W-6139 [NIDEC]
22 V High Current Boost;
| 型号： | W-6139 |
| 厂家： | 
NIDEC COMPONENTS |
| 描述： | 22 V High Current Boost |
| 文件： | 总13页 (文件大小：304K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
W-6139
22 V High Current Boost
White LED Driver
Description
The W-6139 is a DC/DC VWHSïXS converter that delivers an
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TSOTï23
PIN CONNECTIONS
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1
VIN
SW
GND
FB
SHDN
Features
(Top View)
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TPYM
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Y = Production Year (Last Digit)
M = Production Month (1ï9, A, B, C or O, N, D)
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ORDERING INFORMATION
v These Devices are PbïFreeꢄꢀ+alRJen Free/BFR Free and are RoHS
Compliant
Device
Package
Shipping
W-6139TDïGT3
TSOTï23
(PbïFree)
3,000/
Applications
(Note 1)
Tape & Reel
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v Handheld Devices
1. NiPdAu Plated Finish (RoHSïcompliant)
¢ NIDEC COPAL ELECTRONICS CORP.
October, 2015 ï Rev. 2
1
Publication Order Number:
W-6139/E
W-6139
9 strings at
20 mA
L
D
V
IN
V
OUT
22
H
5 V
C2
C1
4.7
F
1 F
35 V
SW
VIN
W-6139
SHDN
GND
I
OUT
R2
1 k
180 mA
OFF
FB
ON
(300 mV)
R1
1.62
L: Sumida CDRH6D28ï220
D: Central CMSH1ï40 (rated 40 V)
Figure 1. Typical Application Circuit
Table 1. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
ï0.3 to +7
ï0.3 to +7
ï0.3 to +40
ï65 to +160
ï40 to +150
300
Units
VIN, FB Voltage
SHDN Voltage
SW Voltage
V
V
V
C
C
C
Storage Temperature Range
Junction Temperature Range
Lead Temperature
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
Table 2. RECOMMENDED OPERATING CONDITIONS (Typical application circuit with external components is shown above.)
Parameters
Range
Units
VIN
up to 5.5
V
V
C
SW pin voltage
0 to 22
ï40 to +85
Ambient Temperature Range (Note 2)
2. TSOT23ï5 package thermal resistance
= 135$C/W when mounted on board over a ground plane.
JA
2
W-6139
Table 3. DC ELECTRICAL CHARACTERISTICS
(V = 3.6 V, ambient temperature of 25$C (over recommended operating conditions unless otherwise specified))
IN
Symbol
Parameter
Operating Current
Test Conditions
= 0.2 V
Min
Typ
Max
Units
I
Q
V
FB
V
FB
0.6
0.1
1.5
0.6
mA
= 0.4 V (not switching)
I
Shutdown Current
FB Pin Voltage
V
= 0 V
0.1
1
315
1
A
mV
A
SD
SHDN
V
9 x 3 LEDs, I
= 180 mA
285
300
FB
FB
OUT
I
FB pin input leakage
Programmed LED Current
I
R1 = 10
R1 = 3
28.5
30
31.5
mA
LED
100
V
SHDN Logic High
SHDN Logic Low
Enable Threshold Level
0.8
0.7
1.5
1.3
V
IH
V
Shutdown Threshold Level
0.4
0.8
IL
F
Switching Frequency
Switch Current Limit
1.0
MHz
mA
SW
LIM
I
V
IN
V
IN
= 3.6 V
= 5 V
600
750
R
Switch “On” Resistance
I
= 100 mA
1.0
1
2.0
5
SW
SW
I
Switch Leakage Current
Thermal Shutdown
Switch Off, V
= 5 V
SW
A
$C
$C
V
LEAK
T
150
20
1.9
24
29
SD
T
Thermal Hysteresis
HYST
UVLO
V
Underïvoltage lock out (UVLO) Threshold
Overïvoltage detection threshold
Output Clamp voltage
V
23
V
OVïDET
V
OCL
“Open LED”
V
DC
Maximum duty cycle
Minimum duty cycle
92
16
%
3
W-6139
TYPICAL CHARACTERISTICS
(V = 5.0 V, I
= 180 mA, T = 25$C, with typical application circuit unless otherwise specified.)
