Cirrus-logic AN349 Bedienungsanleitung PDF herunterladen (Seite 9)

AN349

AN349REV1 9

6. Migrating an Existing Design to Use the CS1601

6.1 Footprint Compatibility

The CS1601 is packaged in the industry-standard 8-pin SOIC and is footprint-compatible with the L6562. Figure 11 shows the

Pin assignments of the CS1601 and the L6562. Figure 12 shows the typical PFC section on the ballast using the L6562. Figure

13 shows the typical PFC section of the ballast using the CS1601. In both schematics, the V

generation is not demonstrated.

It will be discussed in a separate section.

Although the CS1601 is footprint compatible with the L6562, it is not a direct drop-in-replacement. Changes to the L6562 system

BOM are necessary as shown in Figure 13.

Figure 11. Pin Assignments for CS1601 and L6562

6.2 BOM Changes Necessary to use CS1601

The following is a typical connection diagram for a ballast using the L6562.

Figure 12. PFC Schematic Of Benchmark Ballast Using L6562

CSPFC Current Sense

IFBLink Voltage Sense

ZCD PFC Zero-current Detect

GND

Ground

GD P FC Gate Dr iv er

VDD IC Supply Voltage

STBYStandby

IA CRectifier V oltage Sense

CS1601

CSInput to PWM Comparator

IN VInverting Input of Error Amplifier

ZCD Demag. Sensing Input

GND

Ground

GD Gate Driver Ouput

VCC IC Supply Voltage

COMPOutput of Error Amplifier

MULTMain Input to Multiplier

L6562

1.5M 

1.5M

68K

0. 8 2 

0. 6 W

750K 

R10

750K

0.47uF

400V

100 uF

Regulated

DC Output

Mains

BR1

L6562

ZCD

INV

GND

CSMULT

VDD

R11

9.53K

2.2 uF

12K 

22K 

100nF

680 nF

4.7uF

0.82 

0.6 W

COMP

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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