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PDF RT8301A Data sheet ( Hoja de datos )
| Número de pieza | RT8301A | |
| Descripción | 8-CH Constant Current LED Driver | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8301A (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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®
RT8301A
8-CH Constant Current LED Driver for Display Backlight
General Description
The RT8301A is a 8-CH constant current sink LED drivers
with Dynamic Headroom Control (DHC) function. RT8301A
can provide well current matching ability, adjustable VSET
to choose the suitable dropout voltage across the MOS /
BTJ. Beside that, DHC will provide the stable VFB
dimming, thus voltage ripple is kept as small even during
the dimming.
The RT8301A provides four channel constant currents with
less than 3% differences in output current value among
the 8-CH and ICs respectively. The constant current is
adjustable by each channel external resistor (RISET). The
LED brightness can also be adjusted via the EN/PWM
pin with PWM dimming duty from 1% to 100%. The
RT8301A can operate with external components for high
current applications.
The DHC function generates feedback signal to DC/DC
control loop and regulate the output voltage. When
RT8301A selects the LED string with the highest forward
voltage, and then the COMP is defined according to that
particular string. The COMP voltage is then compared
with the voltage of VSET to determine the voltage level of
VFB, which therefore control the switching of the primary
controller.
RT8301A's protection features include Short LED
Protection (SLP), Open LED Protection (OLP) and Over
Temperature Protection (OTP). When any channel triggers
protection function, LED will be turned off and the FAULT
pin will pull low.
The RT8301A is available in SOP-24 package to achieve
optimized solution for PCB space.
Simplified Application Circuit
VOUT
COUT
8 x NLEDs
DSL11
DSL18
VCC
VSET
RSET1
RSET2
CVCC1
FAULT
RT8301A
VCC
FAULT
RSLP
SLP
Q1 ZD2
……
VSET
VFB
SLP
VCC COMP
RCOMP
COMP
CCOMP
DC11
D1
DC18
……
COMP1
RFAULT
VCC
FAULT OUT1
CS1
M11
PWM Signal
EN/PWM
OUT8
……
CS8
GND
……
RS11
M18
RS18
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8301A-02 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT8301A
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage, VCC ---------------------------------------------------------------------------------------------- −0.3V to 30V
z CS1 to CS8 ----------------------------------------------------------------------------------------------------------------- −0.3V to 7V
z SLP, EN/PWM, COMP, VSET ----------------------------------------------------------------------------------------- −0.3V to 16V
z (OUT1 to OUT8), VFB, FAULT ----------------------------------------------------------------------------------------- −0.3V to 16V
z Power Dissipation, PD @ TA = 25°C
SOP-24 ---------------------------------------------------------------------------------------------------------------------- 1.111W
z Package Thermal Resistance (Note 2)
SOP-24, θJA ---------------------------------------------------------------------------------------------------------------- 90°C/W
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
z Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ---------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 4)
z Supply Input Voltage, VCC ---------------------------------------------------------------------------------------------- 5V to 24V
z Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VCC = 12V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Supply Current
Shutdown Current
Under Voltage Lockout
Threshold
IVCCON
ISHDN
VUVLO
VEN/PWM = 4V
VEN/PWM = 0V
Under Voltage Lockout
Threshold Hysteresis
ΔVUVLO
Enable / PWM
EN/PWM Input
Threshold Voltage
Shutdown Delay
Logic-High VIH
Logic-Low VIL
tSHDN
EN/PWM Sink Current
IIH
PWM Dimming Frequency
fPWM
PWM Dimming Duty
PWM Frequency = 500Hz
Current Sink
CSx Reference Voltage
Channel to Channel Accuracy
VREF
VMATCH
VEN/PWM = 4V (Note 5)
PWM Frequency = 500Hz,
Duty = 80%
Min Typ Max Unit
-- 6 -- mA
-- 20 -- μA
-- 3.7 --
V
-- 500 -- mV
2 -- --
V
-- -- 1
-- 32 -- ms
-- -- 2 μA
90 -- 500 Hz
1 -- 100 %
582 600 618 mV
-- 2.5 -- %
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8301A-02 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8301A
VFB Output Voltage vs. Input Voltage
4.0
VEN/PWM = 4V
3.2 VFB(MAX)
2.4
1.6
VEN/PWM
(2V/Div)
VFB
(2V/Div)
0.8
0.0
5
VFB(MIN)
9 13 17 21
Input Voltage (V)
ILED1
(100mA/Div)
25
VEN/PWM
(2V/Div)
Power Off
VCC = 12V, ILED1 = 120mA
TSHDN = 32ms
VCOMP
(1V/Div)
VFB
(2V/Div)
VSET
(1V/Div)
ILED1
(100mA/Div)
VFB
(2V/Div)
Time (25ms/Div)
VEN/PWM
(5V/Div)
VCS1
(100mV/Div)
VFB
(2V/Div)
ILED2
(100mA/Div)
Open Protection
VCC = 12V, VEN/PWM = 4V, ILED1 = 120mA
TSS = 128ms
TFB = 256ms
TSHDN = 32ms
VEN/PWM
(5V/Div)
VSLP
(2V/Div)
ILED1
(100mA/Div)
Time (100ms/Div)
Power On
VCC = 12V, ILED1 = 120mA
Time (1ms/Div)
DHC Function
VCOMP = VSET = 1.8V, VFB = 2.3V
Time (10μs/Div)
Short Protection
VCC = 12V, VEN/PWM = 4V, ILED1 = 120mA
Time (250ms/Div)
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS8301A-02 April 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet RT8301A.PDF ] | |
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