lc5523f Allegro MicroSystems, Inc., lc5523f Datasheet

lc5523f

Manufacturer Part Number

lc5523f

Description

Single-stage Power Factor Corrected Off-line Switching Regulator Ic

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.LC5523F.pdf (14 pages)

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Features and Benefits

• Integrated on-width control circuit (it realizes high power

• Integrated startup circuit (no external startup

• Integrated soft-start circuit (reduces power stress during

• Integrated bias assist circuit (improves the startup

• Integrated Leading Edge Blanking (LEB) circuit

• Integrated maximum on-time limit circuit

• Dual-chip structure, with an avalanche-guaranteed power

• Protection features:

Package: 7-pin TO-220F

48102.004

factor by average current control)

circuit necessary)

start-up on the incorporated power MOSFET and

output diode)

performance, suppresses V

operation, allows reduction of VCC capacitor value as well

as use of a ceramic capacitor)

MOSFET (allows simplified surge suppressing circuits)

▫ Overcurrent protection (OCP): pulse-by-pulse

▫ Overvoltage protection (OVP): pins VCC, OVP, and

▫ Overload protection (OLP): intermittent oscillation

▫ Thermal shutdown (TSD): halts switching operation and

OCP, intermittent oscillation operation

operation

latches in the off-state

LF 3052

(AC)

S/GND

D/ST

voltage droop during

LF 3051

Controller

LC5523F

Chip

OCP

VCC

OVP

LF 3054

Not to scale

Typical Application

PC2

PC1

Single-Stage Power Factor Corrected

Description

The LC5500 series is a quasi-resonant topology switching

power supply IC, designed for input capacitorless applica-

tions, and making it possible for systems to comply with the

harmonics standard (IEC61000-3-2 class C). It incorporates

separate controller and power MOSFET chips. The control-

ler adapts the average current control method for realizing

high power factors, and the quasi-resonant topology contrib-

utes to high efficiency and low EMI noise. The rich set of

protection features helps to realize low component counts,

and high performance-to-cost power supply.

The LC5523F is intended for isolated designs. The incor-

porated MOSFET has a V

power of 60 W on 230 VAC supply and 40 W on universal

supply based on the thermal rating. Note that the maximum

output power can be up to 120% to 140% of this value.

However, it may be limited in applications with low output

voltage or short duty cycle.

DS(on)

Off-Line Switching Regulator IC

(max) of 1.9 Ω. It is capable of a maximum output

PC2

PC1

DSS

(min) rating of 650 V and

–

LC5523F

LED

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