TI TPS92550

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TPS92550
450mA 14W Constant Current Buck LED Driver MicroModule
General Description
Package Highlights
The TPS92550 Constant Current Buck LED Driver MicroModule drives maximum 450mA LED current up to 10 LEDs
in a single string (maximum 14W). It integrates all the power
components including the power inductor. The TPS92550
provides a full turn-key, highly efficient solution for wide range
of single string LED lighting applications with up to 96% power
efficiency. It accepts an input voltage ranging from 4.5V to
36V and delivers a 350mA LED current as default. The LED
current is adjustable from 300mA to 450mA by changing a
single external resistor.
The module operates at constant switching frequency
(400kHz) with low Electro Magnetic Interference (EMI) complying with EN55015 standard. The module has fast control
loop to realize fine LED current pulse yielding 256–step PWM
dimming resolution at 240Hz for general lighting. Protection
feature include thermal shutdown, input under-voltage lockout, LED open-circuit and short-circuit protections. The
TPS92550 Micro-Module is available in TO-PMOD 7 pin power package.
■ 7 lead easy-to-use package (Similar to TO-263)
■ Single exposed die attach pad for enhancing thermal
Applications
■ General Lighting
Desk Lamps
Cabinet Lamps
Decorative Lamps
Street Lamps
■ Architecture Lighting
Recess Lights
Spot Lights
Underwater Lights
System Performance
Efficiency vs VIN , ILED = 350mA
100
EFFICIENCY (%)
Easy to Use 7 Pin Package
performance
■ 10.2 x 13.8 x 4.6 mm package
8LED
6LED
95
10LED
90
85
30181001
TO-PMOD 7 Pin Package
10.16 x 13.77 x 4.57 mm (0.4 x 0.39 x 0.18 in)
θJA = 20°C/W, θJC = 1.9°C/W (Note 1)
RoHS Compliant
80
20
24
28
VIN (V)
32
36
30181004
Radiated Emissions (EN 55015)
Features
■ Integrated all power components including the power
inductor
■ Wide input voltage range : 4.5V - 36V
■ Constant switching frequency at 400kHz
■ High contrast ratio (Minimum dimming current pulse width
< 16µs)
Drives up to 10 LEDs in series at 36V input
±3.6% typical LED current accuracy
LED current adjustable from 300mA to 450mA
Up to 96% efficiency
Input Under-Voltage Lock-Out (UVLO)
Compatible with ceramic and low ESR capacitors
Low Electro Magnetic Interference(EMI) complies with
EN55015 standard (Note 2)
■ LED open and short circuit protections
■ Thermal shutdown and RoHS compliant
■ –40˚C to +125˚C junction temperature range
■
■
■
■
■
■
■
© 2012 Texas Instruments Incorporated
301810 SNVS806A
30181031
LED Current with PWM Dimming
16us dimming pulse
ILED(200mA/DIV)
VDIM(2V/DIV)
4 μs/DIV
30181054
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TPS92550 450mA 14W Constant Current Buck LED Driver Micro-Module
May 17, 2012
TPS92550
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Typical Application Circuit
30181046
Connection Diagram
30181026
Top View
7-Lead TO-PMOD
Ordering Information
Order Number
Supplied As
TPS92550TZE
45 Units in a Rail
TPS92550TZ
250 Units in Tape and Reel
TPS92550TZX
500 Units in Tape and Reel
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Package Type
NSC Package Drawing
Package Marking
TO-PMOD-7
TZA07A
TPS92550TZ
2
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TPS92550
Pin Descriptions
Pin
Number
Name
Description
1,2
LED+
Anode of LED string
Supply input and rail connection to the anode of the LED string.
3
DIM
Dimming signal input
Dimming control signal input. Open to enable or apply logic level PWM
signal to control the brightness of the LED string.
4
GND
Ground
Reference point for all stated voltages. Connect to the exposed pad of
the package externally.
5
VREF
Voltage reference
Internal voltage reference output.
6
IADJ
LED current adjustment
Fine tunning of the LED current by connecting a resistor between this pin
and ground. Connect this pin to ground for factory preset current.
7
LED-
Cathode of LED string
The current return pin of the LED string, connect to the cathode of the
LED string.
EP
Exposed Pad Exposed thermal pad
Function
Used to dissipate heat from the package during operation. Must connect
to GND directly.
