AP3154FG7 [DIODES]
LED Driver, 4-Segment, GREEN, DFN12;
| 型号： | AP3154FG7 |
| 厂家： | 
DIODES INCORPORATED |
| 描述： | LED Driver, 4-Segment, GREEN, DFN12 驱动 接口集成电路 |
| 文件： | 总13页 (文件大小：605K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
General Description
Features
The AP3154 is a high efficiency charge-pump white LED driver
with 1x, 1.5x, 2x operating modes. The AP3154 operates on
power supplies from 2.7v to 5.5v. It drives up to four channels of
white LEDs while the intensity of each channel is configured by
varying the respective current levels. Each channel can supply up
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Up to 88% Max power efficiency
Wide input voltage range: 2.7V ~ 5.5V
1x, 1.5x, and 2x charge-pump modes
Drive up to 4 white LEDs
Default maximum current setting: 30mA each channel
120mA maximum output current through 4 channels
Programmable switching frequency, default 1.2MHz
Spread Spectrum Control with 10% frequency deviation
1-wire Serial Digital Interface (SDI) or PWM for dimming
control
to 30mA current. Up to four channels can be ganged together to
provide maximum load current of 120mA.
The Serial Digital Interface (SDI) provides the capability to
configure the current for each LED channel. Some other key
features, such as Up Spread Spectrum Control, different
charge-pump switching frequencies (0.6MHz/1.2MHz/1.8MHz),
and PWM dimming control, can also be programmed through the
interface.
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Soft-start during power-up and mode switching
Soft-stop during shutdown
Short-circuit protection
Over-voltage protection and under-voltage lockout
The AP3154 has a built-in soft-start circuit to minimize the inrush
current during power-up and mode switching. Various protections
such as short-circuit, over-voltage, under-voltage, and thermal
shutdown are integrated to ensure system reliability. The
quiescent current of AP3154 during shutdown is less than 6µA.
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Low shutdown current < 6µA
Industry-leading low profile package
DFN3030-12: Available in “Green” Molding Compound
(No Br, Sb)
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Lead Free Finish / RoHS Compliant (Note 1)
Applications
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Mobile Phone
PDA (Personal Digital Assistant)
White LED Backlighting
Camera Flash LED Lighting
LCD Modules
Portable Devices
Ordering Information
AP 3154 F G - 7
Package
F : DFN3030-12
Green
Packing
G : Green
7 : Tape & Reel
7” Tape and Reel
Packaging
(Note 2)
DFN3030-12
Device
Package Code
Quantity
3000/Tape & Reel
Part Number Suffix
AP3154FG-7
F
-7
Notes:
1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html.
2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Pin Assignment
( Top View )
1
2
3
4
5
6
12
D4
SDI
C1P
D3
11
D2
10
D1
Exposed
Pad
9
C1N
GND
8
VOUT
VIN
7
C2P
C2N
DFN3030-12
Pin Descriptions
Pin Name
D4
Pin #
Description
1
2
Current Sink Input #4. Connect to VOUT when un-used.
1-wire Serial Digital Interface Input / PWM input
SDI
Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C1P and
C1N.
C1P
C1N
3
4
Negative Terminal of Flying Capacitor.
The charge pump output voltage to drive load circuit. Connect a 1µF capacitor
between this pin and ground.
VOUT
5
Positive Terminal of Flying Capacitor. Connect a 1µF capacitor between C2P and
C2N.
C2P
6
C2N
VIN
7
8
Negative Terminal of Flying Capacitor.
Input Power Source. Connect a 1µF capacitor between this pin and ground.
Ground.
GND
D1
9
10
11
12
Current Sink Input #1. Connect to VOUT when un-used.
Current Sink Input #2. Connect to VOUT when un-used.
Current Sink Input #3. Connect to VOUT when un-used.
D2
D3
GND
EP PAD
Exposed Pad (bottom). Connect to ground underneath the package.
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Block Diagram
C2P
C2N
C1P C1N
VOUT
VIN
SHORT
CIRCUIT
PROTECTION
OVER
VOLTAGE
PROTECTION
CHARGE PUMP
SWITCHES
SERIAL
DIGITAL
INTERFACE
OUTPUT VOLTAGE REGULATION
SDI
DIGITAL
CONTROL
BLOCK
&
LED SHORT CIRCUIT DETECTION
D1
D2
D3
BANDGAP
OSCILLATOR
OVER
CURRENT
CONTROL
D4
TEMPERATURE
PROTECTION
UNDER
VOLTAGE
LOCKOUT
GND
Typical Application Circuit
8
6
VIN
VIN
C2P
1uF
C2
1uF
CIN
7
3
C2N
C1P
1uF
C1
4
5
C1N
AP3154
VOUT
1uF
D2
D1
D4
D3
LED
LED
COUT
LED
LED
2
1
SDI
D4
D3
D2
D1
SDI
12
11
10
GND
9
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Absolute Maximum Ratings (Notes 3)
Symbol
Description
Value
Units
2
200
ESD HBM Human Body Model ESD Protection
KV
V
ESD MM
VIN
Machine Model ESD Protection
Input Voltage
-0.3 to 6
-0.3 to VIN + 0.3
150
V
VSDI
SDI to GND Voltage
V
IOUT
Maximum DC Output Current
Maximum Power Dissipation
Operating Junction Temperature Range
mA
W
°C
PD
0.85
TJ
-40 to 150
Notes:
