APW8739

APW8739
4-Channel LED Backlight Converter with SMBus Controlled
Features
General Description
•
4 channels
The APW8739 is a high efficiency driver for 4 channels of
•
6V to 24V Input Voltage Supply
LEDs. It’s a wide range input voltage operating from 6V to
24V. It’s capable of driving typically 68 (17x4) pieces of 3.
•
Drive up to 68(17x4) White LEDs
(3.5V/180mA each)
5V/180mA LEDs. It contains 4 channels of voltage controlled current sources with typical current matching of
•
Current Match (balance) +/- 1% (Typ.)
+1%. It’s built internal Rds(on) 0.25 ohm (typ.) with current mode control. The APW8739 be able to control LED
•
Current Accuracy +/-1% (Typ.)
•
current by SMBus interface. SMBus control LED current
made had PWM, DC and Mixed-mode. The APW8739 has
Built internal SW MOSFET Rds(on) 0.25 ohm (typ.)
•
SMBus control to program below:
enable, shutdown function and Fault detection function.
The APW8739 features extensive protection functions that
include UVLO, Current limit, LED strings open and short
circuit detections, Output Over-Voltage Protection (OVP)
-LED Current: 22.58mA to 180 mA
-Switching Frequency: 200KHz to 900KHz
and Over Temperature Protection (OTP). The APW8739
is available in TDFN5x5-16 Packages.
-Dimming mode: PWM, DC and Mixed-mode
•
Enable / Shutdown Function and Fault indication
•
Built in UVLO Control Detection on VIN
•
Built in Protection function:
Applications
-Built in Internal MOSFET Current Limit function
about 3.3A (Typ.)
•
-String Open / Short Circuit Detection
AIO Backlight
-Over Voltage Protection
-Over Temperature Protection
•
Available in TDFN 5x5-16 Packages
•
Halogen and Lead Free Available (RoHS Compliant)
Simplified Application Circuit
VIN
VOUT
VIN
LX
EN
OVP
PWM
FAULT
GND
APW8739
SMBDAT
SMBCLK
SMBDAT
SMBCLK
COMP
VDC
ISEN1
ISEN 2
ISEN 3
ISEN 4
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
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APW8739
Ordering and Marking Information
Package Code
QB : TDFN 5x5-16
APW8739
Assembly Material
Handling Code
Temperature Range
Package Code
Operating Ambient Temperature Range
I : -40 to 85oC
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
APW8739:
XXXXX - Date Code
APW8739
XXXXX
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020C for
MSL classification at lead-free peak reflow temperature. ANPEC defines ¡§Green¡¨ to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Pin Configuration
ISEN 1
1
16
OVP
ISEN 2
2
15
SMBDAT
ISEN 3
3
14
SMBCLK
ISEN 4
4
13
LX
GND
5
12
LX
FAULT
6
11
VIN
COMP
7
10
EN
VDC
8
9
PWM
TDFN 5x5 - 16
Top View
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APW8739
Absolute Maximum Ratings
Symbol
VIN
(Note 1)
Parame ter
Rating
Unit
V
VIN Input Vo lta ge (VIN to G ND)
-0.3 to 40
VFAULT
Fault Voltage to GND
-0.3 to 40
V
V DC
VDC Voltage to GND
-0 .3 to 6
V
V SMBCLK
SMBCLK Voltage to GND
-0.3 to 2 6.5
V
V SMBDAT
SMBDAT Volta ge to GND
-0.3 to 2 6.5
V
I ISEN1~ 4
IS EN1 – ISE N4 L ED Curre nt
VI/O
TJ
20 0
mA
VEN, VPWM, VCOMP ,VFAULT to G ND Volta ge
-0.3 to 44
V
VSEN1 , VSEN2, VS EN3, VSEN4, VOUT to G ND Volta ge
-0.3 to 66
V
VLX to GND Voltage
-0.3 to 72
V
PGND to AGND Voltage
- 0.3 to 0.3
V
150
°C
- 65 to 15 0
°C
260
°C
Maxi mum Junction Te mperature
TSTG
Sto rage Temperature
TSD R
Maxi mum Le ad Sold ering Temperature (1 0 Seconds)
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics (Note 2)
Symbol
θJA
θJC
Parameter
Typical Value
Junction-to-Ambient Resistance in free air
TDFN5X5 -16
28.8
TDFN5X5 -16
4.4
Unit
°C/W
Junction-to-Case Resistance in free air
°C/W
Note 2: θJA and are measured with the component mounted on a high effective the thermal conductivity test board in free air. The
thermal pad of TDFN5x5-16 package is soldered directly on the PCB.
Recommended Operating Conditions (Note 3)
Symbol
VIN
Parameter
Range
VIN Input Voltage (VIN to GND)
VOUT
Converter Output Voltage
ILED
Output LED Current per string
VEN
Enable Voltage
FSW
Boost SW Frequency
TA
TJ
Unit
6 to 24
V
~65
V
20~180
mA
5
V
200 ~ 900
kHz
Ambient Temperature
-40 to 85
°C
Junction Temperature
-40 to 125
°C
Note 3: Refer to the typical application circuit
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
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APW8739
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over VIN=12V, VENA =5V and TA= -40 to 85 oC. Typical values are at TA=25oC.
