CAT4201V-GT3 [ONSEMI]
LED 驱动器,350 mA,步降转换器;型号: | CAT4201V-GT3 |
厂家: | ONSEMI |
描述: | LED 驱动器,350 mA,步降转换器 驱动 显示驱动器 转换器 驱动程序和接口 |
文件: | 总15页 (文件大小:255K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
CAT4201
350mA High Efficiency Step Down LED Driver
FEATURES
DESCRIPTION
LED drive current up to 350mA
The CAT4201 is a high efficiency step-down converter
optimized to drive high current LEDs. A patented
switching control algorithm allows highly efficient and
accurate LED current regulation. A single RSET
resistor sets the full scale LED string current up to
350mA from supplies as high as 36V.
Compatible with 12V and 24V standard systems
Handles transients up to 40V
Single Pin Control and Dimming function
Power Efficiency up to 94%
Drives LED strings of up to 32V
The switching architecture of the CAT4201 results in
extremely low internal power dissipation allowing the
device to be housed in a tiny package without the
need for dedicated heat sinking. The device is
compatible with switching frequencies of up to 1MHz,
making it ideal for applications requiring small footprint
and low value external inductors.
Open and short LED protection
Parallel configuration for higher output current
RoHS-compliant TSOT-23 5-lead package
APPLICATIONS
12V and 24V Lighting Systems
Automotive and Aircraft Lighting
General lighting
Analog dimming and LED shutdown control is
provided via a single input pin, CTRL. Additional
features include overload current protection and
thermal shutdown. The device is available in the low
profile 5-lead thin SOT23 package and is ideal for
space constrained applications.
High Brightness 350mA LEDs
ORDERING INFORMATION
Quantity
per Reel
Package
Marking
Part Number
CAT4201TD-GT3
* Plated Finish: NiPdAu
3000
TF
For Ordering Information details, see page 14.
PIN CONFIGURATION
TYPICAL APPLICATION CIRCUIT
Bulb Replacement
VBAT
TSOT-23 5-lead
9V
C1
1
2
3
5
CTRL
GND
VBAT
SW
4.7µF
D
C2
CAT4201
VBAT
CAT4201
300mA
10µF
4
RSET
RSET
R1
L
CTRL
SW
(Top View)
10kΩ
22µH
GND
D: Central Schottky CMDSH05-4
L: Sumida CDRH6D26-220
See Table 1 on page 6 for external component selection.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
1
Doc. No. MD-5025 Rev. E
CAT4201
ABSOLUTE MAXIMUM RATINGS(1)
Parameters
Ratings
-0.3 to +40
-0.3 to +5
1
Units
V
VBAT, SW, CTRL
RSET
V
Switch SW peak current
Storage Temperature Range
Junction Temperature Range
Lead Temperature
A
-65 to +160
-40 to +150
300
°C
°C
°C
RECOMMENDED OPERATING CONDITIONS
Parameters
VBAT voltage (2) (3)
Ratings
6.5 to 36 (2)
0 to 36
Units
V
V
SW voltage
-40 to +125
50 to 350
50 to 1000
Ambient Temperature Range
LED Current
°C
mA
kHz
Switching Frequency
ELECTRICAL CHARACTERISTICS
VIN = 13V, ambient temperature of 25ºC (over recommended operating conditions unless specified otherwise)
Symbol
Parameter
Conditions
Min
Typ
Max Units
Operating Supply Current on
VBAT pin
IQ
0.4
1
mA
Idle Mode Supply Current on
VBAT pin
ISD
CTRL = GND
90
µA
V
VFB
RSET Pin Voltage
2 LEDs with ILED= 300mA
1.15
270
1.2
1.25
330
R1 = 33kꢀ
R1 = 10kꢀ
R1 = 8.25kꢀ
100
300
350
ILED
Programmed LED Current
mA
CTRL Voltage for 100%
Brightness
VCTRL-FULL
VCTRL-EN
VCTRL-SD
ICTRL
2.6
0.9
0.9
3.1
1.2
V
V
CTRL Voltage to Enable
LEDs
LED enable voltage threshold
LED disable voltage threshold
CTRL Voltage to Shutdown
LEDs
0.4
V
VCTRL = 3V
VCTRL = 12V
µA
40
200
80
CTRL pin input bias
RSW
TSD
THYST
η
Switch “On” Resistance
Thermal Shutdown
Thermal Hysteresis
Efficiency
ISW = 300mA
0.9
150
20
1.5
ꢀ
ºC
ºC
%
Typical Application Circuit
86
Notes:
(1) Stresses above those listed under “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 outside of those listed in the operational sections of this
specification is not implied. Exposure to any absolute maximum rating for extended periods may affect device performance and reliability.
