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Teilenummer | IK2802 |
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Beschreibung | HIGH-POWER LED DRIVER | |
Hersteller | IK Semicon | |
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Gesamt 13 Seiten TECHNICAL DATA
HIGH-POWER LED DRIVER
FEATURES
2 constant-current output channels
Constant output current invariant to load voltage
change
Maximum output constant current per channel:
360 mA
Thermal protection and flag
Output current adjusted through an external resis-
tor
Schmitt trigger input
5V supply voltage
Package type: Pb-free package with thermal pad
IK2802
Small Outline Package
SOP8
Device
IK2802DT
ORDERING INFORMATION
Operating Tempera-
ture Range
Package
ТА = - 40 ... + 85 С
SOP-8
Shipping
Tape& Reel
Current Accuracy
Between Channels
Between ICs
<±3%
<±6%
Conditions
IOUT = 40mA ~ 360 mA
@ VDS= 0.6V
PRODUCT DESCRIPTION
IK2802 is an instant On/Off LED driver for high power LED applications and exploits to enhance its
output characteristics.
IK2802 provides users with 2-channel constant current ports. Users may adjust the output current up
to 360 mA through an external resistor, Rext, which gives users flexibility in controlling the light intensity of
LEDs. Also, users can precisely adjust LED brightness from 0% to 100% via output control with Pulse Width
Modulation. Alternatively, IK2802 provides one-step current adjustment to make 25% of the output current
via enabling the quarter pin (QT) as “Low”.
Additionally, to ensure the system reliability, IK2802 is built with Thermal Protection (TP) function and
thermal pad. The TP function protects IC from over temperature (165°C). Also, the thermal pad enhances
the power dissipation. As a result, a large amount of current can be sunk safely in one package.
APPLICATIONS
High-flux LED lighting
Automotive interior lighting
1 2011, February Ver. 03
IK2802
Figure 2
SWITCHING CHARACTERISTICS
Characteristics
Propagation Delay
Time(“L” to “H”)
Propagation Delay
Time(“L” to “H”)
OE-OUTn
OE-OUTn
Pulse width
OE
Symbol
tpLH
tpHL
tw(OE)
Output Rise Time of OUT (turn off)
tor
Output Rise Time of OUT (turn on)
tof
Condition
VDD=5.0V
VDS=1.0V
VIH=VDD
VIL=GND
Rext=1630Ohm
(IOUTn=360mA)
VL=4.0V
RL=8.5Ohm
CL=10pF
Min. Typ. Max. Unit
0.3 0.5 1 us
0.3 0.5 1 us
1 - - us
0.3 0.5 1 us
0.3 0.5 1 us
TEST CIRCUIT FOR SWITCHING CHARACTERISTICS
Figure 3
6 2011, February Ver. 03
6 Page IK2802
TP Function (Thermal Protection)
Thermal protection turns off the output current when the junction temperature rises to approximately 165°C, al-
lowing the device to cool and the thermal error flag,
goes low simultaneously. When the junction tempera-
ture cools to approximately 155°C, the output current is turned on again. Depending on power dissipation, ther-
mal resistance, and ambient temperature, the thermal protection circuit may cycle on and off. This limits the dis-
sipation of the driver, protecting it from damage due to overheating.
Load Supply Voltage (VLED)
IK2802 is designed to operate with adequate VDS to achieve constant current. VDS together with IOUT should not
exceed the package power dissipation limit, PD(max).
As in Figure 8, VDS = VLED – VF, and VLED is the load supply voltage. PD(act) will be greater than PD(max), if VDS drops
too much voltage on the driver. In this case, it is recommended to use the lowest possible supply voltage or to set
an external voltage reducer, VDROP.
A voltage reducer lets VDS = (VLED –VF) – VDROP.
Resistors can be used in the applications as shown in Figure 8.
Figure 8
12 2011, February Ver. 03
12 Page | ||
Seiten | Gesamt 13 Seiten | |
PDF Download | [ IK2802 Schematic.PDF ] |
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