Symbol
Parameter
Test Conditions
Min
APW8739
Typ
Max
Unit
Supply Voltage And Current
VIN
Input Supply Voltage Range
6
-
24
V
IQ
Quiescent Current
-
3.3
-
mA
ISHD N
Shutdown Current
VIN =6V, EN=0V
-
-
18
uA
High Logic
2
-
-
V
Low Logic
-
-
0.8
V
-
-
10
uA
2
-
-
V
-
-
0.8
V
-
0.01
1
uA
Enable and PWM Dimming
EN and PWM Logic
EN and PWM Leakage Current
SMBDAT and SMBCLK Logic
High Logic
Low Logic
SMBus Control Timing (Note 4)
SMBDAT
Current
and
SMBCLK
Leakage
FSMB
SMBus Operating Frequency
10
-
100
KHz
TBUF
Bus free time between stop and start
condition
4.7
-
-
us
4
-
-
us
4.7
-
-
us
4
-
-
us
T_HD_STA
Hold time after start condition
T_SD_STA
Repeated start condition setup time
T_SD_STO
Stop condition setup time
T_HD_DAT
Data hold time
300
-
-
ns
T_SU_DAT
Data setup time
250
-
-
ns
T_TIMEOUT
Detect clock low timeout
25
-
35
ms
T_LOW
Clock low period
4.7
-
-
us
T_HIGH
Clock high period
4
-
50
us
-
-
25
ms
-
-
10
ms
T_LOW_SEXT
T_LOW_MEXT
After this period, the first clock is generated
Slave device cumulative clock low
extend time_slave
Master device cumulative clock low
extend time_master
TF_SMB
Fall time of SMB DAT/CLK
-
-
300
ns
TR_SMB
Rise time of SMB DAT/CLK
-
-
1000
ns
-
3
500
ms
T_SMB_POR Power on reset of SMB
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
Time in which a device must be operation after
power on reset
4
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APW8739
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over VIN=12V, VENA =5V and TA= -40 to 85 oC. Typical values are at TA=25oC.
Symbol
Parameter
Test Conditions
Min
APW8739
Typ
Max
Unit
Under Voltage Lockout
VUVLO
Under Voltage Lockout Threshold
-
4.3
-
V
ΔV UVLO
Under Voltage Lockout Hysteresis
-
200
-
mV
-10
-
10
%
-
400
-
kHz
200
-
900
kHz
Oscillator
FSW_ACC
Operation Frequency
Boost operation at PWM mode, FSW =400kHz
FSW
Switching Frequency
Boost operation at PWM mode
FSW_RG
Switching Frequency S etting Range
LED Current
ISEN_LEK_I
Leakage Current of ISEN
VSEN=50V, I SEN=0uA
-
20
-
uA
VSEN_MIN
Minimum SEN Regulation Voltage
ISEN=120mA
-
0.5
-
V
I SEN_MAX
Maximum SEN Current
-
-
180
mA
200
-
1000
Hz
FPWM
Dimming Frequency
I SEN_ACC
ISEN Current Accuracy
PWM duty=100%, I SEN=120mA
-3
-
+3
%
ISEN_MAT
ISEN Current Matching
PWM duty=100%, I SEN=120mA
-2
-
+2
%
-
0.1
-
V
-
0.2
-
V
-
5.6
-
V
-
26
-
KHz
-
90
-
%
-
0.25
0.5
Ω
VSEN_OPEN Light Bar Open Threshold
Unused threshold
V SEN_SHORT Light Bar Short Threshold
FPWM_LED
Mixed Mode Dimming Frequency
When Dimming Duty < 25%
Internal Power Switch
DMAX
Max duty cycle
R ON
Power Switch on Resistance
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
VDC=5V, I SW_BST =100mA
5
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APW8739
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over VIN=12V, VENA =5V and TA= -40 to 85 oC. Typical values are at TA=25oC.
Symbol
P aram eter
Tes t Condit ions
Min
APW 8739
Typ
Max
Unit
O utput over Volta ge Protec tion
VOVP
O ve r Vol tag e Protecti on
OV P Selection b=11
-
65
-
V
2 .8
3.3
-
A
O ve r Tempe rature Pro tection
-
145
-
°C
Resume Temp.
-
125
-
°C
Pow er Sw it ch Curre nt Limit
IOCP
S witchin g Cu rrent Limit
Thermal Prot ection
T OTP
Copyright  ANPEC Electronics Corp.
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APW8739
Pin Description
PIN
NAME
FUNCTION
TDFN 5×5 -16
1
ISEN1
WLED Current source 1
2
ISEN1
WLED Current source 2
3
ISEN2
WLED Current source 3
4
ISEN3
WLED Current source 4
5
GND
6
FAULT
LED Operation status output
7
COMP
Compensation pin for error amplifier. Connect the compensation network to GND
Ground Pin
8
VDC
5V regulator supply for low voltage block. Connect 1uF capacitor to GND.
9
PWM
PWM brightness dimming control pin. Do not leave this pin floating.
