ZXSC310EV Diodes Zetex, ZXSC310EV Datasheet - Page 5
![BOARD EVALUATION FOR ZXSC310E5TA](/photos/9/27/92789/zxsc310ev_sml.jpg)
ZXSC310EV
Manufacturer Part Number
ZXSC310EV
Description
BOARD EVALUATION FOR ZXSC310E5TA
Manufacturer
Diodes Zetex
Datasheet
1.ZXSC310E5TA.pdf
(16 pages)
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
DEVICE DESCRIPTION
The ZXSC310 is PFM, controller IC which, when
combined with a high performance external transistor,
enables the production of a high efficiency boost
converter for LED driving applications. A block diagram
is shown for the ZXSC310 below.
The on chip comparator forces the driver circuit and
therefore the external switching transistor off if the
voltage at I
circuit and divider set this threshold.
The voltage at I
resistor connected in series with the emitter of the
switching transistor. A monostable following the
output of the comparator forces the turn-off time of the
output stage to be typically 1.7us. This ensures that
there is sufficient time to discharge the inductor coil
before the next on period.
ISSUE 3 - SEPTEMBER 2007
ZXSC310 Block Diagram
SENSE
SENSE
exceeds 19mV. An internal reference
is taken from a current sense
V
RE
G
V
ND
CC
I
2
R1
R2
5
With every on pulse the switching transistor is kept on
until the voltage across the current-sense resistor
exceeds the threshold of the I
length, and therefore the switching frequency, is
determined by the programmed peak current, the input
voltage and the input to output voltage differential. See
applications section for details.
The driver circuit supplies the external switching
transistor with a fixed drive current. To maximise
efficiency the external transistor switched quickly,
typically being forced off within 30ns.
Drive
I
V
S
I
SENSE
DRIVE
SENSE
TDN
S E M I C O N D U C T O R S
input. The on-pulse
ZXSC310