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PDF CAT4106 Data sheet ( Hoja de datos )
| Número de pieza | CAT4106 | |
| Descripción | 6W Quad Channel DC/DC LED Driver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CAT4106 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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CAT4106
6 W Quad Channel DC/DC
LED Driver with Diagnostics
Description
The CAT4106 is an integrated multi−channel LED driver and high
power DC/DC converter suitable for powering backlighting
applications up to a total of 6 watts. Up to four matched LED strings
can be accurately programmed with uniform drive current set by a
single external resistor. Each output channel is suitable for LED string
voltages of up to 36 V. The driver automatically adjusts the output
voltage to drive the highest forward voltage string with the minimum
headroom voltage maximizing the efficiency.
High resolution dimming control is achieved by the EN/PWM logic
pin which supports multiple frequencies. This ensures precise PWM
dimming control while the device remains fully biased. In addition,
when held at logic low, the device to enter a full shutdown “zero”
current mode.
External programming resistors set the minimum and maximum
voltage limits for the acceptable “window of operation” for LED
strings. Any channel which fails to regulate within the window (Open
or Short LED) is detected and flagged on the FAULT logic output
(active low, open−drain).
The device is available in a 16−lead TQFN 4 mm x 4 mm and
TSSOP with exposed pad packages.
Features
• Four LED Channels with Tight Current Matching
• Integrated DC/DC Boost Converter
• Up to 6 W LED Total Output Power
• Up to 92% Efficiency
• Low Dropout LED Channels (500 mV at 175 mA)
• High Frequency PWM Interface (up to 2 kHz)
• Adjustable Short/Open LED Detection
• Programmable LED Channel Current
• Adjustable LED Channel Voltage
• Thermal Shutdown Protection
• 16−lead TQFN 4 x 4 mm and TSSOP Packages
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Applications
• LCD Backlight Lighting
• Automotive and General Purpose Lighting
© Semiconductor Components Industries, LLC, 2014
June, 2014 − Rev. 4
1
http://onsemi.com
1
TQFN−16
HV4 SUFFIX
CASE 510AE
1
TSSOP−16
YP SUFFIX
CASE 948AP
LED1
GND
FAULT
PGND
FB
SW
EN/PWM
NC
PIN CONNECTIONS
1
TAB
is
GND
LED2
LED3
LED4
RSET
VFMAX
VFMIN
CTRL
VIN
LED1
GND
FAULT
PGND
1
TAB
is
GND
VFMAX
VFMIN
CTRL
VIN
(Top Views)
MARKING DIAGRAMS
4106Y
CDAL
CDAL = CAT4106HV4−GT2
4106Y = CAT4106YP−T2
ORDERING INFORMATION
Device
CAT4106HV4−GT2
(Note 1)
Package
TQFN−16
(Pb−Free)
Shipping
2,000/
Tape & Reel
CAT4106YP−T2
(Note 1)
TSSOP−16
2,000/
(Pb−Free) Tape & Reel
1. NiPdAu Plated Finish (RoHS−compliant)
2. Matte−Tin Plated Finish (RoHS−compliant)
Publication Order Number:
CAT4106/D
1 page  
CAT4106
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
(VIN = 5 V, VL = 12 V, TAMB = 25°C, typical application circuit unless otherwise specified.)
0.9 30
0.8 25
0.7 20
0.6 15
0.5
0.4
3.0
3.5
R2 = R3 = 24 kW
4.0 4.5
5.0
5.5
VIN SUPPLY (V)
Figure 9. LED Channel Voltage vs. VIN Supply
10
5
3.0
3.5
4.0 4.5
5.0 5.5
VIN SUPPLY (V)
Figure 10. FAULT Drive RDSON vs. VIN Supply
2.0 1.2
1.5 1.1
1.0 1.0
0.5 0.9
0
3.0 3.5 4.0 4.5 5.0 5.5
VIN SUPPLY (V)
Figure 11. Switch Resistance vs. VIN Supply
1200
1100
1000
900
800
700
600
3.0 3.5 4.0 4.5 5.0 5.5
VIN SUPPLY (V)
Figure 13. Switching Current Limit vs. VIN
Supply
0.8
3.0
3.5
4.0 4.5
5.0
VIN SUPPLY (V)
Figure 12. Switching Frequency vs. VIN
Supply
5.5
5
4
3
2
1
0
3.0 3.5 4.0 4.5 5.0 5.5
VIN SUPPLY (V)
Figure 14. Powerdown Delay vs. VIN Supply
http://onsemi.com
5
5 Page 
CAT4106
The external resistor R6 value needed to set a VFMIN
level of 18 V is calculated as follows:
ǒ ǓR6 + R7
18
1.2
V
V
*
1
For R7 = 20 kW, R6 = 280 kW.
