ST735TCD datasheet(3/11 Pages) STMICROELECTRONICS

Il numero della parte	ST735TCD

Spiegazioni elettronici	300kHz, -5V/ADJ INVERTING, NEGATIVE OUTPUT CURRENT-MODE PWM REGULATOR

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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3 / 11 page

ST735S/ST735T

3/11

ORDERING CODES

TYPICAL APPLICATION CIRCUIT

NOTE:

1) All capacitors are X7R ceramic

2) C5 can be omitted if are used higher values for the input and output capacitors (suggested C2=47µF, C1=100µF).

3) R1 and R2 must be placed is ST735T applications only. Their values are calculated by the following formula R2=(|VOUT|/VREF)xR1.For R1

can be chosen any value between 2k

Ω and 20kΩ

APPLICATION CIRCUIT

To achieve the best performances from switching

power supply topology, particular care to layout

drawing is needed, in order to minimize EMI and

obtain low noise. Moreover, jitter free operation

ensures the full device functionality. Layout design

proposed on demoboard helps to lower the

developing time. Wire lengths must be minimized,

filter and bypass capacitors must be low ESR

type, placed as close as possible to the integrated

circuit. The 4.7

µF (or 6.8µF) inductor must be

chosen built on a core, taking care that saturation

current should be higher than the peak LX switch

current. See the Peak Inductor Current vs Output

Current graph.

PRINTED DEMOBOARD (not in scale)

TYPE

DIP-8

SO-8

SO-8 (T&R)

ST735S

ST735SCN

ST735SCD

ST735SCD-TR

ST735T

ST735TCN

ST735TCD

ST735TCD-TR

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