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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
General Description
Features
The AP3032 is an inductor-based DC/DC boost
converter designed to drive up to 4 rows of LEDs
with 7 series for each in parallel for backlight.
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A constant frequency 1MHz PWM control scheme is
employed in this IC, which means tiny external
components can be used. Specifically, 1mm tall
6.8μH inductor and 1µF aluminum output capacitor
for the typical application is sufficient.
The over output voltage protection is equipped in
AP3032, which protects the IC under open load
condition. The AP3032 includes UVLO, soft-start,
stand-by mode, current limiting and OTSD to protect
the circuit under over load condition
Efficiency Up to 81%（VIN=5V, IOUT=80mA）
Drives up to 4 Rows of WLEDs with 7 Series
for Each in Parallel (VIN=5V)
Fast 1 MHz Switching Frequency
Wide Input Voltage Range: 2.7V to 9V
Low Feedback Voltage: 200mV
Output Over Voltage Protection
Cycle-by-cycle Current Limit: 1.4A
Built in Soft-start
Built in Standby-mode to Achieve High
Frequency PWM Dimming
Built in Thermal Shutdown Function
Under Voltage Lockout
Applications
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The AP3032 is available in SOT-23-6 package.
7’ to 10’ LCD Panels
Digital Photo Frame
GPS Receiver
SOT-23-6
Figure 1. Package Type of AP3032
Dec. 2012
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Pin Configuration
K Package
(SOT-23-6)
Pin 1 Mark
SW
1
6
VIN
GND
2
5
OV
FB
3
4
CTRL
Figure 2. Pin Configuration of AP3032 (Top View)
Pin Description
Pin Number
Pin Name
1
SW
2
GND
3
FB
Dec. 2012
4
CTRL
5
OV
6
VIN
Function
Switch pin. Connect external inductor and Schottky
Ground
Voltage feedback. Reference voltage is 200mV
Enable and dimming control pin. Connect to a high input to enable
the IC or a low input to disable the IC. Connect to a PWM input to
achieve dimming control If logic low time is less than about 0.7
ms, AP3032 is hold on standby mode, at which it shut down the
power switch but shield the soft-start function, to achieve high
frequency dimming
Over voltage protection input. Connect to the output directly. On
OVP condition, the output voltage will clamp
Input supply pin. Must be locally bypassed
Rev. 1. 2
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Functional Block Diagram
FB
SW
3
1
SOFT
START
5
OVP
VIN
6
VREF
A1
1.25V
CONTROL
LOGIC
A2
COMPARATOR
Q1
OVER
TEMPERATURE
DETECTOR
2
CTRL
OV
DRIVER
200mV
GND
4
RAMP
GENERATOR
STAND BY
1.2MHz
OSCILLATOR
Figure 3. Functional Block Diagram of AP3032
Ordering Information
AP3032
-
Circuit Type
G1: Green
TR: Tape & Reel
Package
K: SOT-23-6
Package
Temperature
Range
SOT-23-6
-40 to 85°C
Part Number
AP3032KTR-G1
Marking ID
GJL
Packing Type
Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Dec. 2012
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
Input Voltage
VIN
20
V
SW Pin Voltage
VSW
38
V
FB Pin Voltage
VFB
20
V
OV Voltage
VOV
35
V
VCTRL
20
V
θJA
265
°C/W
TJ
150
°C
Storage Temperature Range
TSTG
-65 to 150
°C
Lead Temperature (Soldering, 10sec)
TLEAD
260
°C
ESD (Machine Model)
200
V
ESD (Human Body Model)
2000
V
CTRL Pin Voltage
Thermal Resistance (Junction
Ambient, No Heat Sink)
Operating Junction Temperature
to
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
Operating Temperature Range
TOP
-40
85
°C
Input Voltage
VIN
2.7
9
V
9
V
CTRL Pin Voltage
Dec. 2012
VCTRL
Rev. 1. 2
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Electrical Characteristics
VIN=VCTRL=5.0V, unless otherwise specified. Specification with standard typeface are for TA= 25°C, and those in
boldface type apply over the full operating temperature rang (TA=-40°C to 85°C).
