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PDF SN3340 Data sheet ( Hoja de datos )
| Número de pieza | SN3340 | |
| Descripción | 350mA LED driver | |
| Fabricantes | SI-EN Technology | |
| Logotipo |  |
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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 current（SOT89-5 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
1 page  
SN3340
Electrical characteristics (test conditions: VIN=12V, Tamb=25°C unless otherwise stated) (*) (continued)
Symbol
Parameter
Conditions
Min. Typ. Max. Unit
ILX(leak) LX switch leakage current
DPWM(LF)
Brightness control range at
low frequency PWM signal
PWM frequency =100Hz PWM
amplitude=5V,Vin=15V, L=27uH, Driving 1
LED
PWM frequency =10KHz PWM
DPWM(HF)
Brightness control range at
high frequency PWM signal
amplitude=5V,Vin=15V, L=27uH, Driving 1
LED
1 μA
1200:1
13:1
fLX Operating frequency
ADJ pin floating
L=100μH (0.82Ω) IOUT=350mA @ VLED=3.4V
Driving 1 LED
154
KHz
TONmin
TOFFmin
fLXmax
DLX
TPD
TSD
Minimum switch ‘ON’ time
Minimum switch ‘OFF’ time
Recommended maximum
operating frequency
Recommended duty cycle
range of output switch at
fLXmax
Internal
comparator
propagation delay
Thermal
shutdown
temperature
LX switch ‘ON’
LX switch ‘OFF’
200 ns
200 ns
1 MHz
0.3 0.7 0.9
50 ns
140 °C
TSD-HYS Thermal shutdown hysteresis
20 °C
NOTES:
(*) Production testing of the chip is performed at 25°C. Functional operation of the chip and parameters specified are guaranteed by design,
characterization and process control .in other temperature.
March 2009 Ver1.0
5 SI-EN Technology
5 Page 
Package Information
SOT23-5
SN3340
March 2009 Ver1.0
11 SI-EN Technology
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SN3340.PDF ] | |
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