BCD AP3068 White led driver for lcd panel backlight Datasheet

Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
General Description
Features
The AP3068 is a white LED (WLED) driver with
current balancing and dimming functions. It consists
of a boost controller and 8-channel current sinks to
drive WLED arrays with constant current from a
wide power supply range. It can be used in middle
and large-sized LCD panel backlight.
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The full-scale LED current can be adjusted from
5mA to 100mA simply via a resistor. The 8 channels
can be paralleled for higher current application. The
AP3068 can support direct PWM dimming.
The AP3068 features LED open/short protection,
Under Voltage Lockout (UVLO) protection, over
output voltage protection and Over Temperature
Protection (OTP).
AP3068
Input Voltage Range: 6V to 27V
Maximum Duty Cycle: 93%
Maximum Channel Current: 100mA
Current Matching Accuracy: ±1.5%
Adjustable Operating Frequency: 200kHz to
1MHz
Cycle-by-cycle Current Limit
Unused LED Channel Auto-detection
Open/Short LED Protection
Programmable Soft-start
Programmable UVLO Protection
Programmable OVP
Over Temperature Protection
FBX and SDBX Pins Enable Parallel
Application with AP3608E
Applications
The AP3068 is available in TSSOP-281(EDP)
package.
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LCD Monitor
LCD Display Module
LCD TV
TSSOP-28 (EDP)
Figure 1. Package Type of AP3068
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
1
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Pin Configuration
G Package
(TSSOP-28 (EDP))
Figure 2. Pin Configuration of AP3068 (Top View)
Pin Description
Pin Number
Pin Name
Function
1
PGND2
2,3,4,5,
25,26,27,28
CH1 to CH8
6
PWM
7
FBX
8
ISET
9
FB2
10
FB1
Power ground pin of current sink section
White LED cathode connection pin. The current of each channel
can be set from 5mA to 100mA. The channels can be paralleled
for higher current application. These pins should be connected to
GND if not used
PWM dimming control pin. Add a PWM signal to this pin to
realize PWM dimming control
This pin is an interface terminal. Connect it with current sink
device for parallel application. Leave it unconnected if not used
LED current setting pin. An external resistor can be connected to
this pin to set LED current, the full-scale current can be adjusted
from 5mA to100mA
Feedback pin. This pin is an interface terminal, which samples the
voltage of each channel, and outputs the lowest voltage to DC/DC
controller
Voltage feedback pin of the boost controller section. The reference
voltage is 500mV
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
2
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Pin Description (Continued)
Pin Number
Pin Name
Function
11
COMP
12
SS
13
UVLO
14
OV
15
EN
16
VIN
17
VCC
18
OUT
19
PGND1
20
RT
21
CS
22
AGND
23
SDBX
24
VDD
Boost controller compensation pin. This pin is the output of
internal error amplifier
Soft-start time control pin. An external soft-start time capacitor is
placed between this pin and AGND, and is charged by an internal
12µA current source to control the soft-start time of regulator
Under voltage lockout sense pin. The start-up and shutdown level
can be set via two resistors respectively connected from this pin
to AGND and VIN pin
Over voltage sense pin
Enable pin. Logic high enables the IC, while logic low disables
the IC
Input supply pin of boost controller section. This pin must be
locally bypassed. The input voltage ranges from 6V to 27V
6V linear regulator output pin. It is used to bias the gate driver for
external MOSFET. If VIN is less than 8.5V, VCC is equal to VIN
minus dropout voltage across the bypass switch (VDROP), in other
