EL7558D Просмотр технического описания (PDF) - Intersil

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EL7558D

Integrated Adjustable 8 Amp Synchronous Switcher

Intersil 

EL7558D

Pin Descriptions (Continued)

I = INPUT, O = OUTPUT, S = SUPPLY

PIN NUMBER

21

22

23

24

25

26

27

28

PIN NAME

LX

LX

LX

VHI

VSS

C2V

CP

FB2

PIN

TYPE

O

O

O

I

S

I

O

I

FUNCTION

Same as pin 20.

Same as pin 20.

Same as pin 20.

Gate drive to high-side driver. Bootstrapped from LX with a 0.1µF capacitor.

Ground return for the control circuitry.

Connected to voltage doubler output. Supplies gate drive to the low-side driver.

Drives the negative side of charge pump capacitor at one-half the oscillator frequency FOSC.

Voltage feedback pin. Active when VCC2DET is logic 1. Internally preset to VOUT = 3.5V.

Block Diagram

FB1, Pin1

FB2, Pin 28

VCCDET, Pin 13

CSLOPE, Pin 3

CREF, Pin 27

1.26V

2-1 MUX

OUTEN, Pin 14

VDD

COSC, Pin 4

4V

UVLO

-

S

+

-

R

+

-

+

-

+

-

+

Current Sense

-

+

Σ Current Limit

-

-

+

+ PWM

VDD

RSS

CSS

V2X

LEB TDELAY

Q

R

Q

S

FF

R

S

Zero Cross Detect

Over Temp Sensor

PWRGD, Pin 16

CP, Pin 27

C2V, Pin 26

VHI, Pin 24

VDD and VIN,

Pin 5,6,8

LX, Pin 20-23

VSSP, Pin 9-

12, 18-19

OT, Pin 15

VSS, Pin 25

8

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