD =500mA.

Symbol

Parameter

____

ON/OFF CONTROL

VIH

_______

ON/OFF Pin

VIL

Logic Input Level

IIH

_______

ON/OFF Pin Input

Current

IIL

Conditions

LM2575HV/LM2576HV

/HM2676HV

Typ

Limit

(Note 2)

Units

(Limits)

VOUT = 0V

1.4

VOUT = Nominal Output Voltage

1.2

_______

ON/OFF Pin = 5V (OFF)

12

_______

ON/OFF Pin = 0V (ON)

0

2.2/2.4

1.0/0.8

30

10

V(Min)

V(Max)

A

A(Max)

A

A(Max)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings

indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For

guaranteed specifications and test conditions, see the Electrical Characteristics.

Note 2: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face).

Note 3: External components such as the catch diode, inductor, input and output capacitors can affect switching

regulator system performance. When the LM2575HV/LM2576HV/HM2676HV is used as shown in the Figure 2 test

circuit, system performance will be as shown in system parameters section of Electrical Characteristics.

Note 4: Output pin sourcing current. No diode, inductor or capacitor connected to output.

Note 5: Feedback pin removed from output and connected to 0V.

Note 6: Feedback pin removed from output and connected to +12V for the Adjustable, 3.3V, and 5V, versions, and +25V

for the 12V and 15V versions, to force the output transistor OFF.

Note 7: VIN =60V.

Note 8: The oscillator frequency reduces to approximately 11 kHz 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 protections

feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to

approximately 2%.

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