words, VCC=VIN-VDROP. This pin should be bypassed to GND
(recommended to be connected to AGND pin) with a ceramic
capacitor
External MOSFET gate driver output pin. The gate driver has
0.6A peak current capability
Power ground pin of the boost controller section
Frequency control pin. The operating frequency can be set via an
external resistor placed between this pin and AGND
Switch current sense pin. It is used for current mode control and
current limit
Analog ground pin
This pin is an interface terminal. Connect it with current sink
device for parallel application. It should be connected to GND if
not used
Input supply pin for current sink section. The input voltage ranges
from 4.2V to 5.5V
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
3
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3068
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
4
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Ordering Information
AP3068 A
A
-
Circuit Type
G1: Green
Package
G: TSSOP-28 (EDP) 5
TR: Tape & Reel
Package
Temperature
Range
TSSOP-28 (EDP)
-40 to 85°C
Part Number
AP3068GTR-G1
Marking ID
AP3068G-G1
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Voltage
VIN
30
V
CH1 to CH8 Voltage (Note 2)
VDX
-0.3 to 40
V
EN Pin Voltage
VEN
-0.3 to 30
V
VDD Pin Voltage
VDD
-0.3 to 6
V
ISET Pin Voltage
VISET
-0.3 to 6
V
PWM Pin Voltage
VPWM
-0.3 to 6
V
COMP Pin Voltage
VCOMP
-0.3 to 6
V
VSS
-0.3 to 6
V
UVLO Pin Voltage
VUVLO
-0.3 to 7
V
VCC Pin Voltage
VVCC
-0.3 to 10
V
OUT Pin Voltage
VOUT
-0.3 to 10
V
CS Pin Voltage
VCS
-0.3 to 7
V
RT Pin Voltage
VRT
-0.3 to 7
V
OV Pin Voltage
VOV
-0.3 to 7
V
SS Pin Voltage
Note 2: Breakdown Voltage
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
5
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Absolute Maximum Ratings (Note 1) (Continued)
Parameter
Symbol
Value
Unit
TJ
150
ºC
Storage Temperature
TSTG
-65 to 150
ºC
Lead Temperature (Soldering, 10 sec)
TLEAD
260
ºC
ESD (Machine Model)
200
V
ESD (Human Body Model)
2000
V
Operating Junction Temperature
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Min
Max
Unit
Input Voltage 1
VIN
6
27
V
Input Voltage 2
VDD
4.2
5.5
V
Operating Frequency
fO
0.2
1
MHz
LED Channel Current
ICHX
5
100
mA
PWM Dimming Frequency
fPWM
0.1
25
kHz
TA
-40
85
ºC
Operating Temperature
Electrical Characteristics
VIN =12V, VDD=5V, TA=25°C, unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
27
V
INPUT SECTION
Input Voltage
Quiescent Current
Shutdown Supply Current
May. 2010
VIN
6
IQ
No Switching
3
5
mA
ISHTD
VEN =VDD=0V
1
2
µA
Rev. 1.3
BCD Semiconductor Manufacturing Limited
6
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Electrical Characteristics (Continued)
VIN =12V, VDD=5V, TA=25°C, unless otherwise specified.
Parameter
Symbol
VIN UVLO Threshold
VUVLO
VIN UVLO Hysteresis Current
Source
Conditions
Rising Edge
IHYS
Min
Typ
Max
Unit
1.22
1.25
1.28
V
16
20
24
µA
VCC SECTION
VCC Voltage
VCC
VCC Current Limit
6V≤VIN≤9V
5
9V≤VIN≤27V
5.5
IVCC_LIM
ICC=0mA,
fOSC≤400kHz,
V
6
6.5
V
50
mA
300
mV
Dropout Voltage Across Bypass
Switch
VDROP
Bypass Switch Turn-off Threshold
VBYP_HI
VIN Rising
8.7
V
Bypass Switch Threshold Hysteresis
VBYP_HYS
VIN Falling
260
mV
VCC UVLO Threshold
VCC_UVLO
Rising Edge
4.7
V
VCC UVLO Hysteresis
VCC_HYS
300
mV
6V≤VIN≤8.5V
BOOST CONTROLLER SECTION
RT Voltage
VRT
1.20
V
1
MHz
fO
Error Amplifier Transconductance
gM
470
µA/V
Error Amplifier Output Resistance
RO
1
Ω
Current Limit Threshold Voltage
VCS
0.09
0.11
DMAX
90
93
%
12
µA
Soft-start Current Source
0.2
1.30
Operating Frequency
Maximum Duty Cycle
Adjustable
1.25
ISS
0.13
V
OUT Pin Rising Time
tRISING
1nF Load
20
ns
OUT Pin Falling Time
tFALLING
1nF Load
20
ns
VOUT_H
IOUT=50mA
0.25
0.75
V
VOUT_L
IOUT =100mA
0.25
0.75