3. Exceeding Absolute Maximum Ratings will cause permanent damage to the device.
Recommended Operating Conditions
Symbol
Parameter
Min
Max
Units
Input Voltage
Operating Ambient Temperature
2.7
-40
5.5
85
V
VIN
TA
°C
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Electrical Characteristics
CIN = COUT = C1 = C2 = 1.0µF; TA = 25°C, VIN = 3.5V. Unless otherwise stated.
Symbol
Description
Conditions
1X Mode
Fosc=1.2MHz,
SDI=HIGH, no load
SDI = 0
Min
Typ.
1.2
Max
Units
IQ
Quiescent Current
mA
ISHDN
IDX
Shutdown Current
ISINK Current Accuracy
(Note 4)
0.3
6
µA
%
I
SINK = 20mA
-10
10
Current Matching
(Note 5)
VF: D1=D2=D3=D4
ID = 2, 20mA
ID-Match
5
%
TSS
FCLK
Soft-start Time
Switching Clock Frequency
Spread Spectrum
SDI Threshold Low
SDI Threshold High
1
ms
MHz
%
V
V
0.6/1.2/1.8
+10
FSSP
VSDI(L)
VSDI(H)
TSLO
TSHI
Enabled
VIN = 2.7V to 5.5V
VIN = 2.7V to 5.5V
0.4
1.6
0.05
0.05
SDI Low Time
SDI High Time
50
50
µs
µs
PWM Frequency (Range 1)
PWM Frequency (Range 2)
PWM Signal Period
PWM Signal Low (LED off)
PWM Signal High (LED on)
0.2
20
1/ fPWM-Max
1.5
30
1/ fPWM-Min
TPWM – 1
TPWM – 1
100
KHz
KHz
µs
µs
µs
ms
µs
ms
µs
fPWM
TPWM
TPLO
TPHI
1
1
PWM
No PWM
PWM
65
512
65
TOFF
TSEP
Chip Disable (held low)
800
100
800
Interval between SDI
sequences (held high)
No PWM
512
ISDI
SDI Input Leakage
-1
1
µA
VOUT Short to GND hold
Current
Thermal Resistance1 –
Junction to Ambient
Maximum Thermal
Resistance1 –
ISCP
500
160
mA
DFN3030-12
(Note 6)
θJA
θJC
°C/W
DFN3030-12
(Note 6)
21
°C/W
Junction to Case
Notes:
4. Determined by the average current levels of all active channels.
5. Defined as the deviation of any sink current from the average of all active current channels.
6. Device mounted on FR-4 substrate PC board, 2oz copper, with minimum recommended pad layout.
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Typical Performance Characteristics
Efficiency vs. Supply Voltage
Turn-On to 1X Mode
(VIN = 4.2V; 20mA Load)
Turn-On from 1.5X Mode
(VIN = 3.5V; 20mA Load)
Turn-On to 2X Mode
(VIN = 2.7V; 20mA Load)
Turn-Off from 1.5X Mode
(VIN = 3.5V; 20mA Load)
Current Matching vs. Temperature
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Typical Performance Characteristics (Continued)
Load Characteristics
Load Characteristics
(VIN = 3.5V; 1.5X Mode; 14mA Load)
(VIN = 2.7V; 2X Mode; 14mA Load)
Load Characteristics
Load Characteristics
(VIN = 3.5V; 1.5X Mode; 20mA Load)
(VIN = 2.7V; 2X Mode; 20mA Load)
Load Characteristics
Load Characteristics
(VIN = 3.5V; 1.5X Mode; 30mA Load)
(VIN = 3.1V; 2X Mode; 30mA Load)
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Typical Performance Characteristics (Continued)
Enable Threshold High vs. Input Voltage
Enable Threshold Low vs. Input Voltage
PWM Dimming Operation
PWM Dimming Operation
(VIN = 3.5V; 20mA Load; Duty=1:1; f=1KHz)
(VIN = 3.5V; 20mA Load; Duty=11:1; f=1KHz)
PWM Dimming Operation
(VIN = 3.5V; 20mA Load; Duty=1:11; f=1KHz)
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Functional Description
General Functional Description
5
6
All 4 Channels in dimming control
CH2, CH3 and CH4 in dimming control
CH1 and CH2 in dimming control
CH3 and CH4 in dimming control
CH1 in dimming control
The AP3154 is designed for white LED applications. An internal
comparator circuit compares the voltage at each constant current
sink input against a reference voltage. To ensure maximum
power efficiency, the most appropriate switching mode (x1, x1.5,
x2) is automatically selected.
