LV52207AXA-VH [ONSEMI]
Dual channel LED Boost Driver;
| 型号： | LV52207AXA-VH |
| 厂家： | 
ONSEMI |
| 描述： | Dual channel LED Boost Driver |
| 文件： | 总18页 (文件大小：2147K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LV52207AXA
Bi-CMOS LSI
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Dual channel LED Boost Driver
with PWM and 1-Wire Dimming
Overview
The LV52207AXA is a high voltage boost driver for LED drive with 2
channels adjustable constant current sources.
Feature
Operating Voltage from 2.7V to 5.5V
Integrated 40V MOSFET
1-Wire 255 level digital and PWM dimming
Supports CABC
600kHz Switching Frequency
37.5V OVP Threshold
WLP9, 1.31x1.31, 0.4mm pitch
(1.31mm x 1.31mm, Amax=0.625 mm)
Typical Applications
LED Display Backlight Control
Fig1. 5x2 LED Application
ORDERING INFORMATION
See detailed ordering and shipping information on page 18 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
November 2014 - Rev. 1
1
Publication Order Number :
LV52207AXA/D
LV52207AXA
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
V
Maximum supply voltage
Maximum Pin voltage1
Maximum Pin voltage2
Allowable power
V
max
V
CC
6
40
CC
V1 max
V2 max
Pd max
Topr
SW
V
Other pin
Ta=25C *1
5.5
V
0.95
W
C
C
Operating temperature
Storage temperature
40 to +85
55 to +125
Tstg
*1 Mounted on a specified board: 70mm×70mm×1.6mm (4 layer glass epoxy)
Caution 1) Absolute maximum ratings represent the values which cannot be exceeded for any length of time.
Caution 2) Even when the device is used within the range of absolute maximum ratings, as a result of continuous usage under high
temperature, high current, high voltage, or drastic temperature change, the reliability of the IC may be degraded. Please
contact us for the further details.
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
Recommended Operating Conditions at Ta = 25C
Parameter
Symbol
Conditions
VCC
Ratings
Unit
V
Supply voltage range1
PWM frequency
V
CC
op
2.7 to 5.5
Fpwm
PWM pin input signal
PWM pin input signal
300 to 100k
0.9%
Hz
MIN DUTY (PWM pin)
Dminpwm
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
Electrical Characteristics Analog block
at Ta=25°C, VCC=3.6V, RT resistor=63.4K unless otherwise specified
Ratings
Parameter
Symbol
Conditions
Unit
min
typ
max
Standby current
dissipation
Icc1
EN=PWM=L
0
2
A
DC/DC current
dissipation1
FB Voltage
Device enable, switching 0.6 MHz
and no load
LEDO1, 2=20mA
Icc2
Vfb
0.7
0.2
1.2
mA
V
LEDO1 LEDO2
Output Current1
Io1
LEDISET=20mA
Duty=100%
LEDO1 LEDO2 LEDISET=20mA
Duty=100%
(IMAX – IAVG) / IAVG
LEDO1 LEDO2
LEDO1 LEDO2
SW_pin over voltage threshold
LEDO_pin over voltage threshold
LEDO DC rising
19.6
40
20
20.4
2
mA
%
Output Current
Matching1
Iom1
0.3
LEDO1, 2 max current
LEDO1, 2 leak current
OVP Voltage
Imax
Ilk
Vovp
mA
A
V
1
39
36
37.5
4.5
LEDO_OVP Voltage
VLovp
Ron
4.2
5.0
V
m
A
SWOUT ON resistance
NMOS Switch Current
Limit
IL=100mA
300
1.5
ILIM
1
OSC Frequency
Fosc
VINH
VINL
Vuvlo
500
1.2
0
600
750
kHz
V
V
CC
High level input voltage
Low level input voltage
Under Voltage Lockout
EN pin output voltage
for Acknowledge
EN PWM
EN PWM
VIN falling
0.4
V
V
2.2
Vack
0.4
V
Rpullup=15k
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
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LV52207AXA
Recommended EN PWM Timing at Ta=25°C, V =3.6V, unless otherwise specified
CC
Ratings
typ
Parameter
Symbol
Conditions
Unit
min
max
Dimming mode
selectable time
Tsel
Tw0
1
2.2
ms
s
Delay time to start digital
mode detection
Low time to switch to
digital mode
EN pin low time to
shutdown
100
260
2.5
20
Tw1
s
Toffen
Toffpwm
ms
ms
PWM pin low time to
shutdown
1-wire start time for
digital mode
programming
1-wire end time for digital
mode programming
Tstart
Tend
2
2
s
s
360
1-wire High time of bit 0
1-wire Low time of bit 0
1-wire High time of bit 1
1-wire Low time of bit1
DCDC startup delay
Th0
Tl0
Bit detection=0
2
180
360
360
180
s
s
s
s
ms
Bit detection=0
Bit detection=1
Bit detection=1
Th0 2
Tl1 2
2
Th1
Tl1
Tdel
5
Delay time of
Acknowledge
Tackd
Tack
2
s
s
Duration of Acknowledge
512
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LV52207AXA
Package Dimensions
unit : mm
WLCSP9, 1.31x1.31
CASE 567HX
ISSUE B
NOTES:
A
E
B
D
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. COPLANARITY APPLIES TO THE SPHERICAL
CROWNS OF THE SOLDER BALLS.