(2) The VBAT pin voltage should be at least 3V greater than the total sum of the LED forward voltages in order to operate at nominal LED
current.
(3) During power-up, the slew rate of the input supply should be greater than 1µs for every 5V increase of VBAT.
Doc. No. MD-5025 Rev. E
2
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4201
TYPICAL OPERATION CHARACTERISTICS
VIN = 13V, ILED = 300mA, L = 22μH, C1= 4.7μF, C2 = 10μF, TAMB = 25°C unless otherwise specified
Input Operating Supply Current
Idle Mode Supply Current (CTRL = 0V)
1.0
200
150
100
50
0.8
0.6
0.4
0.2
0.0
0
8
10 12 14 16 18 20 22 24
INPUT VOLTAGE [V]
0
4
8
12 16
20 24
INPUT VOLTAGE [V]
CTRL Input Bias Current
RSET Voltage vs. Temperature
250
1.30
VIN = 13V
200
150
100
50
1.25
1.20
1.15
1.10
0
-40
0
40
80
120
0
2
4
6
8
10
12
TEMPERATURE [°C]
CTRL VOLTAGE [V]
RSET Voltage vs. CTRL Voltage
LED Current vs. RSET
1.4
400
300
200
100
0
1.2
1.0
0.8
0.6
0.4
0.2
0.0
+25°C
-40°C
+ 85°C
5
10 15 20 25 30 35
0
1
2
3
4
RSET [kꢀ]
CTRL VOLTAGE [V]
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
3
Doc. No. MD-5025 Rev. E
CAT4201
TYPICAL OPERATION CHARACTERISTICS
VIN = 13V, ILED = 300mA, L = 22μH, C1= 4.7μF, C2 = 10μF, TAMB = 25°C unless otherwise specified
Switching Frequency vs. Input Voltage (2 LEDs)
Switching Frequency vs. Input Voltage (1 LED)
700
600
500
400
300
200
100
0
500
150mA
300mA
400
150mA
300
200
300mA
100
0
8
12
16
20
24
28
8
12
16
20
24
28
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
Switching Frequency vs. Temperature
Switch ON Resistance vs. Input Voltage
500
2
VIN = 13V
1.6
1.2
0.8
0.4
0
150mA
400
300
300mA
200
100
-40
0
40
80
120
8
10 12 14 16 18 20 22 24
INPUT VOLTAGE [V]
TEMPERATURE [°C]
Efficiency vs. Input Voltage (2 LEDs)
Efficiency vs. Input Voltage (1 LED)
100
100
150mA
95
95
90
90
150mA
85
85
300mA
80
80
75
70
300mA
75
70
8
10 12 14 16 18 20 22 24
INPUT VOLTAGE [V]
8
10 12 14 16 18 20 22 24
INPUT VOLTAGE [V]
Doc. No. MD-5025 Rev. E
4
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4201
TYPICAL OPERATION CHARACTERISTICS
VIN = 13V, ILED = 300mA, L = 22μH, C1= 4.7μF, C2 = 10μF, TAMB = 25°C unless otherwise specified
LED Current Regulation vs. Temperature
Efficiency vs. LED Current
10
100
95
90
85
80
75
70
VIN = 13V
8
6
4
2 LEDs
2
0
-2
-4
-6
-8
-10
1 LED
100 150 200 250 300 350
LED CURRENT [mA]
-40
0
40
80
120
TEMPERATURE [°C]
LED Current vs. Input Voltage (2 LEDs)
LED Current vs. Input Voltage (1 LED)
350
350
VF = 3.3V
VF = 3.3V
300
300
300mA
250
300mA
250
200
200
VF = 3.1V
150
VF = 3.1V
150
150mA
150mA
100
100
50
0
50
0
0
4
8
12 16 20 24 28
0
4
8
12 16 20 24 28
INPUT VOLTAGE [V]
INPUT VOLTAGE [V]
Switching Waveforms
CTRL Power-up
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
5
Doc. No. MD-5025 Rev. E
CAT4201
TYPICAL OPERATION CHARACTERISTICS
VIN = 13V, ILED = 300mA, L = 22μH, C1= 4.7μF, C2 = 10μF, TAMB = 25°C unless otherwise specified
RSET Transient Response
Line Transient Response (10V to 13V)
EXTERNAL COMPONENT SELECTION
Table
1
provides the recommended external
relative to the LED current accuracy, LED ripple
current, switching frequency and component size.
