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PDF RT8458 Data sheet ( Hoja de datos )
| Número de pieza | RT8458 | |
| Descripción | High Efficiency PWM Buck LED Driver Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8458 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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Preliminary
RT8458
High Efficiency PWM Buck LED Driver Controller
General Description
The RT8458 is a PWM controller with an integrated high
side floating gate driver. It is used for step down converters
by well controlling the external MOSFET and regulating a
constant output current. The output duty cycle of the
RT8458 can be up to 100% for wider input voltage
application, such as E27 and PAR30 off-line LED lighting
products.
The RT8458 also features a 48kHz fixed frequency
oscillator, an internal 178mV precision reference, and a
PWM comparator with latching logic. The accurate output
LED current is achieved by an averaging current feedback
loop and the LED current dimming can be easily controlled
via the ACTL pin. The RT8458 also has multiple features
to protect the controller from fault conditions, including
Under Voltage Lockout (UVLO), Over Current Protection
circuit (OCP) and Over Voltage Protection (OVP).
Additionally, to ensure the system reliability, the RT8458
is built with the thermal protection function.
The RT8458 is housed in a TSOT-23-6 package. Thus,
the components in the whole LED driver system can be
made very compact.
Ordering Information
RT8458
Package Type
J6 : TSOT-23-6
Operating Temperature Range
G : Green (Halogen Free with Comme-
rcial Standard)
Note :
Richtek Green 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.
Features
z Low Cost and Efficient Buck Converter Solution
z Universal Input Voltage Range with Off-Line
Topology
z Programmable Constant LED Current
z Dimmable LED Current by ACTL
z Output LED String Open Protection
z Output LED String Short Protection
z Output LED String Over Current Protection
z Built-in Thermal Protection
z Tiny TSOT-23-6 Package
z RoHS Compliant and Halogen Free
Applications
z E27, PAR30, Offline LED Lights
Pin Configurations
(TOP VIEW)
SENSE VC ACTL
654
23
VCC GND GATE
TSOT-23-6
Marking Information
01=DNN
01= : Product Code
DNN : Date Code
DS8458-P03T00 February 2011
www.richtek.com
1
1 page  
Preliminary
RT8458
Parameter
Symbol
LED Dimming
Analog Dimming ACTL Pin Input
Current
LED Current Off Threshold at
ACTL
VC Threshold for PWM Switch Off
IACTL
VA CT L_Of f
VV C
Thermal Protection
Thermal Shutdown Temperature TSD
Test Conditions
Min Typ Max Unit
-- 1 -- μA
-- -- 0.1
-- 1.25 --
V
V
-- 150 -- °C
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2. θJA is measured in natural convection at TA = 25°C on a low effective thermal conductivity test board of JEDEC 51-3
thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
DS8458-P03T00 February 2011
www.richtek.com
5
5 Page 
Outline Dimension
C
Preliminary
D
B
H
L
RT8458
b
A
e
A1
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min
0.700
Max
1.000
0.000
0.100
1.397
1.803
0.300
0.559
2.591
3.000
2.692
3.099
0.838
1.041
0.080
0.254
0.300
0.610
Dimensions In Inches
Min
0.028
Max
0.039
0.000
0.004
0.055
0.071
0.012
0.022
0.102
0.118
0.106
0.122
0.033
0.041
0.003
0.010
0.012
0.024
TSOT-23-6 Surface Mount Package
Richtek Technology Corporation
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)86672399 Fax: (8862)86672377
Email: [email protected]
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
DS8458-P03T00 February 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet RT8458.PDF ] | |
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