PIN A1
REFERENCE
MILLIMETERS
DIM
A
A1
b
D
E
MIN
MAX
0.625
0.26
2X
0.05
0.05
C
0.16
0.21
1.31 BSC
1.31 BSC
0.40 BSC
0.31
2X
C
TOP VIEW
e
A
C
0.10
C
C
RECOMMENDED
SOLDERING FOOTPRINT*
A1
PACKAGE
OUTLINE
A1
0.08
SEATING
PLANE
NOTE 3
SIDE VIEW
9X
0.20
e
9X
b
0.40
PITCH
e
0.05
0.03
C
C
A B
C
B
A
0.40
PITCH
DIMENSIONS: MILLIMETERS
*For additional information on our Pb-Free strategy and soldering
details, please download the ON Semiconductor Soldering and
MountingTechniques Reference Manual, SOLDERRM/D.
1
2
3
BOTTOM VIEW
LV52207AXA is as follows.
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LV52207AXA
Block Diagram
L1 : VLS3012E-4R7M (TDK), VLF504015-4R7(TDK)
VLS3012E-100M (TDK), VLF504015-100M(TDK)
D1 : MBR0540T1 (ON semi), NSR05F40 (ON semi)
C2 : GRM21BR71H105K (Murata), C1608X5R1H105K (TDK)
Fig2. Block Diagram
Pin Connection
TOP VIEW
1
2
3
LEDO LEDO
RT
A
2
1
B
C
PWM FCAP GND
EN
VIN
SW
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LV52207AXA
Pin Function
PIN #
Pin Name
RT
Description
A1
Connecting a resistor terminal for Full scale LED current setting
Constant Current Output_pin2
A2
LEDO2
LEDO1
PWM
FCAP
GND
EN
A3
Constant Current Output_pin1
B1
PWM dimming input (active High).
Filtering capacitor terminal for PWM mode
Ground
B2
B3
C1
C2
C3
1-wire control and Enable control input (active High).
Supply voltage.
VIN
SW
Switch pin. Drain of the internal power FET.
Pd-Max
Mounted on a specified board : 70mm70mm1.6mm (4 layer glass epoxy)
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LV52207AXA
LED Current Setting (max sink current)
LED_full current is set by an external resistor connected between the RT pin and ground.
I(LED_full)= 2113 (V(RT)/R(RT_res))
V(RT)
R(RT_res)
: RT_pin DC Voltage typ=0.6V
: RT_pin resistor
RT_res=63.4k : I(LED_full)=20mA
BRIGHTNESS CONTROL
The LV52207AXA controls the DC current of the dual channels. The DC current control is normally referred to as
analog dimming mode.
The LV52207AXA can receive digital commands at the EN pin (1-wire digital interface) (Digital Mode) and the PWM
signals at the PWM pin (PWM interface) (PWM Mode) for brightness dimming.