components L and C2 that offer the best performance
1 LED
2 LEDs
LED current
(mA)
L inductor
(µH)
C2 Capacitor
(µF)
L inductor
(µH)
C2 Capacitor
(µF)
10
22
33
47
2.2
4.7
4.7
10
≥150
22
47
4.7
2.2
< 150
Table 1. External Component Selection
Note: Larger C2 capacitor values allow to reduce further the LED ripple current if needed.
Doc. No. MD-5025 Rev. E
6
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4201
PIN DESCRIPTION
Pin Name Function
1
2
3
4
5
CTRL Analog dimming control and shutdown pin.
GND Ground reference.
RSET RSET pin. A resistor connected between the pin and ground sets the average LED current.
SW Interface to the inductor.
VBAT Supply voltage for the device.
PIN FUNCTION
VBAT is the supply input to the device. Typical current
conduction into this pin is less than 1mA and voltage
transients of up to 40V can be applied. To ensure
accurate LED current regulation, the VBAT voltage
should be 3V higher than the total forward voltage of
the LED string. A bypass capacitor of 4.7µF or larger
is recommended between VBAT and GND.
GND is the ground reference pin. This pin should be
connected directly to the ground plane on the PCB.
SW pin is the drain terminal of the internal low
resistance high-voltage power MOSFET. The inductor
and the Schottky diode anode should be connected to
the SW pin. Voltages of up to 40V can be safely
handled on the SW pin. Traces going to the SW pin
should be as short as possible with minimum loop
area. The device can handle safely “open-LED” or
“shorted-LED” fault conditions.
CTRL is the analog dimming and control input. An
internal pull-down current of 20µA allows the LEDs to
shutdown if CTRL is left floating. Voltages of up to
40V can be safely handled by the CTRL input pin.
RSET pin is regulated at 1.2V. A resistor connected
between the RSET pin and ground sets the LED full-
scale brightness current. The external resistance
value and the CTRL pin voltage determine the LED
current during analog dimming.
When the CTRL voltage is less than 0.9V (typ), the
LEDs will shutdown to zero current. When the CTRL
voltage is greater than about 2.6V, full scale
brightness is applied to the LED output. At voltages of
less than around 2.6V, the LED current is
progressively dimmed until shutdown.
For lamp replacement applications, or applications
where operation in dropout mode is expected, it is
recommended that the CTRL pin voltage be derived
from the LED cathode terminal.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
7
Doc. No. MD-5025 Rev. E
CAT4201
SIMPLIFIED BLOCK DIAGRAM
12V/24V
VBAT
30kꢀ
CTRL
7V
20µA
OFF-Time Control
SW
EN
PWM
Controller
ON-Time Control
1.2V
Reference
EN
+
–
R
2
1ꢀ
1.2V
RSET
GND
Figure 1. CAT4201 Simplified Block Diagram
BASIC OPERATION
LED Pin Current
The CAT4201 is a high efficiency step-down regulator
designed to drive series connected high-power LEDs.
