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SN3340 Datasheet Preview

SN3340 Datasheet

350mA LED driver

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SN3340
18V LED driver with internal switch
General Description
The SN3340 is a continuous mode inductive step-down
converter, designed for driving a single LED or multiple
series connected LEDs efficiently from a voltage source
higher than the required LED voltage. The chip operates
from an input supply between 6V and 18V and provides an
externally adjustable output current of up to 750mA.
Depending upon supply voltage and external components,
this can provide up to 12 watts of output power.
The SN3340 includes an integrated switch and a high-side
output current sensing circuit, which uses an external
resistor to set the nominal average output current.
Output current can be adjusted linearly by applying an
external control signal to the ADJ pin. The ADJ pin will
accept either a DC voltage or a PWM waveform. This will
provide either a continuous or a gated output current.
Applying a voltage of 0.2V or lower to the ADJ pin turns
the output off and switches the chip into a low current
standby state.
The chip is assembled in SOT23-5 and SOT89-5 package.
SOT23-5 is available for 350mA output current application;
SOT89-5 is available for 700mA output current application.
Application Circuit
Features
z Simple low parts count
z input voltage range: 6V to 18V 30V transient
capability
z Internal 18V power switch
z Up to 750mA output currentSOT89-5 package
z Single pin on/off and brightness control using DC
voltage or PWM
z High efficiency (up to 95% )
z Up to 1MHz switching frequency
z Inherent open-circuit LED protection
z Thermal shutdown protection circuitry
Applications
z High Power LED Driver
z Automotive Lighting
z White LED Lamps
z Constant-Current Source
March 2009 Ver1.0
1 SI-EN Technology




SI-EN Technology

SN3340 Datasheet Preview

SN3340 Datasheet

350mA LED driver

No Preview Available !

Pin Configurations
Package
SOT23-5
SOT89-5
Pin Configurations
LX 1 5
VIN
GND
2
ADJ 3 4
ISENSE
SN3340
Pin Description
Pin Name
LX
GND
ADJ
ISENSE
VIN
NO. Description
1 Drain of power switch
2 Ground (0V)
Multi-function On/Off and brightness control pin:
* Leave floating for normal operation.(VADJ = VREF = 1.2V giving nominal average output current
IOUT nom =0.1/RS )
3 * Drive to voltage below 0.2V to turn off output current
* Drive with DC voltage (0.3V<VADJ <1.2V) to adjust output current from 25% to 100% of IOUTnom
* Drive with PWM signal to adjust output current.
* When driving the ADJ pin above 1.2V, the current will be set to 100% brightness automatically.
4 Connect resistor RS from this pin to VIN to define nominal average output current IOUTnom =0.1/RS
5
Input voltage (6V to 18V). Decouple to ground with 1μF or higher X7R ceramic capacitor close to
device
March 2009 Ver1.0
2 SI-EN Technology


Part Number SN3340
Description 350mA LED driver
Maker SI-EN Technology
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