Dimming Mode Selection
Dimming Mode is selected by a specific pattern of the EN pin within Tsel(1ms) from the startup of the device every
time.
Digital Mode
To enter Digital Mode, EN pin should be taken high for more than Tw0(100s) from the first rising edge and keep low
state for Tw1(260s) before Tsel(1ms). When using Digital mode, the PWM pin should be kept high.
It is required sending the device address byte and the data byte to select LEDI. The bit detection is determined by the
ratio of Th and Tl(See Fig5). The start condition for the bit transmission required EN pin high for at least Tstart. The end
condition is required EN pin low for at least Tend. When data is not being transferred, EN pin is set in the “H” state.
These registers are initialized with shutdown.
Start up and Shutdown
The device becomes enabled when EN pin is initially taken high. The dimming mode is determined within Tsel and the
boost converter start up after Tdel. To place the device into shutdown mode, the SWIRE must be held low for Toff.
Digital MODE
Fig3. Start up and shutdown diagram (DIGITAL MODE)
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LV52207AXA
BOOST CONVERTER
The boost converter of the LV52207AXA integrates 40V 1.5A low side switch MOSFET and has a fixed switching
frequency of 0.6MHz. The boost output voltage is automatically set by regulating LEDO1_DC and LEDO2_DC .
In order to improve the boost efficiency at light load, SKIP mode is automatically enabled under light load condition.
Refer to Figure 14
1-Wire Programming
Figure 15 and Table 2 give an overview of the protocol used by LV52207AXA. A command consists of 24 bits,
including an 8-bit device address byte and a 16-bit data byte. All of the 24 bits should be transmitted together each time,
and the LSB bit should be transmitted first. In the LV52207AXA, the device address (DA7(MSB)to DA0(LSB)) is
specified as “10001111”. AKct is setting for the acknowledge response. If the device address and the data byte are
transferred on AKct=1, the ACK signal is sent from the receive side to the send side. The acknowledge signal is issued
when EN pin on the send side is released and EN pin on the receive side is set to low state.
Fig4. Example of writing data
Tl0 > Th0 * 2
Tl0 Th0
Low state(Bit=0)
Th1 > Tl1 * 2
Tl1 Th1
High state(Bit=1)
Fig5. Bit detection Diagram
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LV52207AXA
BITE
Register
DA7
DA6
DA5
DA4
DA3
DA2
DA1
DA0
D15
BIT
23(MSB)
22
Description
1
0
0
0
1
1
1
1
21
20
19
18
17
16
15
14
Device
Address
(0x8F)
Data bit 15 No information. Write 0 to this bit.
Data bit 14 No information. Write 0 to this bit.
Data bit 13 No information. Write 0 to this bit.
Data bit 12 No information. Write 0 to this bit.
Data bit 11 No information. Write 0 to this bit.
0 = Acknowledge disabled
1 = Acknowledge enabled
Data bit 9
D14
D13
D12
D11
13
12
11
AKct(D10)
10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
9
8
7
6
5
4
3
2
1
Data
Data bit 8
Data bit 7
Data bit 6
Data bit 5
Data bit 4
Data bit 3
Data bit 2
Data bit 1 LSB of brightness code
Data bit 0 No information.
0(LSB)
Table1. Bit Description
LED Current setting
RT resistor=63.4K (20mA)
LED current = I(LED_full) x code/255= LEDO1current=LEDO2current
D3
0
0
D2
0
0
code
0
1
D8
0
0
D7
0
0
D6
0
0
D5
0
0
D4
0
0
D1
0
1
LED Current(mA)
0 Unavailable
0.22
2
0
1
0.30
0
0
0
0
0
0
3
0
1
0.38
0
0
0
0
0
1
4
1
0
0.47
0
0
0
0
0
0
5
1
0
0.55
0
0
0
0
0
1
6
1
1
0.63
0
0
0
0
0
0
7
1
1
0.70
0
0
0
0
0
1
8
0
0
0.78
0
0
0
0
1
0
9
0
0
0.86
0
0
0
0
1
1
10
0
1
0.94
0
0
0
0
1
0
.
.
.
.
.
.