10
EN
Enable control input pin. (active high)
11
VIN
Main power supply pin
12, 13
LX
Switching node of boost converter.
14
SMBCLK
Clock of SM Bus.
15
SMBDAT
Data of SM Bus.
16
VOUT
17
Exposed Pad
Over Voltage protection input pin. Based on internal resistor divider.
Ground.
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APW8739
Typical Operating Characteristics
LED Current VS Dimming Duty
100
140
90
120
LED Current (mA)
Efficiency (%)
Efficiency VS Input Voltage
80
70
60
50
16S4P,ILEDx=120mA,
VIN=12V,Freq=400KHz,PWM=3.3V
40
30
80
60
DC Mode
PWM Mode
Mixed Mode
40
0
12 13 14 15 16 17 18 19 20 21 22 23 24
0
10
20
40
50
60
70
80
90 100
Dimming Duty (%)
Efficiency VS Input Voltage
LED Current VS SMBus Duty
140
Channel 1
Channel 2
Channel 3
Channel 4
16S4P,VIN=12V,Freq=400KHz
LED Current (mA)
120
130
120
110
100
16 LEDs/CH , ILEDx=120mA
Freq=400KHz,PWM=3.3V
90
100
80
60
40
Mixed Mode
DC Mode
20
0
12 13 14 15 16 17 18 19 20 21 22 23 24
0
10
20
30
40
50
60
70
80
90 100
Dimming Duty (%)
Input Voltage (V)
LED Current VS Dimming Freq
Quiescent Current VS Input Voltage
140
1.4
ILED=120mA
Freq=400KHz,PWM=3.3V
120
EN=High Level
1.3
100
Current (mA)
LED Current (mA)
30
Input Voltage (V)
140
LED Current (mA)
100
20
150
80
16S4P,VIN=12V,Freq=400KHz
Dimming Freq=200Hz
80
60
40
1 KHz
200 Hz
20
0
0
10
20
30
40
50
60
70
80
1.1
1
0.9
0.8
90 100
Dimming Duty (%)
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
1.2
6
8
10
12
14
16
18
20
22
24
Input Voltage (V)
8
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APW8739
Typical Operating Characteristics
VDC Voltage VS Input Voltage
5.2
VDC Voltgae (V)
5.15
5.1
5.05
5.0
4.95
4.9
4.85
4.8
6
8
10
12
14
16
18
20
22
24
Input Voltage (V)
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APW8739
Operating Waveforms
Power on PWM – DC Mode
Normal Operation
CH1
CH1
CH2
CH2
CH3
CH3
CH4
CH4
VIN=12V,Freq=400KHz,ILEDx=120mA,16S4P
VIN=12V,Freq=400KHz,ILEDx=120mA,16S4P
CH1:VOUT-50V/div
CH2:VPWM-5V/div
CH3:VLX-50V/div
CH4:IOUT-500mA/div
Time:20ms/div
CH1:VOUT-50V/div
CH2:VIN-10V/div
CH3:VFAULT-5V/div
CH4:IL-1A/div
Time:2us/div
Power on PWM – PWM Mode
Power off PWM - PWM Mode
CH1
CH1
CH2
CH2
CH3
CH3
CH4
CH4
VIN=12V,Freq=400KHz,ILEDx=120mA,16S4P,
PWM=200Hz/50% Duty
CH1:VOUT-50V/div
CH2:VPWM-5V/div
CH3:VLX-50V/div
CH4:IOUT-500mA/div
Time:20ms/div
CH1:VOUT-50V/div
CH2:VEN-5V/div
CH3:VLX-50V/div
CH4:IOUT-500mA/div
Time:20ms/div
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
VIN=12V,Freq=400KHz,ILEDx=120mA,16S4P,
PWM=200Hz/50% Duty
10
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APW8739
Operating Waveforms (Cont.)
Power off SMBus
Power on SMBus
CH1
CH1
CH2
CH2
CH3
CH3
CH4
CH4
VIN=12V,Freq=400KHz,ILEDx=120mA
16S4P,DC Mode
CH1:VOUT-50V/div
CH2:VDATA-5V/div
CH3:VLX-50V/div
CH4:IOUT-500mA/div
Time:20ms/div
CH1:VOUT-50V/div
CH2:VDATA-5V/div
CH3:VLX-50V/div
CH4:IOUT-500mA/div
Time:20ms/div
Power off EN
OCP
CH1
CH1
CH2
CH2
CH3
CH3
CH4
CH4
VIN=12V,Freq=400KHz,ILEDx=120mA
16S4P,DC Mode
VIN=12V,Freq=400KHz,ILEDx=80mA,16S4P
CH1:VOUT-50V/div
CH2:VEN-5V/div
CH3:VLX-50V/div
CH4:IOUT-500mA/div
Time:20ms/div
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
CH1:VOUT-50V/div
CH2:VIN-10V/div
CH3:VFAULT-10V/div
CH4:ILX-2A/div
Time:10ms/div
11
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APW8739
Block Diagram
VIN
VOUT
LX
VIN
EN
OVP
UVLO
Rupper
Runder
VDC
5V
Linear
Regulator
Vref
Control
Logic
SMBUS
Control
Over Temperature
Protection
Protection
Logic
PWM
Generator
FAULT
Oscillator
Vref
Lowest
Current
Source
Voltage
Dectection
PWM
SMBDAT
Soft
Start
gm
COMP
SMBus
Control
DAC
ISEN 1
.