3
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TPS92550
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Junction Temperature
Storage Temperature Range
Peak Reflow Case Temperature (30 sec)
Absolute Maximum Ratings (Note 3)
If Military/Aerospace specified devices are required,
please contact the Texas Instruments Sales Office/
Distributors for availability and specifications.
LED+, LED- to GND
DIM to GND
IADJ, VREF to GND
ESD Susceptibility (Note 4)
Power Dissipation
-0.3V to 40V
-0.3V to 6V
-0.3V to 5V
±2 kV (All pins
Except Pin 6)
Internally
Limited
Operating Ratings
150°C
0°C to 150°C
245°C
(Note 3)
LED+, LEDDIM
IADJ
Junction Temperature (TJ)
4.5V to 36V
0V to 5.5V
0V to 0.2V
–40°C to 125°C
Electrical Characteristics Limits in standard type are for TJ = 25°C unless otherwise stated; limits in boldface
type apply over the operating junction temperature range TJ of –40°C to 125°C. Minimum and maximum limits are guaranteed
through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are
provided for reference purposes only. Unless otherwise stated the following conditions apply: VIN =24 V, ILED = 350mA. VIN is the
voltage applied across LED+ and GND. IIN is the input current flowing into the LED+ node. ILED is a LED current flowing into the
LED- pin. VLED is the voltage applied across LED+ and LED-. VDIM is the voltage applied across the DIM pin to ground. Resistor
RIADJ connect from IADJ pin to ground. Resistor RVREF connect from VREF pin to ground.
Symbol
Parameter
Min
(Note 5)
Typ
(Note 6)
VLED = 0V
2.0
2.35
2.7
mA
VLED = 18V
336
350
361
mA
328
350
361
328
350
370
332
350
359
330
350
359
330
350
366
Conditions
Max
Units
(Note 5)
SYSTEM PARAMETERS
IIN
Input Current
ILED
LED Current
4.5V ≤ VIN ≤ 36V
VDIM = 0V
RIADJ = 0Ω
RVREF = open
TJ = 25°C
VLED = 18V
RIADJ = 0Ω
RVREF = open
TJ = 25°C to 125°C
VLED = 18V
RIADJ = 0Ω
RVREF = open
TJ = –40°C to 125°C
ILED–36V
LED Current at VIN = 36V
VIN = 36V
VLED = 24V
RIADJ = 0Ω
RVREF = open
TJ = 25°C
VIN = 36V
VLED = 24V
RIADJ = 0Ω
RVREF = open
TJ = 25°C to 125°C
VIN = 36V
VLED = 24V
RIADJ = 0Ω
RVREF = open
TJ = –40°C to 125°C
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4
mA
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Parameter
Conditions
Min
(Note 5)
Typ
(Note 6)
Max
Units
(Note 5)
ILED-ADJ1
Adjusted LED Current
VLED = 18V
432
450
466
429
450
466
429
450
474
287
300
309
283
300
309
283
300
315
800
900
1020
mA
1.2
µA
400
450
kHz
1.0
1.2
V
mA
RIADJ = 0Ω
RVREF = 10.5kΩ
TJ = 25°C
VLED = 18V
RIADJ = 0Ω
RVREF = 10.5kΩ
TJ = 25°C to 125°C
VLED = 18V
RIADJ = 0Ω
RVREF = 10.5kΩ
TJ = –40°C to 125°C
ILED-ADJ2
Adjusted LED Current
VLED = 18V
mA
RIADJ = 500Ω
RVREF = open
TJ = 25°C
VLED = 18V
RIADJ = 500Ω
RVREF = open
TJ = 25°C to 125°C
VLED = 18V
RIADJ = 500Ω
RVREF = open
TJ = –40°C to 125°C
ILED-SHORT
ILED-LEAK
fSW
LED Short Circuit Current at VIN = 36V
VLED = 0V
VIN = 36V
DIM = open
“LED-” pin leakage current
VLED = 0V
VIN = operating max
DIM = 0V
Switching Frequency
VLED = 12V
365
RIADJ = 0Ω
RVREF = open
VDIM
DIM Pin Threshold
VDIM-HYS
DIM Pin Hysteresis
VDIM Increasing
0.25
V
THERMAL CHARACTERISTICS
TSD
TSD-HYS
θJA
θJC
Thermal Shutdown Temperature
TJ Rising
170
°C
Thermal Shutdown Temp. Hysteresis
TJ Rising
10
°C
Junction to Ambient (Note 1)
4 Layer JEDEC Printed
Circuit Board, 100 vias,
No air flow
19.3
°C/W
2 Layer JEDEC PCB, No
air flow
21.5
No air flow
1.9
Junction to Case
°C/W
Note 1: θ JA measured on a 1.705” x 3.0” four layer board, with one ounce copper , thirty five 12 mil thermal vias, no air flow, and 1W power dissipation.