AMB
IN
OUT
200
150
2.0
V
FB
= 0.4 V
1.5
1.0
100
50
0.5
0
3.0
3.5
4.0
4.5
5.0
5.5
150
5.5
3.0
3.5
4.0
4.5
5.0
5.5
200
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 2. Quiescent Current vs. VIN
(Not Switching)
Figure 3. Quiescent Current vs. VIN
(Switching)
303
302
301
310
305
300
300
299
295
290
298
297
ï50
0
50
100
80
100
120
140
160
180
TEMPERATURE ($C)
OUTPUT CURRENT (mA)
Figure 4. FB Pin Voltage vs. Temperature
Figure 5. FB Pin Voltage vs. Output Current
1.2
2.0
1.5
1.0
1.1
1.0
0.9
0.8
0.5
0
3.0
3.5
4.0
4.5
5.0
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 6. Switching Frequency vs. Supply
Voltage
Figure 7. Switch ON Resistance vs.
Input Voltage
4
W-6139
TYPICAL CHARACTERISTICS
(V = 5.0 V, I
= 180 mA, T = 25$C, with typical application circuit unless otherwise specified.)
AMB
IN
OUT
200
180
160
140
2.0
1.5
1.0
0.5
0
ï0.5
ï1.0
120
100
ï1.5
ï2.0
3.0
3.5
4.0
4.5
5.0
5.5
4.5
4.7
4.9
5.1
5.3
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 8. Output Current vs. Input Voltage
Figure 9. Output Current Regulation
95
90
85
95
90
85
IOUT = 120 mA
IOUT = 180 mA
80
75
80
75
80
100
120
140
160
180
200
4.5
4.7
4.9
5.1
5.3
5.5
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
Figure 10. Efficiency vs. Output Current
Figure 11. Efficiency vs. Input Voltage
Figure 12. Powerïup at 180 mA
Figure 13. Switching Waveform
5
W-6139
TYPICAL CHARACTERISTICS
(V = 5.0 V, I
= 180 mA, T = 25$C, with typical application circuit unless otherwise specified.)
AMB
IN
OUT
300
250
200
150
100
1.0
ï40$C
VOUT = 9 V
0.8
ï25$C
85$C
125$C
0.6
VOUT = 14 V
0.4
0.2
50
0
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 14. Maximum Output Current
Figure 15. Shutdown Voltage
900
850
800
VOUT = 9 V
VOUT = 12 V
750
700
650
600
4.5
4.7
4.9
5.1
5.3
5.5
INPUT VOLTAGE (V)
Figure 16. Switch Current Limit
6
W-6139
Pin Description
VIN is the supply input for the internal logic. The device is
compatible with supply voltages down to 2.8 V and up to
5.5 V. It is recommended that a small bypass ceramic
capacitor (4.7 F) be placed between the VIN and GND pins
near the device. If the supply voltage drops below 1.9 V, the
device stops switching.
SW pin is connected to the drain of the internal CMOS
power switch of the boost converter. The inductor and the
Schottky diode anode should be connected to the SW pin.
Traces going to the SW pin should be as short as possible
with minimum loop area. An overïvoltage detection circuit
is connected to the SW pin. When the voltage reaches 24 V,
the device enters a low power operating mode preventing the
SW voltage from exceeding the maximum rating.
SHDN is the shutdown logic input. When the pin is tied to
a voltage lower than 0.4 V, the device is in shutdown mode,
drawing nearly zero current. When the pin is connected to a
voltage higher than 1.5 V, the device is enabled.
GND is the ground reference pin. This pin should be
connected directly to the ground plane on the PCB.
FB feedback pin is regulated at 0.3 V. A resistor connected
between the FB pin and ground sets the LED current
according to the formula:
0.3 V
ILED
R1
The lower LED cathode is connected to the FB pin.
Table 4. PIN DESCRIPTIONS
Pin #
Name
Function
1
2
3
4
5
SW
Switch pin. This is the drain of the internal power switch.
GND
FB
Ground pin. Connect the pin to the ground plane.
Feedback pin. Connect to the last LED cathode.
Shutdown pin (Logic Low). Set high to enable the driver.
Power Supply input.
SHDN
VIN
V
OUT
V
IN
SW
C2
C1
1 MHz
Over Voltage
Ref
Oscillator
Protection
300 mV
–
Driver
PWM
&
I
+
–
LED
+
Logic
Thermal
Shutdown
& UVLO
V
IN
+
–
R
S
GND
FB
SHDN
Current
Sense
Figure 17. Simplified Block Diagram
7
W-6139
Device Operation
The W-6139 is a fixed frequency (1 MHz), low noise,
inductive boost converter that provides a constant current
with excellent line and load regulation. The device uses a
highïvoltage CMOS power switch between the SW pin and
ground to energize the inductor. When the switch is turned
off, the stored energy in the inductor is released into the load
via the Schottky diode.
currents and thereby provide a “softïstart” mode of
operation.