.
.
.
ISEN 4
SMBCLK
.
.
.
.
Current
Mirror
Circuit
GND
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APW8739
Typical Application Circuits
L1
33uH
VIN
D1
VOUT
R1
2R2
C1
10uF x2
VIN
EN
PWM
C2
1uF
LX
OVP
FAULT
GND
C5
2.2uF x 3
APW8739
SMBDAT
SMBCLK
SMBDAT
SMBCLK
COMP
VDC
R2
0R
C3
100nF
ISEN1
ISEN2
ISEN3
ISEN4
C4
1uF
Figure 1: Typical Application
Fault
L1
33uH
VIN
R1
2R2
C1
10uF x2
D1
VOUT
Q1
VIN
EN
PWM
C2
1uF
LX
OVP
FAULT
GND
C5
2.2uF x3
APW8739
SMBDAT
SMBCLK
SMBDAT
SMBCLK
COMP
VDC
R2
0R
C3
100nF
ISEN1
ISEN2
ISEN3
ISEN4
C4
1uF
Figure 2: External P-Mosfet Isolation Application
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APW8739
Function Description
The APW8739 is a high efficiency driver for 4 channels of
LEDs. It contains an adjustable-frequency current-mode
PWM step-up converter, a 5V linear regulator, dimming
control circuit. The APW8739 contains 4 channels of voltage controlled current sources with typical currents
matching of ±2%, which compensate for the non-uniformity effect of forward voltages variance in the LED stacks.
To minimize the voltage headroom and power loss in the
typical multi-strings operation, the APW8739 features a
dynamic headroom control that monitors the highest LED
forward voltage string and uses its feedback signal for
output regulation.
Mixed Mode Dimming: The output current dimming was
delay 2 cycles.
(i)
When 25% < PWM duty < 100% condition, LED
output current as DC Mode dimming.
(ii) PWM duty < 25% condition, LED output current
magnitude will change to PWM duty decided.
In addition, the using PWM dimming controlled want to
low duty dimming control. suggestion the minimum current is must more than 2mA.
LED Current Brightness Selection
The APW8739 allows user to input the duty directly, instead of using signal of PWM pin for calculation. If users
Enable and PWM
Driving EN to the ground places the APW8739 in shutdown mode. When in shutdown, the internal gate driver
turns off. The PWM can be used for PWM input for dimming.
If the dimming function is not used, connect PWM and EN
together. The EN and PWM pins cannot be floating, thus a
pull-low resistance may needs to be added.
would like to input the duty for the DC/ mix mode dimming,
configure register as below table 1.
Table 1: LED Brightness Register
Current Source
Address
Bit
N am e
Des cription
00h
[2]
LED Brightness
Selection
Note 5
04h
[7:0]
LED Brightness
Control
0%(0x00h) to
100%(0xFF h)
The APW8739 integrated 4 matched current sources to
maintain uniform LED brightness for LCD backlight app
lication. The maximum LED current is set by register ad
Note 5:
dress 02h. LED current adjust range is from 22.58mA to
180mA.
Bit [2]=0 :Dimming control is by PWM pin.
Bit [2]=1 :Dimming control is using register address 04h.
Dimming Controls
The APW8739 allows 3 ways for controlling the output
current. DC Mode Dimming: The LED current magnitude
is set by maximum current and PWM duty relationship.
PS: There is no 2 cycles delay when using this register
setting to 1.
Dimming Mode Configuration Register
ILED=IMAX x PWM Duty
The APW8739 provides control configuration for the users.
Its configure registers as below table 2.
PWM Mode Dimming: Using PWM signal to control LED
current, and the LED current frequency is synchronized
the PWM frequency. As shown in figure 3.
Table 2: Dimming Mode Configure Register
Address
PWM
00h
Bit
[1:0]
Name
Description
b00: PWM Mode
Dimming mode
b01: DC Mode
selection
b10: Mixed Mode
LED
Current
PS: If the dimming mode command is set b11, the dimming mode is still mixed mode.
100%
Figure 3: PWM Mode Dimming
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APW8739
Function Description
5V Low Dropout Regulator
Over-Temperature Protection (OTP)
A 5V linear regulator is integrating to supply internal circuit and driver. The VDC pin was requires a bypass capacitor of 1uF or more for the regulation. VDC pin had
30mA sourcing capability.
The over-temperature circuit limits the junction temperature of the APW8739. When the junction temperature exceeds 145 oC, a thermal sensor turns off the power
MOSFET, allowing the devices to cool. The thermal sensor allows the converters to start a soft-start process and
to regulate the output voltage again after the junction temperature cools by 20oC. The OTP is designed with a 20oC
hysteresis to lower the average Junction Temperature
(TJ) during continuous thermal overload conditions, in-
Inrush Current Control and Soft-start
The APW8739 integrates independent inrush current control and soft-start functions. When receiving the STOP bit
signal, the APW8739 will start to check PWM duty and
then enter soft-start. It’s several tens of milliseconds processing soft start and limit less than 2A.
creasing the lifetime of the device.