7
8
9
In applications, only four external components are required: two
1µF ceramic flying capacitors (C1 and C2), one 1µF ceramic
capacitor each for input and output (CIN, COUT).
10
11
12
13
14
15
16
17
18
19
20
21~62
63
CH2 in dimming control
CH3 in dimming control
AP3154 drives up to four white LEDs with a maximum current of
30mA each. A total of 120mA is provided to the four channels.
Through SDI, the current into each channel can be configured in
accordance to specific protocol and pre-defined values.
CH4 in dimming control
Low-Current Mode (Maximum Current set to 2mA)
Maximum Current set to 14mA (All channels)
Maximum Current set to 20mA (All channels)
Maximum Current set to 30mA (All channels)
10% Up Spread Spectrum Control Enable/Disable
Switching Frequency set to 0.6Mhz
Switching Frequency set to 1.2Mhz
Switching Frequency set to 1.8Mhz
Reserved
Maximum output current can be set to one of the four possible
scales: 2mA, 14mA, 20mA, 30mA. Among these, the ‘2mA’
setting is called “low current mode”. This would be useful for
applications which require very low operating current, e.g.
transmissive LCD panels.
For each maximum output current scale, there are 16 current
level settings separated from one another by approximately
1dB. While level-16 corresponds to maximum current output,
level-1 corresponds to zero output current. As the current level
varies logarithmically, intensity of the LED changes in a linear
fashion.
PWM Dimming Control Enable/Disable
Dimming Control Current Level Setting
The current level at the individual channels is configured via SDI
which supports data rate up to 10MHz. It allows the main
controller in the system to be offloaded to perform more
mission-critical functions.
AP3154 supports four maximum output current scales including
30mA, 20mA, 14mA, and 2mA low-current scales. For each
maximum current scale, there are 16 current level settings
separated from one another by appromimately 1dB (see table 2).
By default, maximum current scale is set to 20mA and dimming
control current level is set to maximum (level 16).
Serial Digital Interface
SDI is a general purpose 1-wire digital interface designed to
transport digital controls for power management ICs such as
AP3154. The current levels of the four channels can be
configured either together or individually. Up to 16 current
levels are allowed. A generic system controller can easily
support the SDI protocol via bit-banging over its general
purpose I/Os.
Through SDI, certain channels or all four channels can be
selected, and dimming control level for these channels can be set
to maximum (level 16), minimum (level1), up from minimum to
maximum or down from maximum to minimum (see table 1).
Dimming
The SDI protocol is simple yet flexible enough to
accommodate different switching clock frequencies. Any
sequence of negative-edged pulses of 63 or less (see table 1),
separated by TSEP at the SDI pin is interpreted by AP3154 as
a channel configuration event. In the future, the number of
pulses can be extended to support additional commands.
Control
Current
Low-Current
(2mA)
Iout
(20mA)
Iout
(30mA)
Iout
(14mA)
Levels
16
15
14
13
12
11
10
9
8
7
6
5
20.0
17.8
15.9
14.3
12.7
11.1
10.2
8.9
7.9
7.0
6.3
5.7
30.0
26.7
23.8
21.4
19.0
16.7
15.2
13.3
11.9
10.5
9.5
14.0
12.5
11.1
10.0
8.9
7.8
7.1
6.2
5.6
4.9
4.4
4.0
3.5
3.1
2.9
0.05
2.0
1.78
1.59
1.43
1.27
1.11
1.02
0.89
0.79
0.70
0.63
0.57
0.51
0.44
0.41
0.05
In addition to the SDI protocol, dimming control can also be
achieved by presenting a timing-specific PWM signaling at the
SDI pin.
Number
of Falling
Edges
Command Description
8.6
7.6
6.7
6.2
1
2
3
4
Current level step up (1 up to level 16)
4
3
2
1
5.1
4.4
4.1
0.05
Current level step down (16 down to level 1)
Current level set to 16 (maximum current level)
Current level set to 1 (minimum current level)
0.05
Table 2: Dimming Control Current Level
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Functional Description (Continued)
Disabled Current Sinks
Thermal Shutdown
Unused current channels must be disabled by connecting the
sinks to VOUT with only a small sense current flowing through the
disabled channel.