V
Output
High
(VCC-VOUT)
Voltage
Output Low Voltage Level
OV Threshold
OV Hysteresis Current Source
May. 2010
Level
VOV
1.25
IOV_HYS
16
Rev. 1.3
20
V
24
µA
BCD Semiconductor Manufacturing Limited
7
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Electrical Characteristics (Continued)
VIN =12V, VDD=5V, TA=25°C, unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
5.5
V
0.5
1
mA
V
CURRENT SINK SECTION
Input Voltage
VDD
Quiescent Current
IQ
ISET Reference Voltage
Output/ISET Current Multiplication
Ratio
Maximum
Channel
Output
4.2
Current
Current
Matching
Between Each Channel
per
Accuracy
Current Sink Saturation Voltage per
Channel
Output Current Line Regulation
No Load
VISET
1.17
1.194
1.218
k
370
400
430
VCHX=0.5V
23
45
VCHX=1V
65
70
VCHX=1.5V
110
120
ICHX=60mA
VCHX=1V
-1.5
ICHX-MAX
ICH-MATCH
VCHX
∆ICH/
(ICH×∆VDD)
LED Open Detecting Voltage
1.5
ICHX=20mA
0.45
ICHX=60mA
0.8
ICHX=100mA
1.2
VDD=4.2V
5.5V
to
VCHX=0.5V to
2.8V
Output Current Load Regulation
mA
VD_OPEN
%
V
2
%/V
4
%
3
V
ENABLE AND PWM DIMMING SECTION
EN High Level Threshold Voltage
VIH_EN
EN Low Level Threshold Voltage
VIL_EN
PWM High
Voltage
PWM Low
Voltage
Level
Threshold
Level
Threshold
2.0
V
0.5
VIH_PWM
1.8
V
VIL_PWM
PWM Dimming Frequency
fPWM
0.1
Minimum PWM Duty Cycle
DPWM_MIN
0.35
V
0.8
V
25
kHz
%
TOTAL DEVICE
Thermal Shutdown Temperature
TOTSD
160
ºC
Thermal Shutdown Hysteresis
THYS
20
ºC
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
8
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Typical Performance Characteristics
VIN =12V, VEN=VDD=5V, RIEST=20kΩ, TA=25°C, unless otherwise specified.
140
6.5
6.3
100
6.2
VCC Voltage (V)
Maximum Output Current (mA)
6.4
120
80
60
40
6.1
6.0
5.9
O
-50 C
O
25 C
O
85 C
O
125 C
5.8
5.7
20
5.6
0
0.4
0.6
0.8
1.0
1.2
1.4
5.5
1.6
6
9
12
Voltage per Channel (V)
1.30
1100
1.29
1000
24
27
1.28
900
1.27
RT Voltage (V)
Frequency (kHz)
21
Figure 5. VCC Voltage vs. Input Voltage
1200
800
700
600
500
1.26
1.25
1.24
O
400
1.23
300
1.22
200
1.21
80
120
160
200
240
280
320
360
-50 C
O
25 C
O
85 C
O
125 C
1.20
400
5
RT (kΩ)
10
15
20
25
30
Input Voltage (V)
Figure 7. RT Voltage vs. Input Voltage
Figure 6. Frequency vs. RT
May. 2010
18
Input Voltage (V)
Figure 4. Maximum Output Current vs.
Voltage per Channel
100
40
15
Rev. 1.3
BCD Semiconductor Manufacturing Limited
9
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Application Information
1. Input Under-voltage Detector
Where VOVP is the OVP voltage and VOVP_HYSTERESIS
is the OVP hysteresis voltage.
The AP3068 integrates an UVLO circuit. Two
resistors RUV1 and RUV2 are respectively connected
from UVLO pin to GND and VIN pin (Figure 9). The
resistor divider (RUV1 and RUV2) must be designed
such that the voltage on UVLO pin is higher than
1.25V when VIN is in the desired operating range. If
the voltage on UVLO pin is below the under voltage
threshold, all functions of AP3068 will be disabled,
while the system will remain in a low-power standby
state. The UVLO hysteresis is realized through an
internal 22µA current source, which switched on or
off 22µA current flowed into the set-point divider.
The current source will be instantly activated to raise
the voltage on the UVLO pin (VUVLO) when the
UVLO threshold (TUVLO) is exceeded, and will be
turned off to lower VUVLO when VUVLO falls below
TUVLO. The formulas of UVLO can be expressed as
blow:
VIN_THRESHOLD =
3. Frequency Selection
An external resistor RT, placed between RT pin and
GND, can be used to set the operating frequency
(Figure 9). The operating frequency ranges from
200kHz to 1MHz (Table 1). The high frequency
operation optimizes the regulator for the smallestsized component application, while low frequency
operation can help to reduce switch loss.