Under-Voltage Lockout
Short Circuit Protection (SCP)
The Under-Voltage Lockout (UVLO) circuit compares the
input voltage with the UVLO threshold (4.3V, typical) to
ensure the input voltage is high enough for reliable
operation. The 0.2V (typical) hysteresis prevents supply
transients from causing a restart.
The APW8739 integrates the LED strings short circuit protection (SCP) circuit. Such circuit monitors the voltage on
each channel. When any channels exceed short-circuit
threshold (5.6V typical), the device disable current
channels. All the other good channels work normally. The
APW8739 short circuit protection setting by register address 03h.when bit [2] is setting 1 then the function is
disabling. On the contrary, the bit [2] is setting to 0, the
short strings LED mode will be choose Reset mode or
Latch mode. The reset mode is mean LED strings from
short condition change to normal then LED current will be
recovery to normal state. User is setting latch mode once
LED strings short condition is occurs, the particular channel will be off. The short circuit protection register setting
is below table 3.
Over-Current Fault
The address 00h bit [4] is setting OCP function. When
that bit set to 1, the device internal counter is start to
check OCP process. If OCP continues to occur 128 times,
the fault pin will be pulling high. On the contrary, the OCP
status is always continues to occur. The over current fault
setting is below table 4.
Table 4: Over Current Fault Setting Register
Table 3: Short Circuit Protection Setting Register
Address
Bit
03h
[1]
[2]
Name
Short Strings
LED mode
Short strings
LED Enable
Description
Address
Bit
Name
00h
[4]
OCP Fault
Description
0: Disable
1: Enable
0: Reset Mode
1: Latch Mode
0: Enable
1:Disable
Open Circuit Protection (OCP)
The output voltage of APW8739 is regulated according to
the minimum current source voltage on all the strings in
use. If one or more strings are open, the respective ISEN
are pulled to GND (0.1V typical). If any ISEN is below target current, the corresponding current source is disabled.
The unaffected LED strings still operate normally. If all
strings are open, the APW8739 boost the output voltage
of converter high to the OVP threshold and then the device is latched.
Copyright  ANPEC Electronics Corp.
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APW8739
Function Description
Switch Frequency
LED Current Setting
The APW8739 had adjusted LED current function. It’s
setting by register of the address 02h bit [7:0].The LED
current setting is below table 8.
The APW8739 switch frequency is adjust by register of
the address 01h bit [3:0].The switch frequency setting
range is from 200KHz to 900KHz (bit [3:0] is setting 02h
to 09h).The switch frequency setting is below table 5.
Table 8: LED Current setting Register
Table 5: Switch Frequency Setting Register
Address
01h
Bit
Name
Note 6
Description
0: 2.2A
1: 3.3A
Over-Voltage Protection (OVP)
The APW8739 had over voltage protection. The OVP value
is setting by register of the address 01h bit [6:5], the OVP
is can be selection which table 7 below. When the load is
open, the converter unceasingly boosts the output voltage high. Therefore, the device is latched in OVP protection is occurs.
Table 7: Over Voltage Protection Setting Register
Address
01h
Bit
Name
[6:5]
Over
Voltage
Note 7
Fault Protection
The APW8739 fault protection function can protect in abnormal state. The fault pin will output a voltage level as
same with VIN, which forcing the P-MOSFET to be turned
off in P-MOSFET application circuit and to prevent the short
current to damage IC or components. The fault pin output
voltage be able to clamp to VIN minus 6V make sure the
P-MOSFET can be fully turn on at normal operation
condition. In addition, the fault function can be choose
disable or enable, it’s written register address 03h bit [7].
If written to 1 the fault function is enable, on the contrary,
the fault function is disable. W hen fault function is
happened, the register address 03h bit[0] will be 0 change
to 1.If the fault function want to cleared, User could setting
register address 03h bit[3] written to 1.Finally, The fault
protection setting show as below table 9.
When the Fault pin will be turns high condition has
schottky diode shorted, output voltage shorted to ground
and OCP fault setting is enable.
Table 6: Current Limit Setting Register
Current
Limit
LED
current
setting
The APW8739 had adjusted LED current function. It’s
setting by register of the address 02h bit [7:0].The LED
current setting is below table 8.
The APW8739 had current limit protection. The current
limit is setting by register of the address 01h bit [4].The
current limit setting is below table 6. The APW8739 is
monitoring the inductor current of peak current to prevent
over load. When current limit is occurs then current peak
is clamp to setting value.
[4]
[7:0]
LED Current Setting
Current Limit
01h
02h
Description
The adjust LED current resolution is around 0.706mA.
The adjust switch frequency resolution is around 100
KHz.
