RT8494 Datasheet, PDF (7/17 Pages) Richtek Technology Corporation – High Voltage High Current LED Driver Controller

RT8494
Parameter
LED Dimming
Symbol
Analog Dimming ACTL Pin
Input Current
IACTL
LED Max Current Threshold at
ACTL
LED Current Off Threshold at
ACTL
VACTL_On
VACTL_Off
DCTL Input Current
IDCTL
DCTL Threshold Voltage
VDCTL_H
VDCTL_L
PWM Control
Switching Frequency
fSW
Minimum Off-Time
GBIAS Voltage
GATE Voltage High
VGBIAS
VGATE_H
GATE Voltage Low
VGATE_L
GATE Drive Rise and Fall Time
PWM Switch Current Limit
Threshold
ISW _LIM
OVP and Soft-Start
OVP Threshold
VOVP_th
OVP Input Current
IOVP
Soft-Start Pin Current
ISS
Thermal Shutdown Protection TSD
Thermal Shutdown Hysteresis TSD
Test Conditions
VACTL = 1.2V
VACTL = 0.2V
0.3V  VDCTL  5V
(Note 6)
(Note 6)
RRSET = 30k
RRSET = 30k
Switch Gate Driver
IGBIAS = 20mA
IGATE = 50mA
IGATE = 100A
IGATE = 10mA
IGATE= 100A
1nF Load at GATE
0.7V  VOVP  1.5V
VSS  2V
Min Typ Max Unit
--
1
--
A
--
10
--
--
1.3
--
V
--
0.2
--
V
--
--
0.5 A
2
--
--
V
--
--
0.3
280 370 450 kHz
--
250
--
ns
7.8 8.5 9.2
V
6
7.2 7.8
7.5 7.8 7.9
V
--
0.5
1
V
--
0.1 0.9
--
20 100 ns
80 110 145 mV
-- 1.18 --
V
--
--
0.1 A
--
6
--
A
--
145
--
--
10
--
C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and 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 may affect
device reliability.
Note 2. If connected with a 20kΩ serial resistor, ACTL and DCTL can go up to 36V.
Note 3. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 4. Devices are ESD sensitive. Handling precaution is recommended.
Note 5. The device is not guaranteed to function outside its operating conditions.
Note 6. Guaranteed by design, not subjected to production test.
Note 7. The ACTL dimming curve is saturating when VACTL ≥ 1.2V. Please refer to typical operation characteristics curve of ILED
vs VACTL. This item is not subjected to production test.
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS8494-01 November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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