|
|
PDF ISL97684 Data sheet ( Hoja de datos )
| Número de pieza | ISL97684 | |
| Descripción | (ISL97682 - ISL97684) Compact 2-3-4-Ch LED Drivers | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL97684 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
|
No Preview Available !
Compact 2-3-4-Ch LED Drivers with Phase Shift Control
ISL97682, ISL97683, ISL97684
The ISL97682, ISL97683, ISL97684 are Intersil’s highly
integrated 2-3-4-channels LED drivers that are suitable for
medium size TFT-LCD backlights. These parts can drive multiple
channels of LEDs from inputs as low as 4V to outputs of up to
45V. They can also operate from inputs as low as 3V to outputs of
up to 26.5V in bootstrap configuration (see Figure 26 for 3V
operation).
The ISL97682, ISL97683, ISL97684 feature optional channels
phase shift control. This feature is used to minimize the input,
output ripple characteristics and load transient, which help
eliminate or reduce the video and audio noise interference from
the backlight driver operation.
The ISL97682, ISL97683, ISL97684 offer 8-bit PWM dimming for
systems that need frequency tuning flexibility. With the unique
adaptive boost switching architecture, the ISL97682, ISL97683,
ISL97684 also offer Direct PWM dimming with output, which
follows input and achieves linearity as low as 0.009% at 200Hz
or 1.35% at 30kHz.
The drivers incorporate dynamic headroom control that monitors
the highest LED forward voltage string and uses its feedback signal
for the minimum output regulation. The ISL97682, ISL97683,
ISL97684 incorporates extensive fault protection functions including
string open and short circuit detections, OVP, and OTP. The switching
frequency can be selected at either 600kHz or 1.0MHz in PFM or
PWM mode. These parts are available in the thin and compact
16 Ld 3mmx3mm TQFN package and operate in ambient
temperature from -40°C to +85°C.
Features
• ISL97682 - 2 x 100mA Channels
• ISL97683 - 3 x 50mA Channels
• ISL97684 - 4 x 50mA Channels
• Input Voltage 4.0V~26.5V with Max VOUT of 45V
• Input Voltage 3.0V (see Figure 26)~24V with Max VOUT of 26.5V
• PWM Dimming Linearity
- PWM Dimming with Adjustable Dimming Frequency with
Duty Cycle Linear from 0.4% to 100% <30kHz
- Direct PWM Dimming with Duty Cycle Linear from 0.009%
to 100% at 200Hz
• Current Matching of 0.7% typical from 1%~100% Dimming
• Selectable 600kHz or 1MHz Switching Frequency in PWM/PFM
Mode
• Dynamic Headroom Control
• Fault Protection
- String Open/Short Circuit Protections, OVP, OTP
• Thin and Compact TQFN-16 3mmx3mm Package
Applications
• Tablet to Notebook PC Displays LED Backlighting
• PMP LED Backlighting
VIN = 4~26.5V
Ci
L1
10µH
D1
10µF
7 VIN
LX 9
0.1µF
11 VDC ISL97684
1µF
6 EN
OVP 12
5 PWMI
3 RSET
PGND 10
8 FPWM/DIRECTPWM
4 FSW
www.DataSheet4U.c2omCOMP
CH1 13
CH2 14
CH3 15
CH4 16
45V, 4 x 50mA*
Co
4.7µF
1 AGND
*VIN> = 9V AND WITH
GOOD LEDS MATCHING
VIN = 4~26.5V
Ci
L1
10µH
D1
10µF
0.1µF
1µF
7 VIN
11 VDC
ISL97684
6 EN
5 PWMI
3 RSET
8 FPWM/DIRECTPWM
4 FSW
2 COMP
LX 9
OVP 12
PGND10
CH1 13
CH2 14
CH3 15
CH4 16
45V, 4 x 50mA*
Co
4.7µF
1 AGND
*VIN >=9V AND WITH
GOOD LEDS MATCHING
FIGURE 1A. DIRECT PWM DIMMING
FIGURE 1B. PWM DIMMING WITH DIMMING FREQUENCY
FIGURE 1.
ISL97684
TYPICAL
APPLICATION
ADJUSTMENT
DIAGRAMS
USING
RFPWM
March 11, 2011
FN7689.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL97682, ISL97683, ISL97684
Absolute Maximum Ratings
VIN, EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 28V
VDC, PWMI, FPWM/DirectPWM, FSW, RSET, COMP, OVP . . . -0.3V to 5.5V
CH1 to CH4, LX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 45V
PGND, AGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
Above voltage ratings are all with respect to AGND pin
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Thermal Information
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
16 LD TQFN (Notes 4, 5) . . . . . . . . . . . . . . .
51
4.6
Thermal Characterization (Typical)
PSIJT (°C/W)
16 Ld TQFN (Note 6). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.11
Maximum Continuous Junction Temperature . . . . . . . . . . . . . . . . .+125°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
5. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
6. PSIJT is the PSI junction-to-top thermal characterization parameter. If the package top temperature can be measured with this rating then the die
junction temperature can be estimated more accurately than the θJC and θJC thermal resistance ratings.