In the event of an “Open LED” fault condition, where the
feedback control loop becomes open, the output voltage will
continue to increase. Once this voltage exceeds 24 V, an
internal protection circuit will become active and place the
device into a very low power safe operating mode.
Thermal overload protection circuitry has been included
to prevent the device from operating at unsafe junction
temperatures above 150$C. In the event of a thermal
overload condition the device will automatically shutdown
and wait till the junction temperatures cools to 130$C before
normal operation is resumed.
The on/off duty cycle of the power switch is internally
adjusted and controlled to maintain a constant regulated
voltage of 0.3 V across the feedback resistor connected to the
feedback pin (FB). The value of the resistor sets the LED
current accordingly (0.3 V/R1).
During the initial powerïup stage, the duty cycle of the
internal power switch is limited to prevent excessive inïrush
Application Information
External Component Selection
Capacitors
forward voltage should be as low as possible. The response
time is also critical since the driver is operating at 1 MHz.
Central Semiconductor Schottky rectifier CMSH1ï40 (1 A
rated) is recommended for most applications.
The W-6139 only requires small ceramic capacitors of
4.7 F on the input and 1 F on the output. Under normal
condition, a 4.7 F input capacitor is sufficient. For
applications with higher output power, a larger input
capacitor of 10 F may be appropriate. X5R and X7R
capacitor types are ideal due to their stability across
temperature range.
LED Current Setting
The LED current is set by the external resistor R1
connected between the feedback pin (FB) and ground. The
formula below gives the relationship between the resistor
and the current:
Inductor
A 22 H inductor is recommended for most of the
W-6139 applications. In cases where the efficiency is
critical, inductances with lower series resistance are
preferred. Inductors with current rating of 800 mA or higher
are recommended for most applications. Sumida
CDRH6D28ï220 22 H inductor has a rated current of
1.2 A and a series resistance (D.C.R.) of 128 m typical.
0.3 V
R1
LED current
Table 5. RESISTOR R1 AND LED CURRENT
LED Current (mA)
R1 ( )
20
25
15
12
10
3
Schottky Diode
The current rating of the Schottky diode must exceed the
peak current flowing through it. The Schottky diode
performance is rated in terms of its forward voltage at a
given current. In order to achieve the best efficiency, this
30
100
300
1
8
W-6139
Schottky 40 V
Open LED Protection
(Central CMSH05ï4)
In the event of an “Open LED” fault condition, the
W-6139 will continue to boost the output voltage with
maximum power until the output voltage reaches
approximately 24 V. Once the output exceeds this level, the
internal circuitry immediately places the device into a very
low power mode where the total input power is limited to
about 6 mW (about 1.6 mA input current with a 3.6 V
supply). The SW pin clamps at a voltage below its maximum
rating of 40 V. There is no need to use an external zener diode
between VOUT and the FB pin. A 35 V rated C2 capacitor
is required to prevent any overvoltage damage in the open
LED condition.
L
D
V
OUT
V
IN
22
H
C1
4.7
C2
1
F
F
SW
FB
VIN
W-6139
OFF
SHDN
GND
ON
R1
15
Figure 18. Open LED Protection Circuit
Figure 19. Open LED Disconnect and Reconnect
Figure 20. Open LED Disconnect
2.5
35
30
25
2.0
1.5
1.0
20
15
3.0
3.5
4.0
4.5
5.0
5.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Figure 21. Open LED Supply Current
Figure 22. Open LED Output Voltage
9
W-6139
Dimming Control
Filtered PWM Signal
There are several methods available to control the LED
brightness.
A filtered PWM signal used as a variable DC voltage can
control the LED current. Figure 24 shows the PWM control
circuitry connected to the W-6139 FB pin. The PWM
signal has a voltage swing of 0 V to 2.5 V. The LED current
can be dimmed within a range from 0 mA to 20 mA. The
PWM signal frequency can vary from very low frequency
and up to 100 kHz.