LED strings with total forward voltages of up to 32V
can be driven with bias currents of up to 350mA.
The LED current is set by the external RSET resistor
connected to the regulated output of the RSET pin. An
overall current gain ratio of approximately 2.5A/mA
exists between the average LED current and the
RSET current, hence the following equation can be
used to calculate the LED current.
During the first switching phase, an integrated high
voltage power MOSFET allows the inductor current to
charge linearly until the peak maximum level is
reached, at which point the MOSFET is switched off
and the second phase commences, allowing the
inductor current to then flow through the Schottky
diode circuit and discharge linearly back to zero
current.
LED Current (A) ≅ 2.5 x VRSET (V) / RSET (kꢀ)
Table 2 lists the various LED currents and the
associated RSET resistors.
LED current (A)
RSET (kΩ)
0.10
0.15
0.20
0.25
0.30
0.35
33
21
The switching architecture ensures the device will
always operate at the cross-over point between
Continuous Conduction Mode (CCM) and Discon-
tinuous Conduction Mode (DCM). This operating
mode results in an average LED current which is
equal to half of the peak switching current.
15
12
10
8.25
Table 2. RSET Resistor Selection
Doc. No. MD-5025 Rev. E
8
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4201
APPLICATION INFORMATION
L
(µH)
I rated
(A)
LED current
(A)
Input Voltage Range
Part Number
The minimum supply voltage required to maintain
adequate regulation is set by the cathode terminal
voltage of the LED string (i.e the VBAT voltage minus
the LED string voltage). When the LED cathode
terminal falls below 3V, a loss of regulation occurs.
CDRH6D26-100
CDRH6D26-220
CDRH6D28-330
CDRH6D28-470
CDRH6D28-560
10
22
33
47
56
1.5
1.0
0.35
0.35
0.35
0.35
0.35
0.92
0.8
For applications which may occasionally need to
experience supply “dropout” conditions, it is
recommended that the CTRL input be used to sense
the LED cathode voltage. The CTRL pin can either be
tied directly to the cathode terminal (for Lamp
Replacement) or connected via a pass-transistor for
PWM lighting applications.
0.73
Table 3. Sumida inductors
Capacitor Selection
A 10μF ceramic capacitor C2 across the LED(s)
keeps the LED ripple current within ± 15% of nominal
for most applications. If needed, a larger capacitor can
be used to further reduce the LED current ripple. Any
resistance in series with the LED (0.5Ω or more)
contributes to reduce the ripple current. The capacitor
voltage rating should be equivalent to the maximum
expected supply voltage so as to allow for “Open-
LED” fault conditions. The capacitor value is
independent of the switching frequency or the overall
efficiency.
Figure 2 shows the regulation performance obtained
in dropout, when the CTRL pin is configured to sense
the LED cathode voltage.
400
300
300mA
A 4.7μF ceramic input capacitor C1 is recommended
to minimize the input current ripple generated on the
supply. Using a larger capacitor value further reduces
the ripple noise appearing on the supply rail.
200
150mA
100
If
a
constant capacitance is needed across
temperature and voltage, X5R or X7R dielectric
capacitors are recommended.
0
0
1
2
3
4
5
6
Schottky Diode
CTRL VOLTAGE [V]
The peak repetitive current rating of the Schottky
diode must be greater than the peak current flowing
through the inductor. Also the continuous current
rating of the Schottky must be greater than the
average LED current. The voltage rating of the diode
should be greater than the peak supply voltage
transient preventing any breakdown or leakage.
Central Semiconductor Schottky diode CMDSH05-4
(40V, 500mA rated) is recommended. Schottky diodes
rated at 400mA (or higher) continuous current are fine
for most applications.
Figure 2. “Dropout” configured LED Current
(as shown in Typical Application on page 1)
Inductor Selection
For 350mA LED current drive levels, a 22µH inductor
value is recommended to provide suitable switching
frequency across a wide range of input supply values.
For LED current of 150mA or less, a 33µH or 47µH
inductor is more suitable.