246
247
248
249
250
251
252
253
254
255
1
1
0
0
0
0
1
1
1
1
1
1
0
0
1
1
0
0
1
1
19.30
19.38
19.46
19.54
19.61
19.69
19.77
19.84
19.93
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
1
0
1
20 *Default
Table2. Data Register vs LED current sink
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LV52207AXA
PWM Mode
The dimming mode is set to PWM mode when it is not recognized as a digital mode within Tsel. The LV52207AXA
can receive the PWM signals at the PWM pin (PWM interface)(PWM Mode) for brightness dimming. When using
PWM interface, the EN pin should be kept high. If EN pin is H, PWM pin alone is used to enable and disable the IC.
When EN pin is H and PWM pin is H , this IC is enable. When EN pin more than 2.5ms are low or when PWM pin
more than 20ms are low, the IC is disable.
Fig6. Start up and shutdown diagram (PWM MODE)
LEDO1 or LEDO2 UNUSED
If only one channel is used, a user can be made to OFF by connecting to ground the unused channel. If LEDO1 pin and
LEDO2 pin are connected to ground, dcdc will not start up.
Over Voltage Protection ( SW OVP)
SW pin over-voltage protection is set at 37.5V. This IC monitors the Voltage at SW pin. When the voltage exceed OVP
threshold, the switching converter stops switching.
If SW terminal voltage exceeds a threshold Vovp (37.5V typ) for 8 cycles, boost converter enters shutdown mode. In
order to restart the IC, SWIRE signal is required again.
Over Voltage Protection ( LEDO OVP)
LED pin over-voltage protection is set at 4.5V(rise) 3.5V(fall). This IC monitors the Voltage at LEDO1 pin and
LEDO2 pin. When the voltage exceed LEDO OVP threshold, the switching converter stops switching. LED current
sink keep.
Open LED Protection
< When one LED string becomes open.>
If one LED string is open, open channel voltage is about ground, the boost output voltage is increased and other
LEDO channel voltage is increased. When SW pin voltage is reached the SW OVP threshold the LV52207AXA’s
switching converter stops switching. When other LEDO pin voltage is reached the LEDO OVP threshold, the
LV52207AXA’s switching converter stops switching.
< When both LED strings become open.>
If both LED strings are open, LEDO1 pin voltage and LEDO2 pin voltage is about ground, and the boost output
voltage is increased
When SW pin voltage is reached the SW OVP threshold the LV52207AXA’s switching converter stops switching.
Over Current Protection
Current limit value for built-in power MOS is around 1.5A. The power MOS is turned off for each switching cycle
when peak current through it exceeds the limit value.
Under Voltage Lock Out (UVLO)
UVLO operation works when VIN terminal voltage is below 2.2V.
Thermal Shutdown
When chip temperature is too high, boost converter is stopped.
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LV52207AXA
Application Circuit Diagram
PWM dimming mode
EN pin can be used to enable or disable
PWM dimming mode
PWM pin can be used to enable or disable
1-wire dimming mode
PWM pin can be used to enable or disable
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LV52207AXA
1-wire dimming mode
EN pin can be used to enable or disable
1-wire dimming mode and PWM dimming mode (CABC)
Notes start-up sequences
During Tw0 period of 1-wire, it is necessary to make PWM "High".
Fig7. Various application circuit diagram
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LV52207AXA
Typical Characteristics (VIN=3.6V, L=10uH, T=25degC, unless otherwise specified)
Efficiency vs PWM DIMMING (20mA/string) Fig8
PWM DIMMING Fig9
1-wire DIMMING Fig10
CABC DIMMING Fig11
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LV52207AXA
START UP WAVEFORM Fig12
SHUTDOWN WAVEFORM Fig13
SWITCHING WAVEFORM Fig14
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LV52207AXA
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15
LV52207AXA
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LV52207AXA
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LV52207AXA
ORDERING INFORMATION
Device
Package
Shipping (Qty / Packing)
5000 / Tape & Reel
WLP9 (1.311.31)
(Pb-Free / Halogen Free)
LV52207AXA-VH
ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiariesin the United States
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further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitabilityof its products for any particular purpose,
nor does SCILLC 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 SCILLC data sheets and/or specifications can
and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
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