PWM Signal on the SHDN Pin
LED brightness dimming can be done by applying a PWM
signal to the SHDN input. The LED current is repetitively
turned on and off, so that the average current is proportional
to the duty cycle. A 100% duty cycle, with SHDN always
high, corresponds to the LEDs at nominal current. Figure 23
shows a 1 kHz signal with a 50% duty cycle applied to the
SHDN pin. The recommended PWM frequency range is from
100 Hz to 2 kHz.
VIN
SW
W-6139
LED
Current
SHDN
GND
FB
V
PWM
Signal
R
A
= 300 mV
R2
FB
R
2.5 V
0 V
3.73 k
B
V
IN
3.1 k
R1
15
C3
1 k
0.22
F
Figure 24. Circuit for Filtered PWM Signal
A PWM signal at 0 V DC, or a 0% duty cycle, results in
a max LED current of about 22 mA. A PWM signal with a
93% duty cycle or more, results in an LED current of 0 mA.
25
20
15
Figure 23. Switching Waveform with 1 kHz
PWM on SHDN
10
5
0
0
10 20 30 40 50 60 70 80 90 100
PWM DUTY CYCLE (%)
Figure 25. Filtered PWM Dimming (0 V to 2.5 V)
10
W-6139
Board Layout
The W-6139 is a high-frequency switching regulator.
The traces that carry the high-frequency switching current
have to be carefully laid out on the board in order to
minimize EMI, ripple and noise in general. The thicker lines
on Figure 26 show the switching current path. All these
traces have to be short and wide enough to minimize the
parasitic inductance and resistance. The loop shown on
Figure 26 corresponds to the current path when the
W-6139 internal switch is closed. On Figure 27 is shown
the current loop, when the W-6139 switch is open. Both
loop areas should be as small as possible.
Capacitor C1 has to be placed as close as possible to the
VIN pin and GND. The capacitor C2 has to be connected
separately to the top LED anode. A ground plane under the
W-6139 allows for direct connection of the capacitors to
ground. The resistor R1 must be connected directly to the
GND pin of the W-6139 and not shared with the switching
current loops and any other components.
L
D
V
L
D
OUT
V
OUT
V
IN
V
IN
SW
SW
VIN
VIN
Switch
Closed
Switch
Open
W-6139
W-6139
SHDN
SHDN
FB
FB
C
C
C
1
R1
R1
1
2
C
2
GND
GND
Figure 26. Closedïswitch Current Loop
Figure 27. Openïswitch Current Loop
Figure 28. Recommended PCB Layout
11
W-6139
PACKAGE DIMENSIONS
TSOTï23, 5 LEAD
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
0.95 TYP
0.40
E1
E
E
E1
e
L
0.30
0.50
L1
L2
Q
0.60 REF
0.25 BSC
0º
8º
TOP VIEW
A2 A
A1
L
b
c
L2
L1
SIDE VIEW
END VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC MO-193.
12
W-6139
Example of Ordering Information (Note 5)
Prefix
Device #
Suffix
W
-
6139
TD
ï G
T3
Company ID
(Optional)
Product Number
Package
TD: TSOTï23
Lead Finish
G: NiPdAu
Tape & Reel
T: Tape & Reel
3: 3,000 / Reel
6139
SERIES LED DRIVERS
Part Number
Description
W-6137
W-6237
W-6238
W-6139
CMOS Boost Converter ï White LED Driver
High Voltage CMOS Boost White LED Driver
High Efficiency 10 LED Boost Converter
22 V High Current Boost White LED Driver 6
3. All packages are RoHSïcompliant (Leadïfree, Halogenïfree).
4. The standard lead finish is NiPdAu.
5. The device used in the above example is a W-6139T'ïGT3 (TSO7ï23, NiPdAu, Tape & Reel, 3,000/Reel).
NIDEC COPAL reserves the right to make changes without further notice to any products herein.
NIDEC COPAL makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does NIDEC COPAL assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in NIDEC COPAL data sheets and/or specifications can and do vary in different applications and actual performance may vary over time.
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NIDEC COPAL does not convey any license under its patent rights nor the rights of others.
NIDEC COPAL products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to
support or sustain life, or for any other application in which the failure of the NIDEC COPAL product could create a situation where personal injury or death may occur.
Should Buyer purchase or use NIDEC COPAL products for any such unintended or unauthorized application, Buyer shall indemnify and hold NIDEC COPAL and its officers,
employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly,
any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that NIDEC COPAL was negligent regarding the design or
manufacture of the part.
W-6139/D
13
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