Note 2: EN 55015 , refer to Figure 4 and 5.
Note 3: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 4: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor into each pin. The Pin 6 ( IADJ pin) pass ± 1kV.Test method is per
JESD22-AI14S.
5
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TPS92550
Symbol
TPS92550
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Note 5: Min and Max limits are 100% production tested at an ambient temperature (TA) of 25°C. Limits over the operating temperature range are guaranteed
through correlation using Statistical Quality Control (SQC) methods. Limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Note 6: Typical numbers are at 25°C and represent the most likely parametric norm.
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ILED Regulation vs VIN, ILED = 350mA
Efficiency vs VIN, ILED = 350mA
3
100
3LED
4LED
90
ILED REGULATION (%)
EFFICIENCY (%)
95
85
80
2LED
75
1LED
70
65
60
2
3LED
2LED
1
4LED
0
1LED
-1
-2
-3
0
4
8
12 16 20 24 28 32 36
VIN (V)
0
4
8
12 16 20 24 28 32 36
VIN (V)
30181002
30181003
ILED Regulation vs VIN, ILED = 350mA
Efficiency vs VIN, ILED = 350mA
3
8LED
6LED
95
10LED
ILED REGULATION (%)
EFFICIENCY (%)
100
90
85
80
2
6LED
8LED
1
10LED
0
-1
-2
-3
20
24
28
VIN (V)
32
36
20
24
28
VIN (V)
32
30181004
30181005
Efficiency vs VIN, ILED = 450mA
ILED Regulation vs VIN, ILED = 450mA
3
100
3LED
90
4LED
ILED REGULATION (%)
95
EFFICIENCY (%)
36
85
80
2LED
75
70
1LED
65
60
2
3LED
1
4LED
2LED
0
-1
1LED
-2
-3
0
4
8
12 16 20 24 28 32 36
VIN (V)
0
30181006
4
8
12 16 20 24 28 32 36
VIN (V)
30181007
7
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TPS92550
Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN =
24V, CIN is a 2.2µF 100V X7R ceramic capacitor for driving 2–7 power LEDs with ILED = 350mA. Single LED forward voltage used
is 3.2V. TA = 25°C for efficiency curves and waveforms.
TPS92550
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Efficiency vs VIN, ILED = 450mA
ILED Regulation vs VIN, ILED = 450mA
3
10LED
8LED
6LED
95
ILED REGULATION (%)
EFFICIENCY (%)
100
90
85
80
2
6LED
8LED
1
10LED
0
-1
-2
-3
20
24
28
VIN (V)
32
36
20
24
28
VIN (V)
32
36
30181008
30181009
ILED Regulation vs VIN, ILED = 300mA
Efficiency vs VIN, ILED = 300mA
3
100
3LED
4LED
90
ILED REGULATION (%)
EFFICIENCY (%)
95
85
80
2LED
75
1LED
70
65
60
2
3LED
2LED
1
4LED
0
1LED
-1
-2
-3
0
4
8
12 16 20 24 28 32 36
VIN (V)
0
4
8
12 16 20 24 28 32 36
VIN (V)
30181010
30181011
Efficiency vs VIN, ILED = 300mA
ILED Regulation vs VIN, ILED = 300mA
3
6LED
95
10LED
8LED
ILED REGULATION (%)
EFFICIENCY (%)
100
90
85
80
8LED
1
10LED
0
-1
-2
-3
20
24
28
VIN (V)
32
36
20
30181012
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6LED
2
24
28
VIN (V)
32
36
30181013
8
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TPS92550
LED Current with PWM Dimming
VDIMRising
LED Current with PWM Dimming
VDIMFalling
ILED(200mA/DIV)
ILED(200mA/DIV)
VDIM(2V/DIV)
VDIM(2V/DIV)
2 μs/DIV
2 μs/DIV
30181052
30181053
LED Current with PWM Dimming
16µs dimming pulse
IIN vs VIN
VDIM = 0V
3.0
ILED(200mA/DIV)
TJ=25°C
2.5
IIN (mA)
2.0
VDIM(2V/DIV)
TJ=-40°C
1.5
TJ=125°C
1.0
0.5
0.0
0
4 μs/DIV
4
8
12 16 20 24 28 32 36
VIN (V)
30181054
30181014
ILED vs VIN
3LED
IIN vs VIN
LED = open , DIM = open
450
3.5
TJ=25°C
3.0
400
2.5
2.0
TJ=-40°C
TJ=125°C
ILED (mA)
IIN (mA)
TJ=-40°C
350
1.5
300
TJ=25°C
250
200
