ZSLS7025ZI1R datasheet, PDF - EEWORLD Datasheet

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ZSLS7025ZI1R: DescriptionDRIVER LED BOOST 100VIN 2A; File Size954KB，27 Pages; ManufacturerZentrum Mikroelektronik Dresden AG (IDT)

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ZSLS7025ZI1R Overview

DRIVER LED BOOST 100VIN 2A

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Data Sheet

Rev. 1.00 / June 2012

ZSLS7025

Boost LED Driver

ZSLS7025

Boost LED Driver

Contents

IC Characteristics .......................................................................................................................................................... 6

1.1

1.2

1.3

1.4

2.1

2.2

2.3

2.4

2.5

2.6

Absolute Maximum/Minimum Ratings .................................................................................................................... 6

Operating Conditions ............................................................................................................................................. 6

Electrical Parameters ............................................................................................................................................. 7

Typical Performance Characteristics Graphs ......................................................................................................... 8

ZSLS7025 Overview ............................................................................................................................................ 10

Boost Converter ................................................................................................................................................... 10

Internal 5V Regulator ........................................................................................................................................... 11

Input Current ........................................................................................................................................................ 11

LED Current Control ............................................................................................................................................ 11

Dimming Control .................................................................................................................................................. 11

Dimming Control Using an External DC Control Signal ................................................................................ 12

Dimming Control Using an RC Filter to Convert a PWM Signal to a DC Voltage.......................................... 13

PWM Dimming with a Dimming Control MOSFET (Q

)................................................................................. 14

Circuit Description ....................................................................................................................................................... 10

2.6.1

2.6.2

2.6.3

2.7

2.8

2.9

2.10

3.1

3.2

4.1

4.2

Peak Input Current Control .................................................................................................................................. 14

Setting the Minimum Off-Time t

OFF_MIN

................................................................................................................. 15

Switching Frequency and Inductor Value ............................................................................................................. 15

DC Power Loss .................................................................................................................................................... 16

Under-Voltage Lockout ........................................................................................................................................ 17

Over-Voltage Protection ....................................................................................................................................... 17

Applications.......................................................................................................................................................... 18

External Component Selection............................................................................................................................. 18

Series Resistor R

VDD

..................................................................................................................................... 18

Inductor L

.................................................................................................................................................... 18

High Frequency Noise Filter Capacitor C

VDD

................................................................................................ 19

Input Capacitor C

....................................................................................................................................... 19

Output Capacitor C

OUT

for Reducing Output Ripple ...................................................................................... 19

Schottky Rectifier Diode D

........................................................................................................................... 19

External MOSFET Q

.................................................................................................................................... 19

Operating Conditions ................................................................................................................................................... 17

Application Circuit Design............................................................................................................................................ 18

4.2.1

4.2.2

4.2.3

4.2.4

4.2.5

4.2.6

4.2.7

4.3

4.4

Application Circuit Layout Requirements ............................................................................................................. 20

Application Example ............................................................................................................................................ 20

Selecting R

VDD

, C

, and C

VDD

....................................................................................................................... 21

Selecting R

TOFF

to Set Minimum t

OFF

............................................................................................................. 21

Selecting R

to Set Output Current and C3 ................................................................................................. 21

Selecting R

, R

and C

.......................................................................................................................... 22

for Setting Input Peak Current ............................................................................................................... 23

4.4.1

4.4.2

4.4.3

4.4.4

4.4.5

Data Sheet

June 28, 2012

Zentrum Mikroelektronik Dresden AG

— Rev.1.00

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

4 of 27

ZSLS7025

Boost LED Driver

4.4.6

4.4.7

4.4.8

for Setting the Frequency ......................................................................................................................... 23

and R

for Setting OVP ............................................................................................................................ 24

External MOSFET and D

Diode ............................................................................................................. 24

ESD Protection ............................................................................................................................................................ 25

Pin Configuration and Package ................................................................................................................................... 25

Glossary ...................................................................................................................................................................... 27

Ordering Information ................................................................................................................................................... 27

Document Revision History ......................................................................................................................................... 27

List of Figures

Figure 1.1

Figure 1.2

Figure 1.3

Figure 1.4

Figure 1.5

Figure 1.6

Figure 1.7

Figure 1.8

Figure 2.1

Figure 2.2

Figure 2.3

Figure 2.4

Figure 2.5

Figure 4.1

Figure 4.2

Figure 6.1

Figure 6.2

vs. I

OUT

with V

OUT

= 40V ............................................................................................................................ 8

vs. Efficiency with V

OUT

= 40V ................................................................................................................... 8

OUT

vs. I

OUT

with V

= 12V ............................................................................................................................ 8

OUT

vs. Efficiency with V

= 12V................................................................................................................... 8

vs. I

OUT

with V

OUT

= 48V ............................................................................................................................ 8

vs. Efficiency with V

OUT

= 48V................................................................................................................... 8

OUT

vs. I

OUT

with V

= 24V ............................................................................................................................ 9

OUT

vs. Efficiency with V

= 24V................................................................................................................... 9

Typical ZSLS7025 Circuit Diagram ............................................................................................................... 10

Example Circuit for Controlling Output Current via an External DC Control Voltage .................................... 12

RC Filter PWM Dimming Circuit ................................................................................................................... 13

PWM Dimming Circuit Using a Dimming Control MOSFET (Q

) .................................................................. 14

Minimum Off-Time t

OFF_MIN

vs. R

TOFF

............................................................................................................ 15

Typical ZSLS7025 Application Circuit ........................................................................................................... 18

Application Design Example – RC Filter PWM Dimming Circuit ................................................................... 21

ZSLS7025 Pin Assignments ......................................................................................................................... 25

SOP-8 Package Dimensions and Pin Assignments ...................................................................................... 26

List of Tables

Table 1.1

Table 1.2

Table 1.3

Table 6.1

Absolute Maximum Ratings ............................................................................................................................ 6

Operating Conditions ...................................................................................................................................... 6

Electrical Parameters ..................................................................................................................................... 7

Pin Description SOP-8 .................................................................................................................................. 25

Data Sheet

June 28, 2012

Zentrum Mikroelektronik Dresden AG

— Rev.1.00

the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice.

5 of 27

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