RT (kΩ)
390
147
95
68
51
(R UV1 + R UV2 ) × 1.25V
R UV2
Table 1. Frequency Selection
4. Soft-start
VIN_HYSTERESIS = R UV1 × 22 µA
The AP3068 integrates a soft-start circuit to limit the
inrush current during start-up. The time of soft-start
can be controlled by an internal 12µA current source
and an external soft-start capacitor CSS placed
between SS pin and GND (Figure 9). The effective
CSS voltage for soft-start ranges from 0V to 2.3V, and
the time of soft-start can be expressed as below:
Where VIN_THRESHOLD is the input threshold voltage
and VIN_HYSTERESIS is the input hysteresis voltage.
2. Over Voltage Protection
The AP3068 integrates an OVP circuit. The OV pin is
connected to the center tap of voltage-divider (ROV1
and ROV2) that placed between high voltage output
and GND (Figure 9). If the voltage on OV pin
exceeds 1.25V, which may results from open loop or
excessive output voltage, all the functions of AP3068
will be disabled with output voltage falling. The OVP
hysteresis is realized by an internal 22µA current
source and its operation mode behaves the same as
UVLO. The formulas of OVP can be expressed as
blow:
VOVP =
t SS =
C SS × 2.3V
12µA
Where tSS is the time of soft-start.
5. VCC Pin Application Description
The AP3068 includes an internal low-dropout linear
regulator with an output pin VCC. This pin is used to
power the internal PWM controller, control logic and
MOSFET driver. On condition that VIN≥8.5V, the
regulator will generate a 6V supply; On condition
that 6V≤VIN ≤8.5V, VCC is equal to VIN minus
dropout voltage across bypass switch (VDROP), in
other words, VCC=VIN-VDROP; On condition that VIN
≤6V, connect VCC pin to VIN pin directly.
(R OV1 + R OV2 ) × 1.25V
R OV2
VOVP_HYSTERESIS = R OV1 × 22µA
May. 2010
Operating
Frequency (kHz)
200
400
600
800
1000
Rev. 1.3
BCD Semiconductor Manufacturing Limited
10
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Application Information (Continued)
6. LED Current Setting
The LED current can be reduced from 100% by
PWM dimming control.
The maximum LED current per channel can be
adjusted up to 100mA via ISET pin. When ≥100mA
current is needed in application, two or more
channels can be paralleled to provide larger drive
current (Figure 10). Connect a resistor RISET between
ISET pin and GND to set the reference current ISET,
and ISET can be expressed as below:
I SET =
7. PWM Dimming Mode
Applying a PWM signal to PWM pin to adjust the
LED current, that means, the LED current of all
enabled channels can be adjusted at the same time
and the LED brightness can be adjusted from 1%×
ICHX_MAX to 100% × ICHX_MAX. During the “high
level” period of PWM signal, the LED is turned on
and 100% of the current flows through LED, while
during the “low level” period of the PWM signal, the
LED is turned off and almost no current flows
through the LED, thus changing the average current
through LED and finally adjusting LED brightness.
The external PWM signal frequency applied to PWM
pin is allowed to be 100Hz or higher.
1.194V
R ISET
This reference current is multiplied internally with a
gain (k) of 400, and then be mirrored onto all enabled
channels, which can set the maximum LED current,
referred to as 100% current (ICHX_MAX). And ICHX_MAX
can be expressed as below:
I CHX_MAX = k × I SET
Figure 8. PWM Dimming of AP3068 (Example)
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
11
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Typical Application
VIN=6V to 27V
CIN
L
RUV1
VIN
UVLO
D
VOUT
COUT
OUT
ROV1
CS
RUV2
ROV2
ON OFF
EN
CSS
SS
RT
COMP
RT
Adjustable
PGND1(2)
RCOMP
OV
CH1
CH2
CH8
VCC
Dimming
Signal
PWM
CVCC
ISET
RISET
FB2
VDD
RFB1
FB1
RFB2
SDBX
VDD=4.2V to 5.5V
CVDD
AGND
Figure 9. Typical Application Circuit of AP3068 (Single Channel Application)
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
12
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Typical Application (Continued)
VIN=6V to 27V
CIN
L
RUV1
VIN
UVLO
D
VOUT
COUT
OUT
ROV1
CS
RUV2
ROV2
ON OFF
EN
CSS
SS
RT
COMP
RT
RCOMP
VCC
CVCC
OV
CH1
CH2
CH3
CH4
CH8
PWM
ISET
FB2
Dimming
Signal
RISET
RFB1
VDD=4.2V to 5.5V
VDD
FB1
RFB2
Adjustable
PGND1(2)
AGND
SDBX
CVDD
Figure 10. Typical Application Circuit of AP3068 (Paralleled Channel Application)
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
13
Preliminary Datasheet
WHITE LED DRIVER FOR LCD PANEL BACKLIGHT
AP3068
Mechanical Dimensions
TSSOP-28 (EDP)
Unit: mm(inch)
9.600(0.378)
9.800(0.386)
6.250(0.246)
6.550(0.258)
BASE PLANE
GAUGE LINE 0.250(0.010)
PIN #1 ID.