TJ=125°C
150
1.0
100
0.5
50
0.0
0
0
4
8
12 16 20 24 28 32 36
VIN (V)
0
30181016
4
8
12 16 20 24 28 32 36
VIN (V)
30181015
9
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ILED vs VIN
VLED = 0V, DIM = open
IIN vs VIN
VLED = 0V, DIM = open
1000
100
TJ=125°C
600
80
IIN (mA)
ILED (mA)
800
TJ=-40°C
400
200
TJ=125°C
60
TJ=-40°C
40
20
TJ=25°C
0
TJ=25°C
0
0
4
8
12 16 20 24 28 32 36
VIN (V)
0
4
8
12 16 20 24 28 32 36
VIN (V)
30181017
30181018
ILED vs Dimming Duty Ratio
ILED vs Dimming Duty Ratio
100
1.0
90
VIN=12V(2LED)
80
60
ILED (%)
ILED (%)
0.8
VIN=24V(4LED)
70
50
40
0.6 VIN=24V(4LED)
0.4
VIN=36V(6LED)
30
VIN=36V(6LED)
20
0.2
10
0
VIN=12V(2LED)
0.0
0 10 20 30 40 50 60 70 80 90 100
DIM DUTY RATIO (%)
0.0
0.2
0.4
0.6
0.8
DIM DUTY RATIO (%)
1.0
30181019
30181020
ILED Regulation vs Temperature
Frequency Deviation vs VIN
(400kHz)
3
2
ILED REGULATION (%)
FREQUENCY DEVIATION (%)
3
TJ=-40°C
1
TJ=25°C
0
-1
TJ=125°C
-2
1
0
VIN=36V(6LED)
-1
-2
VIN=24V(4LED)
-3
-3
8
12
16
20
24
VIN (V)
28
32
-50
36
-25
0
25
50
75
TEMPERATURE (°C)
100 125
30181022
30181021
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VIN=12V(2LED)
2
10
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ILED vs RVREF
RIADJ = 0Ω
350
450
340
425
330
ILED (mA)
ILED (mA)
TPS92550
ILED vs RIADJ
RVREF = open
320
400
375
310
300
350
0
100
200
300
RIADJ (Ω)
400
500
0
30181023
20
40
60
RVREF (kΩ)
80
100
30181024
11
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TPS92550
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Block Diagram
30181027
TABLE 1 Example for ILED Setting
Operation Description
The TPS92550 is a high power floating buck LED driver with
wide input voltage range. It requires no external current sensing elements and loop compensation network. The integrated
power switch enables high output power up to 14W with 450mA LED current.
High speed dimming control input allows precision and high
resolution brightness control for applications which require
fine brightness adjustment.
RIADJ(Ω)
RVREF(Ω)
ILED(mA)
499
OPEN
300
SHORT
OPEN
350
SHORT
10.5k
450
Application Information
SETTING THE LED CURRENT
The TPS92550 requires no external current sensing resistor
for LED current regulation. The average LED current of the
TPS92550 is adjustable from 300mA to 450mA by varying the
resistance of the resistor according to the following equation
and table.
For RVREF = open and RIADJ <=499Ω
For RIADJ = 0 and RVREF >= 10.5kΩ
30181047
FIGURE 1. TPS92550 Application Schematic for ILED
Setting
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The on-time of the internal switch should be no shorter than
400ns. The number of LED (typical forward voltage at 3.2V)
to input voltage is constrained by that as shown in the following table.
No. of LED
Max. VIN(V)
1
20
2 – 10
36
PC Board Layout Considerations
The TPS92550 features an integrated switch current limiting
mechanism to prevent the LEDs from being over-driven. The
switch current limiter is triggered when the switch current is
three times exceeding the current level set by resistor. Once
the current limiter is triggered, the internal power switch turn
OFF for 3.6µs to discharge the inductor until inductor current
reduces back to normal level. The current limiting feature is
exceptionally important to avoid permanent damage of the
TPS92550 application circuit due to short circuit of LED string.
