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IL9910DT-A 데이터시트 PDF




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부품번호 IL9910DT-A 기능
기능 UNIVERSAL HIGH-VOLTAGE LED DRIVER
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IL9910DT-A 데이터시트, 핀배열, 회로
TECHNICAL DATA
UNIVERSAL HIGH-VOLTAGE LED DRIVER
IL9910-A/B/C
DESCRIPTION
The IL9910 is a PWM high-efficiency LED driver control IC. The IC is purposed for control
of LED lighting as source of constant current
FEATURES
8V to 450V input range
Maximum external consumption current
on VDD pin IDD(ext) 1 mA
Operating temperature range -40°C ~ +85°C
applications from a few mA to more than 1A Output
Brightness control for LED string from one
to hundreds of diodes
PWM Low-Frequency LED Dimming
APPLICATION
DC/DC or AC/DC LED Driver application
RGB Backlighting LED Driver
Back Lighting or Flat Panel Display
General purpose constant current source
Signage and Decorative LED Lighting
Automotive
Chargers
TA = -40to 85C
for all packages.
ORDERING INFORMATIOIN
Device
IL9910N-A
IL9910DT-A
IL9910N-B
IL9910DT-B
IL9910N-C
IL9910DT-C
Vcs
225~242mV
242~257mV
257~275mV
Package
DIP-8
SOP-8
DIP-8
SOP-8
DIP-8
SOP-8
1 2014, April Ver. 05




IL9910DT-A pdf, 반도체, 판매, 대치품
IL9910A/B/C
ELECTRICAL CHARACTERISTICS
(Т A =-40 ~ 85°C)
Symbol
Parameter
Test Condition
VDD
IDD(ext)
UVLO
VEN(hi)
REN
VCS(hi)
fOSC
IINsd
VGATE(hi)
VGATE(lo)
TBLANK
TDELAY
TRISE
TFALL
Internally regulated VIN = 8 V
voltage
VIN = 450 V
VDD pin current
VIN = 8 V
available for external VIN = 100 V
circuit
Under voltage lockout VIN rise
threshold
from 5 to 8 V
Enable high level
output voltage
VIN = 8 V
VIN = 450 V
PWM_D pin pull-down VEN = 5 V
resistance
VIN = 8 V
Current sense pull-in
threshold Voltage
A
B
C
Internal oscillator
frequency
VIN = 8 V
ROSC = 1 MOhm
VIN = 8 V
ROSC = 226 kOhm
Shutdown mode
consumption current
PWM_D pin is
connected to GND,
VIN = 8 V
PWM_D pin is
Gate high level output connected to VDD,
voltage
VIN = 8 V
VIN = 450 V
Gate low level output
voltage
PWM_D pin is
connected to GND,
VIN = 8 V
VIN = 450 V
Current sense
blanking interval
VCS = 0.55VLD,
VLD = VDD
Delay from CS trip to
GATE lo
Vin = 12V,
VLD
= 0.15, VCS = 0 to
0.22V after TBLANK
GATE output rise time CGATE = 500pF
GATE output fall time CGATE = 500pF
Value
Min Max
7.0 8.0
- 1.0
6.20 6.95
2.4 -
50 150
225 275
225 242
242 257
257 275
20 30
80 120
- 1.0
6.7 -
- 0.3
150 280
300
50
50
Ambient
temperature, Unit
°С
25 10
V
mA
V
V
kOhm
mV
kHz
mA
V
V
ns
ns
ns
ns
2014, April Ver. 05
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IL9910DT-A 전자부품, 판매, 대치품
IL9910A/B/C
DC/DC LOW VOLTAGE APPLICATIONS
Buck Converter Operation
The buck power conversion topology can be used when the LED string voltage is needed to be lower than
the input supply voltage. The design procedure for a buck LED driver outlined in the previous chapters can
be applied to the low voltage LED drivers as well. However, the designer must keep in mind that the input
voltage must be maintained higher than 2 times the forward voltage drop across the LEDs. This limitation is
related to the output current instability that may develop when the IL9910 buck converter operates at a duty
cycle greater than 0.5. This instability reveals itself as an oscillation of the output current at a sub-harmonic
of the switching frequency.
Flyback (Buck-Boost) Operation
This power conversion topology can be used when the forward voltage drop of the LED string is higher,
equal or lower than the input supply voltage. For example, the buck-boost topology can be appropriate when
input voltage is supplied by an automotive battery (12V) and output string consists of three to six HB LEDs,
as the case may be for tail and break signal lights.
In the buck-boost converter, the energy from the input source is first stored in the inductor or a Flyback
transformer when the switching transistor is ON. The energy is then delivered to the output during the OFF
time of the transistor.
When the energy stored in the Flyback inductor is not fully depleted by the next switching cycle (continuous
conduction mode) the DC conversion between input and output voltage is given by:
VOUT = - VIN*D/(1-D)
The output voltage can be either higher or lower than the input voltage, depending on duty ratio.
Let us discuss the above example of an automotive LED driver that needs to drive three HB LEDs at 350mA.
Knowing the nominal input voltage VIN=12V, the nominal duty ratio can be determined, as
D=VLEDs/(VIN+VLEDs)=9/(12+9)=0.43
Then, given the switching frequency, in this example Fosc=50KHz, the required on-time of the MOSFET
transistor can be calculated:
Ton=D/Fosc=8.6 microsecond
The required value of the inductor is given by:
L = VIN*Ton/(0.3*ILED)= 0.98mH, use 1mH
Output Capacitor
Unlike the buck topology, the buck-boost converter requires an output filter capacitor to deliver power to the
LED string during the ON time of switching the transistor, When the Flyback inductor current is diverted from
the output of the converter.
In order to average the current in the LED, this capacitor must present impedance to the switching output AC
ripple current that is much lower than the dynamic impedance ROUT of the LED string. If we assume ROUT=3
Ohm in our example, in order to attenuate the switching ripple by a factor of 10, a capacitor with equivalent
series resistance(ESR)of 0.3 Ohm is needed. A chip SMT tantalum capacitor can be selected for this
purpose.
2014, April Ver. 05
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부품번호상세설명 및 기능제조사
IL9910DT-A

UNIVERSAL HIGH-VOLTAGE LED DRIVER

IK Semiconductor
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