5E. lectrical Specifications All specifications below are characterized at TA = -40°C to +85°C; VIN = 12V, EN = 5V, RSET = 20kΩ,
unless otherwise noted. Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
DESCRIPTION
GENERAL
VIN
IVIN
IVIN_STBY
Backlight Supply Voltage, (Note 8)
VIN Active Current
VIN Shutdown Current
VOUT
Output Voltage
VUVLO
Undervoltage Lockout Threshold
VUVLO_HYS
Undervoltage Lockout Hysteresis
LINEAR REGULATOR
VDC LDO Output Voltage
VLDO
VDC LDO Dropout Voltage
ENLow
Guaranteed Range for EN Input Low Voltage
ENHi
Guaranteed Range for EN Input High Voltage
tEN(Low)
EN low time before shut-down
BOOST SWITCHING REGULATOR
SS Soft-start
SWILimit
rDS(ON)
Eff_peak
Boost FET Current Limit
Internal Boost Switch ON-Resistance
Peak Efficiency
www.DataSheet4U.com
DMAX
Boost Maximum Duty Cycle
CONDITION
TA = +25°C
EN = 3.3V
EN = 0V, TA = 25°C
4.0V < VIN ≤ 26.5V
VIN > 6V
VIN = 5V, IVDC = 20mA
100% LED Duty Cycle
VIN = 24V, 48 LEDs, 30mA
each, L = 10µH with DCR
≤100mΩ, TA = +25°C
VIN = 12V, 48 LEDs, 30mA
each, L = 10µH with DCR ≤
100mΩ, TA = +25°C
VFSW < 2.4V (FSW = 600kHz)
VFSW > 2.4V
(FSW =1.0MHz)
MIN
(Note 7)
4.0
2.2
4.6
1.5
1.4
92
85
TYP
5
100
4.8
30
29.5
7
1.8
500
90.1
87
MAX
(Note 7)
UNIT
26.5
5
45
2.5
V
mA
µA
V
V
mV
5V
200 mV
0.5 V
V
ms
ms
2.3 A
mΩ
%
%
%
%
5 FN7689.0
March 11, 2011
5 Page 
ISL97682, ISL97683, ISL97684
Maximum DC Current Setting
The initial brightness should be set by choosing an appropriate
value for RSET. This should be chosen to fix the maximum
possible LED current as shown in Equation 2 for ISL97682 and
Equation 3 for ISL97683 and ISL97684:
ILEDmax = -(-R-8---S0---E-4--T--)
(EQ. 2)
ILED1-20mA
ILED2-20mA
ILED3-20mA
ILED4-20mA
ILEDmax = -(-R-4---S0---E-2--T--)
(EQ. 3)
DC Current Adjustment
Once RSET is fixed, the LED DC current can be adjusted.
For example, in the 4-channel ISL97684, if the maximum required
LED current (ILED(max)) is 20mA, rearranging Equation 3 yields
Equation 4:
RSET = (402) ⁄ 0.02 = 20.1kΩ
(EQ. 4)
PWM Control
The ISL97682, ISL97683, ISL97684 have high speed 8-bit
digitizers that decode the incoming PWM signal and convert it into
2- 3- or 4- channels of 8-bit PWM current with a phase shift
function that will be described later. During the PWM On period,
the LED peak current is defined by the RSET resistor value. The
average LED current of each channel is controlled by ILEDmax and
the PWM duty cycle in percent shown by Equation 5:
ILED(ave) = ILEDmax × PWM
(EQ. 5)
When the PWM input = 0, all channels are disconnected and the
ILED is guaranteed to be <5µA in this state.
The PWM dimming frequency is adjusted by a resistor at the
RFPWM pin, described in “PWM Dimming Frequency
Adjustment” on page 12.
ILED1-20mA
ILED2-20mA
ILED3-20mA
ILED4-20mA
ILED_Total_80mA
5 10 15
www.DataSheet4U.com
TIME (ms)
FIGURE 20. CONVENTIONAL 4-Ch LED DRIVER WITH 10% PWM
DIMMING CHANNEL CURRENT (UPPER) AND TOTAL
CURRENT (LOWER)
ILED_Total_20mA
5 10
TIME (ms)
FIGURE 21. PHASE SHIFT 4-Ch LED DRIVER WITH 10% PWM
DIMMING CHANNEL CURRENT (UPPER) AND TOTAL
CURRENT (LOWER)
ILED4-20mA
ILED3-20mA
ILED2-20mA
ILED1-20mA
ILED_Total_80mA
5 10
TIME (ms)
FIGURE 22. CONVENTIONAL LED DRIVER PWM DIMMING CHANNEL
AND TOTAL CURRENT AT 50% DUTY CYCLE
ILED4-20mA
ILED3-20mA
ILED2-20mA
ILED1-20mA
ILED_Total_40mA
5 10
TIME (ms)
FIGURE 23. EQUAL PHASE SHIFT LED DRIVER PWM DIMMING
CHANNEL AT 50% DUTY CYCLE
11 FN7689.0
March 11, 2011
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet ISL97684.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL97682 | (ISL97682 - ISL97684) Compact 2-3-4-Ch LED Drivers | Intersil Corporation |
| ISL97683 | (ISL97682 - ISL97684) Compact 2-3-4-Ch LED Drivers | Intersil Corporation |
| ISL97684 | (ISL97682 - ISL97684) Compact 2-3-4-Ch LED Drivers | Intersil Corporation |
| ISL97686 | 4-Channel LED Driver |  Intersil |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |