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PDF LM3433 Data sheet ( Hoja de datos )
| Número de pieza | LM3433 | |
| Descripción | Common Anode Capable High Brightness LED Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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November 26, 2007
www.DataSheet4U.com
LM3433
Common Anode Capable High Brightness LED Driver with
High Frequency Dimming
General Description
The LM3433 is an adaptive constant on-time DC/DC buck
(step-down) constant current controller (a true current
source). The LM3433 provides a constant current for illumi-
nating high power LEDs. The output configuration allows the
anodes of multiple LEDs to be tied directly to the ground ref-
erenced chassis for maximum heat sink efficacy. The high
frequency capable architecture allows the use of small exter-
nal passive components and no output capacitor while main-
taining low LED ripple current. Two control inputs are used to
modulate LED brightness. An analog current control input is
provided so the LM3433 can be adjusted to compensate for
LED manufacturing variations and/or color temperature cor-
rection. The other input is a logic level PWM control of LED
current. The PWM functions by shorting out the LED with a
parallel switch allowing high PWM dimming frequencies. High
frequency PWM dimming allows digital color temperature
control, interference blanking, field sequential illumination,
and brightness control. Additional features include thermal
shutdown, VCC under-voltage lockout, and logic level shut-
down mode. The LM3433 is available in a low profile LLP-24
package.
Features
■ Operating input voltage range of -9V to -14V w.r.t. LED
anode
■ Control inputs are referenced to the LED anode
■ Output current greater than 6A
■ Greater than 30kHz PWM frequency capable
■ Negative output voltage capability allows LED anode to be
tied directly to chassis for maximum heat sink efficacy
■ No output capacitor required
■ Up to 1MHz switching frequency
■ Low IQ, 1mA typical
■ Soft start
■ Adaptive programmable ON time allows for constant ripple
current
■ LLP-24 package
Applications
■ LCD backlighting
■ Projection systems
■ Solid state lighting
■ Automotive lighting
Typical Application Circuit
© 2007 National Semiconductor Corporation 300315
30031531
www.national.com
1 page  
Symbol
Parameter
ROLP
DIMO output low resistance
ROHP
DIMO output high resistance
FUNCTIONAL CONTROL
Conditions
I = 5mA source
I = 5mA sink
Min(Note 5) Typ(Note 6) Max(Note 5) Units
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20
30 Ω
VINUVLO
VCCUVLO
VIN undervoltage lockout
With respect to CGND
VCC - VEE undervoltage lockout On Threshold
thresholds
Off threshold
1.4
6.0 6.6 7.0
4.9 5.4 5.8
V
V
VEN Enable threshold, with respect Device on w.r.t. CGND
to CGND
Device off w.r.t. CGND
0.6
1.6
V
REN
VDIM
Enable pin pullup resistor
DIM logic input threshold
DIM rising threshold w.r.t.
CGND
100
1.6
DIM falling threshold w.r.t.
CGND
0.6
kΩ
V
RDIM
DIM pin pulldown resistor
IADJ ADJ pin current
ISS SS pin source current
RSS SS pin pulldown resistance
AC SPECIFICATIONS
EN = CGND
100
-1.0 1.0
10
1.0
kΩ
µA
µA
kΩ
TDTD
LO and HO dead time
LO falling to HO rising dead
time
HO falling to LO rising dead
time
26
28
ns
TPDIM
DIM to DIMO propagation
delay
DIM rising to DIMO rising delay
DIM falling to DIMO falling
delay
68 124
ns
58 160
THERMAL SPECIFICATIONS
TJLIM
Junction temperature thermal
limit
175 °C
TJLIM(hyst)
θJA
Thermal limit hysteresis
LLP-24 package thermal
resistance
JEDEC 4 layer board
20 °C
39 °C/W
Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended
to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The HS pin can go to -6V with respect to VEE for 30ns and +22V with respect to VEE for 50ns without sustaining damage.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance,
θJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD (MAX) = (TJ(MAX) − TA)/
θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal
shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at TJ=175°C (typ.) and disengages at TJ=155°C (typ).
Note 4: Human Body Model, applicable std. JESD22-A114-C. Machine Model, applicable std. JESD22-A115-A. Field Induced Charge Device Model, applicable
std. JESD22-C101-C.
Note 5: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used
to calculate Average Outgoing Quality Level (AOQL).
Note 6: Typical numbers are at 25°C and represent the most likely norm.
5 www.national.com
5 Page 
Manufacturer
Coilcraft
Coiltronics
Pulse
Some Recommended Inductors (Others May Be Used)
Inductor
GA3252-AL and SER1360 series
HCLP2 series
PB2020 series
www.DataSheet4U.com
Contact Information
www.coilcraft.com
800-322-2645
www.coiltronics.com
www.pulseeng.com
Some Recommended Input/Bypass Capacitors (Others May Be Used)
Manufacturer
Vishay Sprague
Taiyo Yuden
Cornell Dubilier
MuRata
Capacitor
293D, 592D, and 595D series tantalum
High capacitance MLCC ceramic
ESRD seriec Polymer Aluminum Electrolytic
SPV and AFK series V-chip series
High capacitance MLCC ceramic
Contact Information
www.vishay.com
407-324-4140
www.t-yuden.com
408-573-4150
www.cde.com
www.murata.com
Manufacturer
Siliconix
ON Semiconductor
Some Recommended MOSFETs (Others May Be Used)
Inductor
Si7386DP (Main FET, DIM FET)
Si7668ADP (Synchronous FET)
NTMFS4841NHT1G (Main FET, Synchronous FET, DIM
FET)
Contact Information
www.vishay.com/company/brands/
siliconix/
www.onsemi.com
11 www.national.com
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LM3433.PDF ] | |
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