The inductor must have a maximum current rating
which equals or exceeds twice the programmed LED
current. For example, when driving LEDs at 350mA,
an inductor with at least 700mA current rating must be
used. Minor improvements in efficiency can be
achieved by selecting inductors with lower series
resistance.
Note: Schottky diodes with extremelly low forward voltages (VF) are
not recommended, as they may cause an increase in the
LED current.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
9
Doc. No. MD-5025 Rev. E
CAT4201
Dimming Methods
VBAT
12V
Two methods for PWM dimming control on the LEDs
are described below. The first method is to PWM on
the control pin, the other method is to turn on and off a
second resistor connected to the RSET pin and
connected in parallel with R1.
C1
4.7µF
D
C2
VBAT
CAT4201
10µF
RSET
L
PWM on CTRL Pin
R1
10kꢀ
SW
CTRL
A PWM signal from a microprocessor can be used for
dimming the LEDs when tied to the CTRL pin. The
duty cycle which is the ratio between the On time and
the total cycle time sets the dimming factor. The
recommended PWM frequency on the CTRL pin is
between 100Hz and 2kHz.
22µH
R2
GND
Q1
NPN
PWM
control
R4
1kꢀ
5V
0V
1kꢀ
R5
47kꢀ
Figure 5. Circuit for PWM on CTRL
PWM on RSET Pin
Another dimming method is to place in parallel to R1
another resistor with a FET in series, as shown on
Figure 6. R1 sets the minimum LED current corres-
ponding to 0% duty cycle. The combined resistor of
R1 and Rmax sets the maximum LED current
corresponding to 100% duty cycle.
VBAT
13V
4.7µF
C1
D
C2
Figure 3. PWM at 1kHz on CTRL Pin
VBAT
CAT4201
10µF
RSET
L
Rmax
R1
300
250
200
150
100
50
SW
CTRL
22µH
R2
GND
Q1
PWM
control
NPN
1kꢀ
OFF ON
Figure 6. Circuit for PWM on RSET
0
100
80
60
40
20
0
DUTY CYCLE [%]
Figure 4. LED Current vs. Duty Cycle
Doc. No. MD-5025 Rev. E
10
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4201
Operation from high supply voltage above 14V
Parallel configuration for driving LEDs beyond
350mA
For operation from a supply voltage above 14V, it is
recommended to have a slew rate of 1µs or more for
every 5V increase in VBAT supply. When using a high
supply voltage of 24V, a 1ꢀ or 2ꢀ resistor in series
with the supply, as shown on Figure 7, is
recommended to limit the slew rate of the supply
voltage. A 4.7µF minimum ceramic capacitor is placed
between the VBAT pin and ground. The combination
of the series resistor R3 and input capacitor C1 atcs
as a low pass filter limiting the excessive in-rush
currents and overvoltage transients which would
otherwise occur during “hot-plug” conditions, thereby
protecting the CAT4201 driver.
Several CAT4201 devices can be connected in
parallel for driving LEDs with current in excess of
350mA. The CAT4201 driver circuits are connected to
the same LED cathode. Figure
9 shows the
application schematic for driving 1A into one LED with
three CAT4201 connected in parallel. Each CAT4201
is driving the LED with a current set by its RSET
resistor. The resulting LED current is equal to the sum
of each driver current.
R5
VIN
C1
1ꢀ
C4
10µF
U1
4.7µF
D1
VBAT
VBAT R3
1A
CAT4201
RSET
24V
1ꢀ
C1
R1
L1
R4
CTRL
SW
SW
SW
4.7µF
8.3kꢀ
D1
22µH
C2
GND
1kꢀ
VBAT
CAT4201
4.7µF
RSET
R1
L
300mA
CTRL
SW
10kꢀ
C2
33µH
GND
U2
4.7µF
R1
D2
VBAT
CAT4201
RSET
1kꢀ
R2
L2
Figure 7. 24V Application with 5 LEDs
CTRL
8.3kꢀ
22µH
GND
Operation from high supply voltage of 36V
When powering from a high supply voltage of 36V, a
2ꢀ resistor in series with the supply is recommended,
as shown on Figure 8, to limit the slew rate of the
supply voltage.