Parameters
Symbol
Conditions
Min
Typ
Max
Unit
9
V
5.0
mA
SUPPLY VOLTAGE (VIN PIN)
Input Voltage
VIN
Quiescent Current
Shutdown Supply Current
IQ
ISHDN
2.7
VFB=VIN,
Not Switching
3.0
VCTRL=0V
4.0
50
μA
ENABLE (EN PIN)
CTRL Pin Voltage
VCTRL
1.2
V
CTRL Pin Bias Current
ICTRL
60
μA
VOVP
27
V
OUTPUT VOLTAGE
OVP Voltage
VOLTAGE REFERENCE (FB PIN)
Feedback Voltage
VFB
Feedback Bias Current
IFB
188
200
212
mV
35
100
μA
1.3
MHz
SWITCHING REGULATOR
Switching Frequency
f
0.75
1
Maximum Duty Cycle
DMAX
90
93
%
Switch Current Limit
ILIMIT
D=60%
1.2
1.4
A
VCE_SAT
ISW=1A
300
mV
VSW=9V
0.01
Switch VCE Saturation Voltage
Switch Leakage Current
5
μA
THERMAL SHUTDOWN
Thermal Shutdown
TOTSD
160
ºC
Thermal Shutdown Hysteresis
THYS
20
ºC
Soft-start Time
tSS
300
μs
Standby Time
tSTANDBY
0.7
ms
SOFT START
Dec. 2012
Rev. 1. 2
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Typical Performance Characteristics
The WLED forward voltage (VF) is 3.2V at ILED=20mA, unless otherwise noted.
100
1.8
90
1.7
80
1.6
Current Limit (A)
Efficiency (%)
70
60
50
40
30
O
1.4
1.3
1.2
TA=25 C
LED:7S4P,20mA Per Channel
20
1.5
o
TA=25 C
1.1
10
0
1.0
3
4
5
6
7
8
9
0
10
20
30
Figure 4. Efficiency vs. Input Voltage
50
60
70
80
90
Figure 5. Switch Current Limit vs. Duty Cycle
2.70
4.7
2.65
4.6
TA= -40 C
4.5
TA= 25 C
Quiescent Current (mA)
Minimum Operating Voltage (V)
40
Duty Cycle (%)
Input Voltage (V)
2.60
2.55
2.50
2.45
2.40
2.35
o
4.3
4.2
4.1
4.0
3.9
2.25
3.8
3.7
-40
-20
0
20
40
60
80
100
120
2
140
3
4
5
6
7
8
9
Input Voltage (V)
o
Temperature ( C)
Figure 6. Minimum Operating Voltage vs. Temperature
Dec. 2012
TA= 85 C
4.4
2.30
2.20
-60
o
o
Rev. 1. 2
Figure 7. Quiescent Current vs. Input Voltage
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Typical Performance Characteristics (Continued)
The WLED forward voltage (VF) is 3.2V at ILED=20mA, unless otherwise noted.
2.0
80
o
1.8
TA= -40 C
o
75
TA= 25 C
CTRL Pin Voltage (V)
Shutdown Quiescent Current (μA)
85
o
TA= 85 C
70
65
60
55
1.6
1.4
1.2
1.0
50
0.8
45
0.6
40
2
3
4
5
6
7
8
0.4
-60
9
-40
-20
0
40
60
80
100
120
140
Temperature ( C)
Figure 8. Shutdown Quiescent Current vs. Input Voltage
Figure 9. CTRL Pin Voltage vs. Temperature
220
212
200
210
208
180
Feedback Voltage (mV)
CTRL Pin Current (μA)
20
o
Input Voltage (V)
160
140
120
100
80
60
206
204
202
200
198
196
194
192
40
IOUT= 20mA
190
188
-60
20
2
3
4
5
6
7
8
9
-40
-20
0
20
40
60
80
100
120
140
o
Temperature ( C)
CTRL Pin Voltage (V)
Figure 10. CTRL Pin Current vs. CTRL Pin Voltage
Dec. 2012
Figure 11. Feedback Voltage vs. Temperature
Rev. 1. 2
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Typical Performance Characteristics (Continued)
The WLED forward voltage (VF) is 3.2V at ILED=20mA, unless otherwise noted.
30
1.4
1.3
28
OVP Voltage (V)
Frequency (MHz)
1.2
1.1
1.0
0.9
26
24
0.8
22
0.7
0.6
-60
20
-40
-20
0
20
40
60
80
100
120
140
-60
o
-40
-20
0
20
40
60
80
100
120
140
o
Temperature ( C)
Temperature ( C)
Figure 12. Frequency vs. Temperature
Figure 13. OVP Voltage vs. Temperature
100
90
o
Case Temperature ( C)
80
70
60
50
40
o
TA=25 C
7S4P,20mA Per Channel
30
20
3
4
5
6
7
8
9
Input Voltage (V)
Figure 14. Case Temperature vs. Input voltage
Dec. 2012
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Application Information
th
1. Operation
the inrush current during startup. If logic low time on
CTRL pin is more than about 0.7ms and then enable
the IC, the AP3032 will start smoothly to protect
system departments. The time of startup is controlled
by internal soft start capacitor. Details please refer to
Figure 15.
