ZXSC310EV Diodes Zetex, ZXSC310EV Datasheet - Page 6

• Manufacturer Part Number: ZXSC310EV
• Description: BOARD EVALUATION FOR ZXSC310E5TA
• Manufacturer: Diodes Zetex

Specifications of ZXSC310EV

• Outputs And Type: 1, Non-Isolated
• Features: Programmable output current
• Voltage - Input: 0.8 ~ 8 V
• Utilized Ic / Part: ZXSC310
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

REFERENCE DESIGNS
Three typical LED driving applications are shown.
Firstly a typical LCD backlight circuit, then maximum
brightness LED driving solution and lastly an optimised
battery life LED driving solution.
LCD backlight circuit
This application shows the ZXSC310 in a typical LCD
backlight application for Digital Still Cameras and
PDA’s. The input voltage for these backlight circuits are
usually fixed from the main system power, typically
3.3V or 5V. The LED’s are connected serially so that the
light is distributed uniformly in each LED. The current
provided to the LED’s can either be pulsed or DC. The
DC current is programmable via a sense resistor,
R
for the reference designs. DC current is achieved by
adding a Schottky rectifying diode and an output
capacitor, as shown in the reference design below.
Materials list
(6)
(7)
(8)
ZXSC310
SENSE
Used for 5V input, I
See Application section.
V
R1
R1
L1
Used for 3.3V input, I
Ref
U1
Q1
D1
C1
S E M I C O N D U C T O R S
IN
(8)
(6)
(7)
= 3.3V / 5V
, and is set to an optimum LED current of 20mA
150m
250m
Value
2.2 F
68µH
N/A
N/A
N/A
V
S
Gnd
TDN
CC
V
I
SENSE
DRIVE
LED
LED
to 20mA
Part Number
ZXSC310E5
ZHCS1000
set to 20mA
FMMT618
Generic
Generic
Generic
10%.
10%.
Zetex Semiconductors
Zetex Semiconductors
Zetex Semiconductors
Manufacture
Various
Various
Various
6
(Notes)
Single cell converter, SOT23-5
1A Schottky diode, SOT23
Low V
Surface mount inductor
CE(sat)
ISSUE 3 - SEPTEMBER 2007
Comments
0805 Size
1206 Size
1206 Size
NPN, SOT23