The overall performance of the LED driver is highly depends
on the PCB layout. Poor board layout can disrupt the performance of the TPS92550 and surrounding circuitry by contributing to EMI, ground bounce and resistive voltage drop in
the traces. These can send erroneous signals to the LED
driver resulting in poor regulation and stability. Good layout
can be implemented by following a few simple design rules.
1. Place CIN as close as possible to the VIN pin and GND
exposed pad (EP).
2. Place COUT (optional for reduction of LED current ripple
and EMI compliance) as close as possible to the VLED+
pin and VLED- pin.
3. The exposed pad (EP) must connect to the GND pin
directly.
PWM Dimming Control
EMI Design Considerations
The DIM pin of the TPS92550 is an input with internal pull-up
that accepts logic signals for average LED current control.
Applying a logic high (above 1.2V) signal to the DIM pin or
leaving the DIM pin open will enable the device. Applying a
logic low signal (below 0.7V) to the DIM pin will disable the
switching activity of the device but maintain operation of the
VCC regulator active. The TPS92550 operation of high speed
dimming and very fine dimming control as shown in Figure 2.
From an EMI reduction standpoint, it is imperative to minimize
the di/dt current paths (refer to Figure 3). Therefore, it is essential to connect an 2.2µF capacitor (COUT) across the LED
+ pin and LED- pin. This will minimize the ripple current so
that it can reduce radiated EMI (refer to Figure 4 and 5).
Peak Switch Current Limit
30181030
FIGURE 3. Current Loops
30181029
FIGURE 2. Shortened Current Slew up Time of the
TPS92550
13
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TPS92550
To ensure normal operation of the TPS92550, it is recommended to set the dimming frequency not higher than 1/10 of
the switching frequency. The dim pulse on time is tested down
to 16µs. In applications that require high dimming contrast
ratio, low dimming frequency should be used.
Minimum Switch On-Time
TPS92550
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30181031
FIGURE 4. Complies with EN55015 Radiated Emissions (HORI. / HEIGHT=3.0m / RANGE=10m)
CIN = 2.2uF, COUT = 2.2uF,
VIN = 36V, ILED = 350mA, No. of LED = 10
30181032
FIGURE 5. Complies with EN55015 Radiated Emissions (VERT. / HEIGHT=1.0m / RANGE=10m)
CIN = 2.2uF, COUT = 2.2uF,
VIN = 36V , ILED = 350mA, No. of LED = 10
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TPS92550
TPS92550 Application Circuit Schematic and BOM
30181033
FIGURE 6.
TABLE 1. Bill of Materials, VIN = 18V , ILED = 350mA, No. of LED = 2 — 5
Designator
Description
Case Size
Manufacturer
Manufacturer P/N
Quantity
U1
LED Micro-Module
Driver
TO-PMOD-7
Texas Instruments
TPS92550TZ
1
CIN
2.2 µF, 100V, X7R
1210
Murata
GRM32ER72A225KA35L
1
15
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30181034
FIGURE 7.
TABLE 2. Bill of Materials, VIN = 36V , ILED = 350mA , No.of LED = 10, Complies with EN55015 Radiated Emissions
Designator
Description
Case Size
Manufacturer
Manufacturer P/N
Quantity
U1
LED Micro-Module
Driver
TO-PMOD-7
Texas Instruments
TPS92550TZ
1
CIN
2.2 µF, 100V, X7R
1210
Murata
GRM32ER72A225KA35L
1
COUT
2.2 µF, 100V, X7R
1210
Murata
GRM32ER72A225KA35L
1
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TPS92550
PCB Layout Diagrams
The PCB design is available in the TPS92550 product folder at www.ti.com.
30181050
FIGURE 8. Top Layer and Top Overlay
30181040
FIGURE 9. Bottom Layer and Bottom Overlay
17
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30181051
FIGURE 10. Top Overlay
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TPS92550
Physical Dimensions inches (millimeters) unless otherwise noted
TO-PMOD-7 Pin Package
NS Package Number TZA07A
19
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TPS92550 450mA 14W Constant Current Buck LED Driver Micro-Module
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IMPORTANT NOTICE
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