LM2594 Просмотр технического описания (PDF) - ON Semiconductor

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LM2594

0.5 A, Step-Down Switching Regulator

ON Semiconductor 

12 V

Unregulated

DC Input

CIN = 68 mF

+VIN

7

LM2594

LM2594

5

6

ON/OFF

GND

Feedback

4

Output

8

L1

100 mH

D1

1N5817

R1 = 1 kW

CFF

R2 = 3k

COUT

220 mF

VOUT = 5 V; Iload = 0.5 A

Figure 1. Typical Application

0.5

Figure 2. Representative Block Diagram

PIN FUNCTION DESCRIPTION

Pin No. Symbol

Description (Refer to Figure 1)

1−3

NC

Not Connected

4

FB

This pin is the direct input of the error amplifier and the resistor network R2, R1 is connected externally to

allow programming of the output voltage.

5

ON/OFF Allows the switching regulator circuit to be shut down using logic levels, thus dropping the total input supply

current to approximately 50 mA. The threshold voltage is typical. 1.6 V. Applying a voltage above this value

(up to VIN) shuts the regulator off. If the voltage applied to this pin is lower than 1.6 V or if this pin is left open,

the regulator will be in the “on” condition.

6

GND Circuit ground pin. See the information about the printed circuit board layout.

7

+VIN

Positive input supply for LM2594 step−down switching regulator. In order to minimize voltage transients and

to supply the switching currents needed by the regulator, a suitable input bypass capacitor must be present

(CIN in Figure 1)

8

OUTPUT Emitter of the internal switch. The saturation voltage Vsat of the output switch is typically 1 V. It should be

kept in mind that PCB area connected to this pin should be kept to a minimum in order to minimize coupling

to sensitive circuitry

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