Setting VFMAX Level (Open−LED)
The VFMAX level represents the maximum level expected
for the LED string voltage “window of operation”. This
voltage setting is based on the number of series LEDs being
used and the expected maximum VF during normal operation.
Example: Consider a string of 6 LEDs in series, with each
LED having a VF range of 3.5 V ± 0.5 V. Since the
maximum VF of each LED is 4.0 V, the overall maximum
expected string voltage would be 24 V. Any string voltage
which appears greater than 24 V would be considered as
containing an open−circuit in one or more of the series
LEDs. The external resistor R4 value needed to set a
VFMAX level of 24 V is calculated as follows:
ǒ ǓR4 + R5
24 V
1.2 V * 1
For R5 = 20 kW, R4 = 380 kW.
In normal operation, the LED string which has the largest
VF will be used to set the VCTRL/VFB voltage levels. If the
largest string voltage tries to exceed VFMAX setting, it will
no longer be allowed to control the voltage level of
VCTRL/VFB (i.e. it will be ignored) and subsequently the
next largest LED string voltage will then be used in the
control loop. All remaining functional LED channels will
continue to operate as normal. If a disconnected LED string
is reconnected, the FAULT flag remains on and the channel
disabled until the device has been re−enabled with the EN
pin going from low to high.
If all LED channels are detected as being open−circuit,
then the boost converter will limit the output voltage to the
VFMAX setting. This eliminates the need for an external
protection zener.
Enable and PWM Dimming Control
EN/PWM input signal provides two independent
functions. The first function is to enable and disable the
entire device. The second function is to apply PWM
dimming on the output channels while the chip remains fully
enabled. Applying logic high on the EN/PWM input will
power up the device. The device will continue to remain
powered up, even in the presence of PWM signals being
applied. To disable the device into complete system
shutdown mode, a logic low must be applied to the
EN/PWM input for typically 5 ms.
The duty cycle applied at the EN/PWM is directly applied
to all the output channels. Each time the input is taken low,
all output channels will immediately be switched off and the
channels will resume normal operation when the PWM is
taken back high. The response time of the channels when
switching ON or OFF is typically 0.2 ms.
During PWM dimming, the recommended minimum
pulse width interval (either High or Low) is 0.2 ms. The
recommended maximum pulse width during PWM
dimming is 2.0 ms, however this only applies to the Low
pulse interval. Pulse durations extending past 2.0 ms may
cause the device to enter full shutdown mode. The LED
channel response time is longer if the device has been in
shutdown mode.
For most applications, a maximum dimming resolution
can be achieved with PWM clock frequencies in the range
of 500 Hz to 2 kHz. Pulse width intervals of 1 ms, allows up
to 1000:1 dimming ratio at 1 kHz PWM frequency.
One or Two LED String Applications
The CAT4106 can be used to drive one or two strings of
LEDs by connecting together some LED pins. Also for
applications requiring LED current greater than 175 mA,
LED channels can be tied together, assuming the supply is
suitable to drive the load. Figure 27 shows a typical
application for driving a single string of LEDs. Note:
VFMIN is disabled for one string.
VL L D
C2
VIN
C1
C3
VIN SW VFMAX
VFMIN
CAT4106
R4 R6
R5 R7
OFF... ON... DIM...
EN/PWM
LED1
RSET
R2
LED2
LED3
VCTRL
LED4
FB
GND
FAULT
PGND
R8
VIN
R1 R3
LED Fault Detection
(open drain pull−down)
Figure 27. Application Circuit for One LED String
Figure 28 shows a typical application for driving two
strings of LEDs. The LED current is equal to two times the
channel current.
VL L D
C2 C3
VIN
C1
R4 R6
VIN SW VFMAX
VFMIN
CAT4106
R5 R7
OFF... ON... DIM...
EN/PWM LED1
RSET
R2
VCTRL
LED2
LED3
LED4
FB
FAULT
GND PGND
VIN
R8
R1 R3
LED Fault Detection
(open drain pull−down)
Figure 28. Application Circuit for Two LED Strings
http://onsemi.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet CAT4106.PDF ] | |
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