Fairchild FL7930B, FLS2100XS, FAN7346 service manual

www.fairchildsemi.com

Fairchild Reference Design

The following reference design supports inclusion of FL7930B, FLS1800XS and FAN734 6 in
design of LED illumination. It should be used in conjunction with the FL7930B, FLS1800 XS
and FAN7346 datasheet as well as Fairchild’s application notes and technical support team.
Please visit Fairchild’s website at www.fairchildsemi.com.

Application Fairchild Device Input Voltage

Range

LED Illumination FL7930B,

90 ~ 265V

AC

FLS1800XS

FAN7346

1. Key Features of Main Controller

1.1. FL7930B

 Additional OVP Detection Pin
 Input Voltage Absent Detection Circuit
 Internal Soft-Start without Overshoot
 Internal Total Harmonic Distortion (THD) Optimizer
 Precise Adjustable Output Over-Voltage Protection
 MOSFET Over-Current Protection

1.2. FLS1800XS

 Variable Frequency Control with 50% Duty Cycle High Efficiency thro ugh

Zero Voltage Switching (ZVS)

 Up to 300 KHz Operating Frequency
 Auto-Restart Operation for All Protections with External LV
 Protection Functions: Over-Voltage Protection (OVP), Over-Current

Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal
Thermal Shutdown (TSD)

Rated Output

Power

100W

Output Voltage

(Rated Current)

100V

(4-CH : 250mA/CH)

(1-CH : 1.0A)

CC

1.3. FAN7346

 Linear Balance Control for 4-Channel LED Arrays
 Wide input Voltage Range: 10V to 100V
 Precision Current Accuracy Trimmed to 1.5%
 Support Wide Dimming Ratio: 0.5% ~ 100%
 Protection Functions: Channel Individual Open LED Protection (OLP), Channel

Individual Short LED Protection (SLPR), Channel Individual Over Current
Protection (OCP), Thermal Shutdown Function (Auto-Recovery)

© 2011 Fairchild Semiconductor Corporation 1 RD-L011_FL7930B_FLS1800XS_FAN7346 • Rev. 1.0.1

www.fairchildsemi.com

2. Schematic of the Evaluation Board

2.1 PFC Part

Figure 1. Schematic for PFC part

2.2 DC-DC Converter and Current Balance Controller Part

Figure 2. Schematic for DC-DC Converter and Current Balance Part for Multi Output

© 2011 Fairchild Semiconductor Corporation 2 RD-L011_FL7930B_FLS1800XS_FAN7346 • Rev. 1.0.1

www.fairchildsemi.com

2.3 DC-DC Converter and CC/CV Part

PFC
OUT

R129

R128

R130

R136 R135 R134

PC101

V

AUX

R123

R131 R132

D107

C126

C114

C127

C125

R127

Q104

Q103

U102

RT

AR

CS

R126

C115

SG

LV

U9

V

LED

RS57

CS22

RS59

RS60

C202 C203

R202

RS49

C201

PC101

R203

D204

DS3

DS5

U201

U11

U11

C205C206

CS19 RS33

RS42
RS44
RS46

RS35 RS41

RS40

RS55RS56CS25

TM2

C116

D201

D202

R201

D203

C204

C123

R133

D109

VDL

CC

Series

FLS-XS

HV

CC

C124

VCTR

PG

Figure 3. Schematic for DC-DC Converter and CC/CV part for Single Output

© 2011 Fairchild Semiconductor Corporation 3 RD-L011_FL7930B_FLS1800XS_FAN7346 • Rev. 1.0.1