Micrel KSZ8895 Specifications download pdf (Page 10)

APPLICATION SPOTLIGHT

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Reader Response No.

9-13 volt systems easily adapt to a Smart

Driver Circuit to drive High Power LEDs using

the MCP1702, MCP1652 and a PIC10F202. The

MCP1702 directly connected to the 12 volt

source creates a 5 volt bias supply capable

of delivering 250 mA to the intelligent boost

control circuit.

The LEDs are powered by the source voltage

boosted by the MCP1652, minimizing the

current requirements for the 5V power

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Reader Response No.

HighEfficiencyLEDSmartDriver

system. A PIC10F202 adds intelligence to

the circuit providing a means for thermal

protection, load open and short circuit

protection as well as the capability of a user

interface to control dimming and other

features.

Low Battery Detect enables the designer

to determine a trip point for a low battery

condition to make “smart” adjustments to

the circuit function with the PIC10F202. The

Power Good Indication enables the designer

to determine when output voltage conditions

are correct.

Literature on the Web

• MCP1650/51/52/53 Data Sheet, DS21876

• AN980 – Designing a Boost-Switching

Regulator with the MCP1650, DS00980A

• DG10 – Power Solutions Design Guide,

DS21913B

Microchip

10 LED String

700 mA, 34V DC

PIC10F202

MCP1652

GND

EXT

SHDN

User

Interface

Dimming

Output

Control

MCP1703

5V LDO

9-13V DC

LED Smart Driver with 12V Input

MCP165X Driver Devices

Device Special Features Package

MCP1650 Standard Device 8-Pin MSOP

MCP1651 Low Battery Detect 8-Pin MSOP

MCP1652 Power Good Indication 8-Pin MSOP

MCP1653 Low Battery Detect and

Power Good Indication

10-Pin MSOP

Non-dimming CFL drivers raise performance and reliability

start capability resulting in faster light-output

run-up. Moreover, by incorporating NXP’s

GreenChipTM technology to maximise energy

savings, the drivers also deliver an average 5%

improvement in energy eciency compared

to alternative CFL drivers.

By also implementing current-controlled

preheating alongside the fully integrated

CFLdriving functions, UBA2211 drivers

enable more compact uorescent lamp

designs, highly ecient power conversion,

and extended CFL lifetimes in the range of

12,000 to 15,000 hours. The current-controlled

preheat function satises a key

requirement of the EU directive on

energy-saving lighting, which

eectively bans incandescent

bulbs for ordinary lighting.

There is also a glow-time

control feature, which

allows use in non-preheat

applications by minimising

electrode damage just after

ignition of the lamp.

APPLICATIONS:



Indoor and outdoor non-dimming CFLs up

 to25W

FEATURES:



Integrated bootstrap diode



Integrated high-voltage supply



Lamp power independent from mains

voltage variations



Saturation-current protection



Over-temperature and over-voltage safety

features



System shutdown at CFL end of life

The UBA2211 family from NXP

Semiconductors provides a selection of

highly integrated CFL drivers enabling

improved quality of light at lower cost in

non-dimming applications.

The family of four drivers comprises one

generic device optimised for use with external

switches and compatible with 230V or 110V

mains voltages, as well as the UBA221A,

UBA221B and UBA221C 230V-only devices

for use with 11W, 18W or 23W CFLs

respectively.

The non-generic drivers

provide half-bridge transistors

on-chip and implement RMS-

current control to maintain

constant half-bridge lamp

current and IC dissipation.

Among the key performance benets on

oer, the UBA2211 family provides quick-

NXP

Semiconductors

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Micrel KSZ8895 Specifications Page 10

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