Name
Name
Note 7:
(1): Bit [7:0] =00h: LED current setting=0mA
(2): Bit [7:0] =01h ~ 20h: LED current setting=22.58mA
(3): Bit [7:0] =FFh: LED current setting=180mA
Note 6:
(1): Bit [3:0] =00h ~ 02h: Switch frequency is setting=200 KHz
(2): Bit [3:0] =04h: Switch frequency is setting=400 KHz
(3): Bit [3:0] =09h ~ 0Fh: Switch frequency is setting=900 KHz
Bit
Bit
Description
Switch
[3:0]
Frequency
Address
Address
Description
b00: 35V
b01: 50V
b10: 60V
b11: 65V
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APW8739
Function Description
Table 9: Fault Protection setting Register
Address
03h
Bit
Name
Default Value
Description
R/W
[0]
M onitor fault
condition
---
Detect fault condition happen or not (Read only).
R
[3]
Fault flag
could be
cleared by
SMBus
Original State (0)
[7]
Fault function
enable
Enable (1)
0:Keep the original state
1:Clear fault flag
R/W
0:Disable
1:Enable
R/W
SMBus Dimming
The APW8739 had an SMBus Dimming function setting by register address 04h bit[7:0].The dimming control range is
from 0% to 100%,the dimming control current resolution to every step is around 0.392%. The SMBus dimming control
setting function register as below table 10.
Table 10: SMBus Dimming Control setting Register
Address
Bit
Name
Default Value
04h
[7:0]
SMBus
Dimming
Control
0%
Description
0x00:0%
0xFF :100%
Resolution
R/W
0.392%
R/W
LED Current Written Check
The APW8739 had LED current check function. The function is providing users to check LED current greater than zero.
The LED current is zero than the bit will be changed to 1. The LED current check function register as below table 11. In
additional, the register address 06h bit[6:4] is able to read vendor code ID.
Table 11: LED Current check setting Register
Address
Bit
Name
Default Value
06h
[7]
LED Current
Check
LED Current=0 (1)
06h
[6:4]
Vendor ID
Description
0: LED Current Setting>0
1: LED Current Setting=0
Vendor ID (b110) Vendor ID
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R/W
R
R
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APW8739
Function Description
Table 12: Register Map
Slave Address : b0110001
Address
Bit
00h
[1:0]
[2]
01h
Nam e
Dimming
Mode
Selection
LED
Brightness
Selection
[4]
OCP Fault
[7]
OVP Reset
[3:0]
Boost
Switching
Frequency
[4]
Switching
Current
Limitation
Selection
Over Voltage
[6:5] Protection
Selection
Default
Value
3.3A(b1)
65V
(b11)
[7:0]
LED Current
Setting
0mA
(0x00h)
03h
[0]
Fault Flag
--
[1]
[2]
[3]
Fault Flag
Clear
Resolutio
n
Range
b00:PWM Mode
PWM
b01:DC Mode
--Mode(b01)
b10:Mixed Mode
b0: depend on the status of PW M pin
PWM
b1: depend on address:04h data
--Pin(b0)
(note 8)
b0: Disable
Disable(0)
--b1: Enable
b0: Disable
--Disable(0)
b1: Enable
0x04h:400kHz
200kHz(0x02h)
Between the code 0x00h and 0x02h ~100kHz
to
400kHz
are equal to 200kHz.
(0x02h to
900kHz(0x09h)
(0x04h)
Between the code 0x09h and 0x0fh 0x09h)
are equal to 900kHz.
02h
Short LED
Protection
Latch
Selection
Short LED
Protection
Description
Boost Switch Current Lim itation.
b0:0.6667x3.3A
b1:3.3A
Original
State
(0)
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
--
R/W
R/W
R/W
R/W
R/W
Boost
Output
Over
Voltage
Protection.
b11:65V
35V(b00) to 65V
-R/W
b10:60V
(b11)
b01:50V
b00:35V
Control the Max Current
0xFFh:180m A
180mA(0xFFh)
~0.706m
0x20h:22.58mA
to
A(0xFFh
R/W
0x00h:0mA
22.58m A(0x20h
to 0x20h)
Between the code 0x01h and 0x20h
)
are equal to 22.58mA
Monitor Fault Condition.
0: not detected fault
--R
1: detected fault
(Note 9)
Reset Mode 0: Reset Mode
(0)
1: Latch Mode
Enable
(0)
--
R/W
0: Enable
1: Disable
Fault Flag Could is Cleared By
SMBus.
0: keep the original state
1: clear fault flag
18
--
--
R/W
--
--
R/W
--
--
R/W
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APW8739
Function Description
Table 12: Register Map
Slave Address : b0110001
Address
04h
Bit
Name
Default
Value
[7]
Fault Function
enable
Enable
(1)
[7:0]
LED
Brightness
Control
0%(0x00h)
06h
[6:4]
06h
[7]
Description
Fault Function Enable.
0:Disable
1:Enable
0x00h: 0%
0xFFh: 100%
Resolution
Range
R/W
--
--
R/W
0.392%
0%(0x00h) to
100%(0 xFFh)
R/W
--
--
R
--
--
R
Vendor ID
Vendor ID
(b110)
LED Current LED Current 0:LED Current Setting > 0
Check
(0/1)
1:LED Current Setting = 0
Vendor ID
Note 8: When dimming mode is set as direct PWM, brightness must be controlled by PWM pin only.
Note 9: There are 2 fault conditions which activate the flag. One is the switching pin shorted to ground; another is
the shorted schottky diode.