The AP3032 is a boost DC-DC converter which uses
a constant frequency, current mode control scheme to
provide excellent line and load regulation. Operation
can be best understood by referring to the Figure 21.
At the start of each oscillator cycle, switch Q1 turns
on. The switch current will increase linearly. The
voltage on sense resistor is proportional to the switch
current. The output of the current sense amplifier is
added to a stabilizing ramp and the result is fed into
the non-inversion input of the PWM comparator A2.
When this voltage exceeds the output voltage level of
the error amplifier A1, the switch is turned off.
It is clear that the voltage level at inversion input of
A2 sets the peak current level to keep the output in
regulation. This voltage level is the output signal of
error amplifier A1, and is the amplified signal of the
voltage difference between feedback voltage and
reference voltage of 200mV. So, a constant output
current can be provided by this operation mode.
Figure 15. Soft Start Waveform
2. LED Current Control
Refer to Figure 21, the LED current is controlled by
the feedback resistor RISET. LEDs' current accuracy is
determined by the regulator's feedback threshold
accuracy and is independent of the LED's forward
voltage variation. So the precise resistors are
preferred. The resistance of RISET is in inverse
proportion to the LED current since the feedback
reference is fixed at 200mV. The relation for RISET
and LED current (ILED) can be expressed as below:
RISET =
5. Standby and Dimming
To avoid audio noise and achieve high frequency
dimming, AP3032 setup a standby function. If logic
low time on CTRL pin is less than about 0.7ms and
then enable the IC, AP3032 will hold on standby
mode and start directly to achieve high frequency
dimming. Details please refer to Figure 16.
200mV
I LED
3. Over Voltage Protection
The AP3032 has an internal open-load protection
circuit. When the LEDs are disconnected from circuit
or fail open, the output voltage is clamped at 27V.
The AP3032 will switch at a low frequency, and
minimize current to avoid input voltage drop.
Figure 16. Standby Waveform
4. Soft Start
The AP3032 has an internal soft start circuit to limit
Dec. 2012
Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Application Information (Continued)
Two typical types of dimming control circuit are
present as below. First, controlling CTRL Pin voltage
to change operation state is a good choice. Second,
changing the feedback voltage to get appropriate duty
and luminous intensity is also useful.
5.2 Changing the Effective Feedback Voltage
There are two popular methods to change the
effective feedback voltage.
First, adding a constant DC voltage through a resistor
divider to FB pin can control the dimming. Changing
the DC voltage or resistor between the FB Pin and the
DC voltage can get appropriate luminous intensity.
Comparing with all kinds of PWM signal control, this
method features a stable output voltage and LEDs
current. Please refer to Figure 19.
5.1 Adding a Control Signal to CTRL Pin
Adding a PWM signal to CTRL pin directly, the
AP3032 is turned on and off by this signal. When the
PWM frequency is lower than 2.5kHz (Typ), the IC
works in the soft-start mode to dimming the light. But
we intense suggest set the PWM signal frequency
higher than 25kHz to avoid audio noise. In this
situation, IC works in the standby mode and start
directly to achieve dimming the light. More details
please refer to Figure 17 and Figure 18.
AP3032
CTRL
up to 25kHz
Figure 17. Dimming Control
Using a PWM Signal on CTRL Pin
Figure 19. Dimming Control
Using DC Voltage
Second, using a filtered PWM signal can do it. The
filtered PWM signal can be considered as a varying
and adjustable DC voltage. Please refer to Figure 20.
Figure 18. High Frequency
(25kHz) Dimming Waveform
Figure 20. Dimming Control
Using Filtered PWM Voltage
Dec. 2012 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Typical Application
Figure 21. Typical Application of AP3032 (7S4P)
Dec. 2012 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3032
Mechanical Dimensions
SOT-23-6
Unit: mm(inch)
0°
2.820(0.111)
8°
3.020(0.119)
0.300(0.012)
0.400(0.016)
5
4
2
3
0.300(0.012)
0.600(0.024)
1.500(0.059)
1.700(0.067)
2.650(0.104)
2.950(0.116)
6
0.200(0.008)
Pin 1 Mark
1
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
0.900(0.035) 1.450(0.057)
MAX
1.300(0.051)
Dec. 2012 Rev. 1. 2
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