C3
U3
4.7µF
D3
VBAT
CAT4201
RSET
VBAT R3
R3
L3
36V
2ꢀ
C1
CTRL
8.3kꢀ
22µH
GND
4.7µF
D1
C2
VBAT
CAT4201
2.2µF
RSET
Figure 9. Three CAT4201 in Parallel for 1A LED
R1
L
300mA
CTRL
SW
10kꢀ
47µH
GND
R2
1kꢀ
Figure 8. 36V Application with 6 LEDs
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
11
Doc. No. MD-5025 Rev. E
CAT4201
Open LED Behavior
Board Layout
If the LEDs are not connected, the CAT4201 stops
switching and draws very little current.
In order to minimize EMI and switching noise, the
Schottky diode, the inductor and the output capacitor
C2 should all be located close to the driver IC. The
input capacitor C1 should be located close to the
VBAT pin and the Schottky diode cathode. The
CAT4201 ground pin should be connected directly to
the ground plane on the PCB. A recommended PCB
layout with component location is shown on Figure 11.
The LEDs are connected by two wires tied to both
sides of the output capacitor C2. The LEDs can be
located away from the driver if needed.
At power-up with no load connected, the capacitor C2
is charged-up by the CAT4201. As soon as the bottom
side of the capacitor (C2-) reaches 0 volt, as shown
on Figure 10, the CAT4201 stops switching and
remains in the idle mode only drawing about 0.4mA
current from the supply.
Figure 10. Open LED mode
Figure 11. Recommended PCB Layout
In order to further reduce the ripple on the supply rail,
an optional Pi style filter (C-L-C) can be used. A 10µH
inductor rated to the maximum supply current can be
used.
Doc. No. MD-5025 Rev. E
12
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4201
PACKAGE OUTLINE DRAWING
TSOT-23 5-LEAD (TD)(1)(2)
SYMBOL
MIN
NOM
MAX
1.00
0.10
0.90
0.45
0.20
D
A
A1
A2
b
e
0.01
0.80
0.30
0.12
0.05
0.87
c
0.15
D
2.90 BSC
2.80 BSC
1.60 BSC
0.95TYP
0.40
E1
E
E
E1
e
L
0.30
0º
0.50
8º
L1
L2
θ
0.60 REF
0.25 BSC
TOP VIEW
A2 A
A1
θ
L
b
c
L2
L1
SIDE VIEW
END VIEW
For current Tape and Reel information, download the PDF file from:
http://www.catsemi.com/documents/tapeandreel.pdf.
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC standard MO-193.
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
13
Doc. No. MD-5025 Rev. E
CAT4201
EXAMPLE OF ORDERING INFORMATION(1)
Prefix
Device #
Suffix
CAT
4201
TD
-G
T3
Package
TD: TSOT
Plated Finish
G: NiPdAu
Tape & Reel
T: Tape & Reel
3: 3000/Reel
Company ID
Product Number
4201
ORDERING PART NUMBER
CAT4201TD-GT3
Notes:
(1) All packages are RoHS-compliant (Lead-free, Halogen-free).
(2) The standard plated finish is NiPdAu on all pins.
(3) The device used in the above example is a CAT4201TD-GT3 (TSOT-23, NiPdAu, Tape & Reel).
(4) For additional package and temperature options, please contact your nearest ON Semiconductor Sales office.
Doc. No. MD-5025 Rev. E
14
© 2008 SCILLC. All rights reserved.
Characteristics subject to change without notice
CAT4201
REVISION HISTORY
Date
Revision Reason
24-Jul-07
A
B
Initial Issue
Updated Typical Application Circuit
Added “External Component Selection” Table
Added “Capacitor Selection” information
Updated Figures 5, 6, 7, 8
02-Aug-07
Update Description, change patent-pending to patented
Update Package Outline Drawing
21-Feb-08
C
17-Jun-08
17-Nov-08
D
E
Update Supply Voltage
Change logo and fine print to ON Semiconductor
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