SMBus Write Timing Sequence
Write 1 byte
(Command byte is sent after the address and detemines which register receives the data that follows the command byte.)
Slave Address
R /W
S0 1 1 0 0 0 1 0 A
Register Address
Command Byte
Register Data
A
AP
Data Byte
SMBus Read Timing Sequence
Read 1 byte
(Command byte is sent after the address and detemines which register is accessed. After a start, the Device address is sent
again and LSB is set to logic 1. Data defined by command byte then is sent by APW8739.)
Slave Address
R /W
S 0 1 1 0 0 0 1 0 A
Register Address
Command Byte
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
R /W
A S
19
Slave Address
1 A
Register Data 1
Data Byte 1
A
P
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APW8739
Timing Diagram
SMBCLK
tLOW
tR
tF
VIH
VIL
tHIGH
tHD;STA
SMBDAT
tHD;DAT
tSU;DAT
tSU;STA
tSU;STO
VIH
VIL
tBUP
S
P
S
P
Figure 4: SMBus Common AC Specification
Stop
Start
CLKACK
CLKACK
TLOW:MEXT
TLOW:MEXT
TLOW:MEXT
SMBCLK
SMBDAT
Figure 5: Timing Diagram of SMBus Timeout
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APW8739
Timing Diagram
VIN
After the point of UVLO
EN
sEn_SMBUS
256us
SMBUS is enable after the delay of EN
2ms
After SMBUS is reset, SMBUS is ready for read / write
sEn_SMBRW
SMBus
Command
DATA
(*please check SMB package)
PWM
ILED
System will start after the stop signal and the duty is ready
Figure 6: Power On Sequence
VIN
EN
before the point of UVLO
sEn_SMBUS
sEn_SMBRW
sEn_SMBRW is disable when EN is low
PWM
ILED
ILED will be off when En is low
Figure 7: Power Off Sequence
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APW8739
Application Information
Where VOUT is the maximum output voltage, VIN is the
minimum input voltage, FSW is the operating frequency
Supply Voltage Capacitor Selection
The APW8739 equips a built-in LDO linear regulator to
provide the internal logic of IC power. The output of LDO
and IOUT is the sum of current from all LED strings. The
boost converter operates in DCM over the entire input
is the pin out of VDC. The VDC pin is recommended to
connect at least a 1uF bypass capacitor. The bypass ca-
voltage range when the inductor value is less than this
value, L. with an inductance greater than L, the converter
pacitor should be X5R or X7R type to assure the bypass
capacitance remains stable in over voltage or over
temperature.
operates in CCM at the minimum input voltage and may
be discontinuous at higher voltages.
Input Capacitor Selection
The inductor must be selected with a saturated current
rating that is greater than the peak current and the peak
The ceramic capacitors are recommended for input capacitor applications. Low ESR will effectively reduce the
current must be below the current limit threshold (3.3A
typ) as provided by the following equation:
input voltage ripple caused by switching operation. Two
10uF capacitors are sufficient for most applications.
I PEAK =
Nevertheless, this value can be decreased for lower output current requirement. Another consideration is the voltage rating of the input capacitor must be greater than the
maximum input voltage.
VOUT × I OUT VIN × D × TSW
+
2× L
η × VIN
Where η is the efficiency of the power converter.
Moreover, the slope of inductor current also is considered as the following question.
Diode Selection
Schottky diodes are recommended for most applications
because of their fast recovery time and low forward voltage.
L>
Power dissipation, reverse voltage rating, and pulsating
peak current are important parameters for consideration
VOUT − VIN
1.68×106
Please pay attention for it , the inductance minimum value
when making a Schottky diode selection. Make sure that
the diode’s peak current rating exceeds IPEAK an reverse
does not smaller than the criteria.
voltage rating exceeds the maximum output voltage.
Output Capacitor Selection
Output ripple voltage is an important index for estimat-
Inductor Selection
ing the performance. This portion consists of two parts,
one is the ESR voltage of output capacitor, and another
The value of the inductance, L, can be approximated by
the following equation, where the transition is form dis-
part is formed by charging and discharging process of
output capacitor. Refer to figure , evaluate Δ VOUT1 by
continuous conduction mode (DCM) to continuous conduction mode (CCM):
ideal energy equalization. According to the definition of
Q1, the Q value can be calculated as the following
The duty cycle, D, can be calculated as the following
equation:
D=
equation:
VOUT − VIN
VOUT
Q=
×
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
22
1 
1
×  I IN + ΔI L − I OUT
2 
2
1
 

 +  I IN − ΔI L − I OUT  
2
 

VIN
1
×
= C OUT × ΔV OUT1
VOUT FSW
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APW8739
Application Information
Where FSW is the switching frequency, and Δ IL is the
inductor ripple. Mover COUT to the left side to estimate
the value of Δ VOUT1 as the following equation:
ΔVOUT1 =
D × I OUT
η × C OUT × FSW
Then, take the ESR into consideration, the ESR voltage
can be determined as the following equation:
V × D × TSW 
I
ΔVESR =  OUT + IN
 × R ESR
2L
1− D

Finally, the total output ripple Δ VOUT is combined from
the Δ VOUT1 and Δ VESR. In the general application, the
output capacitor is recommended to use a 47uF
electrolytic capacitor.