When the die temperature exceeds the thermal limit, the device
will be disabled and enter stand-by mode. The operation will be
resumed whenever the die cools off sufficiently.
Switching Frequency
Soft-Start and Soft-Stop
By default, AP3154 is working at 1.2Mhz switching frequency. It
can also work at 0.6MHz or 1.8MHz switching frequency set
through SDI. User can choose the appropriate switching
frequency with consideration of noise immunity, input/output
voltage ripple requirement, and capacitor selection etc.
Soft-start and Soft-stop function are incorporated to prevent
excessive inrush current during power-up, mode switching,
power-down, transition out of stand-by mode.
Short-Circuit Protection
Short-circuit protection function is incorporated to prevent
excessive load current when either flying cap terminals or output
pin electrically tied to a very low voltage or ground.
Up Spread Spectrum Control
When this feature is enabled through SDI, the switching
frequency periodically varies between 100% and 110% of
nominal frequency. It flattens the peak energy on nominal
frequency over a range of frequency band so that EMI effect is
significantly reduced.
Over-Voltage Protection
Over-voltage protection function is incorporated to limit the
output voltage under a safe value to avoid on-chip device
breakdown.
PWM Dimming Control
The AP3154 provides flexible dimming control with either
16-level SDI protocol control or PWM dimming control through
SDI pin. When PWM dimming control is enabled, the sink
current is adjusted by the duty cycle of the signal applied on SDI
pin.
Under-Voltage Lockout
Under-voltage lockout feature disables the device when the
input voltage drops below UVLO threshold.
Serial Digital Interface
SDI Command Timing
For an SDI command to be successfully received by the AP3154, all SDI timing specifications should be satisfied. When no command is
being sent the SDI pin should be held high. If the SDI pin goes low and stays low for a time length of between TSLO(min) and TSLO(max)
and then goes high and stays high for between TSHI(min) and TSHI(max), one falling edge is registered by the AP3154. The total
number of falling edges registered before the SDI pin is held high for longer than the maximum separation time TSEP(max) identifies the
command that has been received by the AP3154. The next series of falling edges before another separation time TSEP represents the
next command. In other words, the AP3154 counts the number of consecutive falling edges on the SDI pin and a different number
represents a different command.
Each command is executed after it is successfully received. If at any time the SDI pin is held low for longer than the maximum chip
disable time TOFF(max), the AP3154 is disabled and enters the shutdown mode. All internal registers are reset to default. Setting the
SDI pin high again will re-enable the AP3154 and bring it out of the shutdown mode.
The AP3154 enters the SDI mode by default when it is first powered up. The first SDI command 63 (63 falling edges) will put the AP3154
into the PWM mode, where a high level on the SDI pin turns the LEDs on, a low level turns the LEDs off and the duty cycle determines
the average LED brightness. The next SDI command 63 will put the AP3154 back into the SDI mode. It should be pointed out that the
PWM mode is for dimming control only and configuration settings have to be done in the SDI mode.
Channel Configuration Example
The following timing diagram is a dimming control example. In this example, the first command (command 10) selects Channel 2 as the
configuration target and the second command (command 2) sets the Channel 2 current level to one step lower while the other channels
remain unchanged.
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Serial Digital Interface (Continued)
Marking Information
(1) DFN3030-12
( Top View )
XX : Identification code
Y : Year 0~9
XX
W : Week : A~Z : 1~26 week;
a~z : 27~52 week; z represents
Y W X
52 and 53 week
X : A~Z : Green
Part Number
AP3154F
Package
Identification Code
DFN3030-12
F8
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Package Information (All Dimensions in mm)
(1) Package type: DFN3030-12
0.10 C
0.08 C
Seating plane
C
2.9 / 3.1
2.3 / 2.5
A
B
0.25 B
2x-
0.45typ
0.18/0.28
Bottom View
0.10
M C A B
AP3154 Rev. 2
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AP3154
120mA HIGH EFFICIENCY WHITE LED DRIVER
Taping Orientation
Notes:
7. The taping orientation of the other package type can be found on our website at http://www.diodes.com/datasheets/ap02007.pdf
IMPORTANT NOTICE
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes without further
notice to any product herein. Diodes Incorporated does not assume any liability arising out of the application or use of any product described herein; neither
does it convey any license under its patent rights, nor the rights of others. The user of products in such applications shall assume all risks of such use and will
agreeto hold Diodes Incorporatedand all the companieswhose products are represented onour website, harmlessagainst all damages.
LIFE SUPPORT
Diodes Incorporated productsare not authorizedfor use as criticalcomponents in lifesupport devices or systemswithout theexpressed written approval of the
President of DiodesIncorporated.
AP3154 Rev. 2
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