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PDF RT8496 Data sheet ( Hoja de datos )
| Número de pieza | RT8496 | |
| Descripción | High Voltage High Current LED Driver Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8496 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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®
RT8496
High Voltage High Current LED Driver Controller for
Buck, Boost or Buck-Boost Topology
General Description
The RT8496 is a current-mode PWM controller designed
to drive an external MOSFET for high current LED
applications. With a current sense amplifier threshold of
315mV, the LED current is adjustable with one external
current sense resistor. With the maximum operating input
voltage of 36V and output voltage up to 150V, the RT8496
is ideal for Buck, Boost or Buck-Boost operation.
With the switching frequency programmable over 100kHz
to 1MHz, the external inductor and capacitors can be small
while maintaining high efficiency.
Dimming can be done by either analog or digital. The built-
in clamping comparator and filter allow easy low noise
analog dimming conversion from digital signal with only
one external capacitor.
The RT8496 is available in the SOP-14 package.
Applications
General Industrial High Power LED Lighting
Desk Lights and Room Lighting
Building and Street Lighting
Industrial Display Backlight
Features
High Voltage Capability : VIN Up to 36V, LED Sensing
Threshold Common Mode Voltage Up to 150V
Buck, Boost or Buck-Boost Operation
Adjustable Switching Frequency
Easy Dimming Control : Analog or Digital
Converting to Analog with One External Capacitor
Adjustable Soft-Start to Avoid Inrush Current
Adjustable Over-Voltage Protection
VIN Under-Voltage Lockout and Thermal Shutdown
Ordering Information
RT8496
Package Type
S : SOP-14
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
VIN2
VIN1
Analog
Dimming
RVC
CVC
CIN
CSS
CB
RT8496
VCC
GATE
SYNC
ISW
ACTL
DCTL
VC
SS
GBIAS
ISN
ISP
OVP
RSET
GND
L1 D1
M1
RSW
COUT
RSENSE
RRSET
R1
R2
VOUT
VOUT
LEDs
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8496-01 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8496
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VCC ---------------------------------------------------------------------------------------------- −0.3V to 38V
GBIAS, GATE -------------------------------------------------------------------------------------------------------------- −0.3V to 10V
ISW --------------------------------------------------------------------------------------------------------------------------- −0.3V to 1V
ISP, ISN ---------------------------------------------------------------------------------------------------------------------- −0.3V to 180V
DCTL, ACTL, OVP (Note 2) ------------------------------------------------------------------------------------------- −0.3V to 8V
SYNC ------------------------------------------------------------------------------------------------------------------------ −0.3V to 20V
SS, RSET, VC -------------------------------------------------------------------------------------------------------------- −0.3V to 5V
Power Dissipation, PD @ TA = 25°C
SOP-14 ---------------------------------------------------------------------------------------------------------------------- 0.87W
Package Thermal Resistance (Note 3)
SOP-14, θJA ----------------------------------------------------------------------------------------------------------------- 113.9°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 4)
HBM (Human Body Model), except the HV pins ISP (500V) and ISN (500V) ------------------------------- 2kV
MM (Machine Model) ----------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 5)
Supply Input Voltage Range, VCC ------------------------------------------------------------------------------------- 4.5V to 36V
ISP, ISN ---------------------------------------------------------------------------------------------------------------------- 150V
Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
Electrical Characteristics
(VCC = 24V, No Load on any Output, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Overall
Supply Current
SYNC Input
Voltage
Logic-High
Logic-Low
SYNC Input Current
IVCC
VSYNCH
VSYNCL
VVC 0.4V (Switching Off)
SYNC > 2V
Current Sense Amplifier
Input Threshold (VISP VISN)
ISP Input Current
ISN Input Current
VC Output Current
VC Threshold for PWM
Switch Off
IISP
IISN
IVC
VACTL = 1.4V,
12V Common Mode 150V
4.5V VISP 150V
4.5V VISN 150V
VISP VISN = 315mV,
0.5V VC 2.4V
Min Typ Max Unit
-- 6 7.2 mA
2
--
--
--
--
0.8
V
-- -- 1.2 A
302 315 328 mV
-- 140 --
-- 60 --
-- 20 --
A
A
-- 0.7 --
V
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8496-01 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
DCTL Dimming on PWM Duty 80%
RT8496
Power On form VCC Voltage
IOUT
(100mA/Div)
IL
(2A/Div)
PWM
(5V/Div)
IOUT = 150mA, PWM Duty = 80%, L = 68μH
Time (5μs/Div)
VCC
(10V/Div)
GATE
(10V/Div)
IOUT
(200mA/Div)
Power Off form VCC Voltage
IOUT = 150mA, PWM Duty = 50%, L = 68μH
Time (10ms/Div)
VCC
(10V/Div)
GATE
(10V/Div)
IOUT
(200mA/Div)
IOUT = 150mA, PWM Duty = 50%, L = 68μH
Time (10ms/Div)
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8496-01 December 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet RT8496.PDF ] | |
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