ΔIL
Input Current
Inductor Current
Output Current
Time
(1-D)TS
Output Ripple
Voltage (ac)
Time
ΔVOUT1
Figure 7: The Output Ripple Voltage without the Contribution of ESR
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APW8739
Package Information
TDFN5x5-16
D
A
E
Pin 1
D2
A1
e
A3
NX
E2
aaa C
Pin 1 Corner
KL
S
Y
M
B
O
L
TDFN5*5-16
MILLIMETERS
INCHES
MIN.
MAX.
MIN.
MAX.
A
0.70
0.80
0.028
0.031
A1
0.00
0.05
0.000
0.002
A3
0.20 REF
0.008 REF
b
0.20
0.30
0.008
0.012
D
4.90
5.10
0.193
0.201
0.150
D2
3.60
3.80
0.142
E
4.90
5.10
0.193
0.201
E2
4.30
4.50
0.169
0.177
e
0.50 BSC
L
0.35
K
0.20
aaa
Copyright  ANPEC Electronics Corp.
Rev. A.2 - Dec., 2015
0.020 BSC
0.014
0.45
0.018
0.008
0.08
0.003
24
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APW8739
Carrier Tape & Reel Dimensions
P0
P2
P1
A
B0
W
F
E1
OD0
K0
A0
A
OD1 B
B
T
SECTION A-A
SECTION B-B
H
A
d
T1
Application
TDFN5x5
A
H
T1
C
d
D
W
E1
F
330.0±2.00
50 MIN.
12.4+2.00
-0.00
13.0+0.50
-0.20
1.5 MIN.
20.2 MIN.
12.0±0.30
1.75±0.10
5.5±0.10
P0
P1
P2
D0
D1
T
A0
B0
K0
4.0±0.10
8.0±0.10
2.0±0.10
1.5+0.10
-0.00
1.5 MIN.
0.6+0.00
-0.40
5.35±0.20
5.35±0.20
1.00±0.20
(mm)
Devices Per Unit
Package Type
Unit
Quantity
TDFN5x5-16
Tape & Reel
2500
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APW8739
Taping Direction Information
TDFN5x5-16
USER DIRECTION OF FEED
Classification Profile
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APW8739
Classification Reflow Profiles
Profile Feature
Sn-Pb Eutectic Assembly
Pb-Free Assembly
100 °C
150 °C
60-120 seconds
150 °C
200 °C
60-120 seconds
3 °C/second max.
3°C/second max.
183 °C
60-150 seconds
217 °C
60-150 seconds
See Classification Temp in table 1
See Classification Temp in table 2
Time (tP)** within 5°C of the specified
classification temperature (Tc)
20** seconds
30** seconds
Average ramp-down rate (Tp to Tsmax)
6 °C/second max.
6 °C/second max.
6 minutes max.
8 minutes max.
Preheat & Soak
Temperature min (Tsmin)
Temperature max (Tsmax)
Time (Tsmin to Tsmax) (ts)
Average ramp-up rate
(Tsmax to TP)
Liquidous temperature (TL)
Time at liquidous (tL)
Peak package body Temperature
(Tp)*
Time 25°C to peak temperature
* Tolerance for peak profile Temperature (Tp) is defined as a supplier minimum and a user maximum.
** Tolerance for time at peak profile temperature (tp) is defined as a supplier minimum and a user maximum.
Table 1. SnPb Eutectic Process – Classification Temperatures (Tc)
Package
Thickness
<2.5 mm
≥2.5 mm
Volume mm
<350
235 °C
220 °C
3
Volume mm
≥350
220 °C
220 °C
3
Table 2. Pb-free Process – Classification Temperatures (Tc)
Package
Thickness
<1.6 mm
1.6 mm – 2.5 mm
≥2.5 mm
Volume mm
<350
260 °C
260 °C
250 °C
3
Volume mm
350-2000
260 °C
250 °C
245 °C
3
Volume mm
>2000
260 °C
245 °C
245 °C
3
Reliability Test Program
Test item
SOLDERABILITY
HOLT
PCT
TCT
HBM
MM
Latch-Up
Method
JESD-22, B102
JESD-22, A108
JESD-22, A102
JESD-22, A104
MIL-STD-883-3015.7
JESD-22, A115
JESD 78
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Description
5 Sec, 245°C
1000 Hrs, Bias @ Tj=125°C
168 Hrs, 100%RH, 2atm, 121°C
500 Cycles, -65°C~150°C
VHBM≧2KV
VMM≧200V
10ms, 1tr≧100mA
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APW8739
Customer Service
Anpec Electronics Corp.
Head Office :
No.6, Dusing 1st Road, SBIP,
Hsin-Chu, Taiwan, R.O.C.
Tel : 886-3-5642000
Fax : 886-3-5642050
Taipei Branch :
2F, No. 11, Lane 218, Sec 2 Jhongsing Rd.,
Sindian City, Taipei County 23146, Taiwan
Tel : 886-2-2910-3838
Fax : 886-2-2917-3838
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