4.300(0.169)
4.500(0.177)
0.800(0.032)
1.050(0.041)
1.200(0.047)MAX
0°
8°
0.650(0.026) BSC
0.190(0.007)
0.300(0.012)
0.050(0.002)
0.150(0.006)
EXPOSED PAD
0.450(0.018)
0.750(0.030) 0.090(0.004)
0.200(0.008)
SEATING PLANE
2.740(0.108)
3.050(0.120)
5.640(0.222)
5.940(0.234)
Note: Eject hole, oriented hole and mold mark is optional.
May. 2010
Rev. 1.3
BCD Semiconductor Manufacturing Limited
14
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Jiu-Zong
Rd.,Shanghai
Nei-Hu
Taipei(114),
Taiwan, R.O.C
800,+86-21-24162266,
YiRoom
Shan Road,
Shanghai
200233,
ChinaAve.1.S., Nanshan District
8F,
Zone
B, 900,
YiFax:
Shan+86-21-5450
Road,
200233,
China
Shenzhen
518057,1491,
ChinaFax: +86-21-5450 0008
Tel: +886-2-2656
2808
Tel: +86-21-6485
Tel: +86-21-6495
9539, Fax: +86-21-6485 9673
REGIONAL
SALES OFFICE
Tel: +86-0755-8660-4900,
Fax: +86-0755-8660-4958
Fax: +886-2-2656-2806/26562950
Shenzhen OfficeSALES OFFICE
Taiwan Office
USA Office
REGIONAL
Shanghai
SIM-BCD
Semiconductor Manufacturing Co., Ltd., Shenzhen Office
Semiconductor
BCD Office
Semiconductor Corp.
Taiwan
Office
(Hsinchu)
USABCD
Office
Korea Office USA
Shenzhen
Office
Taiwan
Office (Taiwan) Company Limited
Unit
ASemiconductor
Room
1203, Skyworth
Gaoxin
Ave.1.S., Nanshan
Shenzhen,
4F,Semiconductor
298-1,
Guang
Road,(Taiwan)
Nei-Hu District,
Taipei,
30920Semiconductor
Huntwood
Ave.Corporation
Hayward,
BCD
(Taiwan)Bldg.,
Company
Limited
BCD
Corp.
BCD
Semiconductor
Limited Korea
office.
Shanghai
SIM-BCD
Semiconductor
Manufacturing
Co., Ltd.District,
Shenzhen
Office
BCDRui
Semiconductor
Company
Limited
BCD
China
Taiwan
CADigital-Empire
94544,
USA Ave.
8F,
No.176,Analog
Sec. 2, Gong-Dao
5th Road, Corporation
East District Shenzhen Office
48460
Kato
CARoad,
94538,
USA District,
Room
101-1112,
II, 486
Sin-dong,
Advanced
Circuits (Shanghai)
4F,Road,
298-1,Fremont,
Rui Guang
Nei-Hu
Taipei,
30920
Huntwood
Hayward,
Tel:
+86-755-8826
7951
+886-2-2656
2808
Tel
:94544,
+1-510-324-2988
HsinChu
300, Taiwan,
R.O.C 3rd Fuzhong Road, Futian District, Shenzhen 518026, China
Tel:Tel:
+1-510-668-1950
Yeongtong-Gu,
Suwon-city,
Gyeonggi-do, Korea
Room
E, City
5F, Noble
Center, No.1006,
Taiwan
CA
U.S.A
Fax:
+86-755-8826
7865
Fax:
+886-2-2656
2806
Fax:
+1-510-324-2788
Tel:
+886-3-5160181,
Fax:
+886-3-5160181
Fax:
+1-510-668-1990
Tel:
+82-31-695-8430
Tel: +86-755-8826 7951
Tel: +886-2-2656 2808
Tel : +1-510-324-2988
Fax: +86-755-8826 7865
Fax: +886-2-2656 2806
Fax: +1-510-324-2788