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PDF ZXSC310 Data sheet ( Hoja de datos )

Número de pieza ZXSC310
Descripción LED DRIVER SOLUTION FOR LCD BACKLIGHTING
Fabricantes Zetex Semiconductors 
Logotipo Zetex Semiconductors Logotipo



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No Preview Available ! ZXSC310 Hoja de datos, Descripción, Manual

LED DRIVER SOLUTION FOR LCD BACKLIGHTING
ZXSC310
DEVICE DESCRIPTION
The ZXSC310 is a single or multi cell LED driver
designed for LCD backlighting applications. The input
voltage range of the device is between 0.8V and 8V.
This means the ZXSC310 is compatible with single
NiMH, NiCd or Alkaline cells, as well as multi-cell or
LiIon batteries.
The device features a shutdown control, resulting in a
standby current less than 5µA, and an output capable
of driving serial or parallel LED’s. The circuit generates
constant power output, which are ideal for driving
single or multiple LED’s over a wide range of operating
voltages. These features make the device ideal for
driving LED’s particularly in LCD backlight applications
for Digital Still cameras and PDA’s.
The ZXSC310 is a PFM DC-DC controller IC that drives
an external Zetex switching transistor with a very low
saturation resistance. These transistors are the best
switching devices available for this type of conversion
enabling high efficiency conversion with low input
voltages. The drive output of the ZXSC310 LED driver
generates a dynamic drive signal for the switching
transistor.
The circuit can start up under full load and operates
down to an input voltage of 0.8 volts. The solution
configuration ensures optimum efficiency over a wider
range of load currents; several circuit configurations
are possible depending on battery life versus
brightness considerations.
FEATURES
· 94% efficiency
· Minimum operating input voltage 0.8V
· Maximum operating input voltage 8V
· Standby current less than 5µA
· Programmable output current
· Series or parallel LED configuration
· Low saturation voltage switching transistor
· SOT23-5 package
The ZXSC310 is offered in the SOT23-5 package which,
when combined with a SOT23 switching transistor,
generates a high efficiency small size circuit solution.
The IC and discrete combination offers the ultimate
cost Vs performance solution for LED backlight
applications.
TYPICAL APPLICATIONS CIRCUIT
APPLICATIONS
· LCD backlights:
Digital still camera
PDA
Mobile phone
· LED flashlights and torches
· White LED driving
· Multiple LED driving
VIN = 3.3V / 5V
V CC
VDRIVE
STDN
I SENSE
Gnd
ORDERING INFORMATION
DEVICE
REEL
SIZE
TAPE
WIDTH
ZXSC310E5 180mm
8mm
QUANTITY
PER REEL
3000
DEVICE MARKINGS
· C310
PROVISIONAL ISSUE A - SEPTEMBER 2001
1

1 page




ZXSC310 pdf
ZXSC310
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 ISENSE exceeds 19mV. An internal reference
circuit and divider set this threshold.
The voltage at ISENSE is taken from a current sense
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.
With every on pulse the switching transistor is kept on
until the voltage across the current-sense resistor
exceeds the threshold of the ISENSE input. The on-pulse
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.
VCC
I
2
R1
VRE
R2
STDN
Drive
I VDRIVE
GND
ZXSC310 Block Diagram
PROVISIONAL ISSUE A - SEPTEMBER 2001
5
ISENSE

5 Page





ZXSC310 arduino
ZXSC310
Output Power Calculation
By making the above assumptions for inductance and
peak current the output power can be determined by:
TOFF
POUT = (VOUT VIN) × IAV × TON + TOFF
Note:VOUT=output voltage + Schottky rectifier voltage
drop.
Where
Capacitor selection
For pulsed operation, as in the maximum battery life
solution, no capacitors are required at the output to the
LED. For rectified operation, as in the maximum
brightness solution, a small value ceramic capacitor is
required, typically 2.2uF.
Generally an input capacitor is not required, but a small
ceramic capacitor may be added to aid EMC, typically
470nF to 1uF.
(notes)
TOFF 1.7us (internally set by ZXSC310)
and
TOFF(VOUT VIN)
TON =
VIN
and
IPK + IMIN
IAV = 2
Where
(VOUT VIN) × TOFF
IMIN = IPK
L
Operating frequency can be derived by:
1
F = (TON + TOFF)
PROVISIONAL ISSUE A - SEPTEMBER 2001
11

11 Page







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