Diodes AP3033 User Manual

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

General Description

The AP3033 is an inductor-based DC/DC boost con­verter designed to drive LED arrays. 1.3A switching
current allows AP3033 to be used in different 7' to 10'
LCD panel backlights (3S8P LED arrays typically).

A constant frequency 1MHz PWM control scheme is
employed in this IC, which means tiny external com­ponents can be used. Specifically, 1mm tall 10
inductor and 10
application is sufficient.

The over output voltage protection is equipped in
AP3033, which protects the IC under open load condi­tion. The AP3033 includes UVLO, soft-start, standby
mode, current limit and OTSD to protect the circuit.

The AP3033 is available in standard TSOT-23-6 pack­age.

µF output capacitor for the typical

µH

Features

· Up to 92% Efficiency

(V

· Up to 88% Efficiency

(V

· Fast 1MHz Switching Frequency

· Wide Input Voltage Range: 3V to 16V

· Low 200mV Feedback Voltage

· Output Over Voltage Protection

· Cycle by Cycle Current Limit: 1.3A

· High Frequency PWM Dimming

· Built-in Soft-start

· Built-in Thermal Shutdown Function

· Under Voltage Lockout

=9V, I

IN

=5V, I

IN

OUT

OUT

=160mA)

=160mA)

Applications

· 7' to 10' LCD Panels

· Digital Photo Frame

· GPS Receiver

· Netbook

· PDVD

TSOT-23-6

Figure 1. Package Type of AP3033

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Pin Configuration

KT Package

(TSOT-23-6)

Pin 1 Dot by Marking

V

SW

GND

1

2

6

IN

OV

5

FB

34

CTRL

Figure 2. Pin Configuration of AP3033 (Top View)

Pin Description

Pin Number Pin Name Function

1 SW Switch Pin. Connect external inductor and Schottky

2 GND Ground Pin

3 FB Voltage Feedback Pin. 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. If logic low time is more than about 0.45ms and then enable the IC, the

4

5 OV Over-voltage Protection Input Pin. Connect to the output directly or connect to the V

CTRL

AP3033 will soft start to protect system departments. If logic low time is less than about

0.45ms and then enable the IC, the AP3033 will hold on standby mode and start directly to
achieve high frequency dimming

through a resistor divider to set the OVP voltage. On OVP condition, the output voltage will
be clamped

OUT

6V

Input Supply Pin. Must be locally bypassed

IN

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Functional Block Diagram

CTRL

FB

3

FB REF

R

C

200mV REF

4

STANDBY

V

REF

1.25V

V

6

IN

SOFT

START

OVP

A

1

A2

COMPARATOR

CONTROL

LOGIC

OVER

TEMPERATURE

DETECTOR

DRIVER

Σ

RAMP

GENERATOR

1MHz

OSCILLATOR

SW

1

5

OV

Q1

2

GND

Figure 3. Functional Block Diagram of AP3033

Ordering Information

AP3033 -

Circuit Type

Package

KT: TSOT-23-6

Package Temperature Range Part Number Marking ID Packing Type

TSOT-23-6

-40 to 85oC

AP3033KTTR-G1

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green.

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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G1: Green

TR: Tape and Reel

L8G

Tape & Reel

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage V

SW Voltage V

FB Voltage V

OV Voltage V

CTRL Voltage V

Thermal Resistance

IN

SW

FB

OV

CTRL

θ

JA

20 V

38 V

20 V

20 V

20 V

265

o

C/W

(Junction to Ambient, No Heat Sink)

Operating Junction Temperature T

Storage Temperature Range T

Lead Temperature (Soldering, 10sec) T

LEAD

J

STG

150

-65 to 150

260

o

C

o

C

o

C

ESD (Machine Model) 600 V

ESD (Human Body Model) 4000 V

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

Input Voltage V

CTRL Voltage V

IN

CTRL

3 16

16 V

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

4

o

C

V

Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Electrical Characteristics

(VIN=5.0V, V

=5.0V, TA=25oC, unless otherwise specified.)

CTRL

Parameter Symbol Conditions Min Typ Max Unit

Operating Voltage V

Quiescent Current I

Shutdown Quiescent Current I

Feedback Voltage (Note 2)

FB Pin Bias Current I

IN

Q

SHDN

V

FB

FB

VFB=VIN, no switching 4.0 5.0 6.0 mA

V

=0V 50 µA

CTRL

I

=20mA, 3 LEDs,

OUT

=-40oC to 85oC

T

A

3.0 16

188 200 212 mV

35 100 nA

Switching Frequency f 0.75 1 1.3 MHz

Maximum Duty Cycle D

Switch Current Limit I

Switch V

Saturation Voltage V

CE

MAX

LIMIT

CESATISW

Switch Leakage Current V

CTRL Pin Voltage V

CTRL Pin Bias Current I

OVP Voltage V

Soft-start Time t

Standby Time t

Thermal Shutdown T

CTRL

CTRL

OVP

SS

STB

OTSD

D=60% 1.2 1.3 A

=0.6A 350 mV

=38V 0.01 5 µA

SW

90 93 %

1.2 V

60 µA

17 V

80 µs

0.45 ms

150

V

o

C

Note 2: The bold type specifications of full temperature range are guaranteed by design (GBD).

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Typical Performance Characteristics

(WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.)

100

80

60

40

Efficiency (%)

20

0

0 50 100 150 200 250 300

VIN=5V,V

µH,T

L=10

Output Current (mA)

Figure 4. Efficiency vs. Output Current

2.6

2.5

2.4

2.3

2.2

2.1

Minimum Operating Voltage (V)

2.0

-40-200 20406080100120

Case Temperature (0C)

OUT

=10V

=250C

A

100

80

60

40

Efficiency (%)

20

V

OUT

=10V, I

=160mA,

OUT

L=10µH, TA=250C

0

456789

Input Voltage (V)

Figure 5. Efficiency vs. Input Voltage

7.0

6.5

6.0

5.5

5.0

4.5

4.0

Quiescent Current (mA)

3.5

3.0
246810121416

VFB=VIN, TA=250C

Input Voltage (V)

Figure 6. Minimum Operating Voltage vs.

CaseTemperature

Figure 7. Quiescent Current vs. Input Voltage

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Typical Performance Characteristics (Continued)

(WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.)

220

210

200

190

180

170

Feedback Voltage (V)

160

150

-40 -20 0 20 40 60 80 100 120

Case Temperature (0C)

Figure 8. Feedback Voltage vs. Case Temperature

1.8

1.5

1.2

1000

900

800

700

600

500

400

300

Saturation Voltage (mV)

200

100

0.2 0.4 0.6 0.8 1.0

TC=-400C

TC=250C

TC=850C

Switch Current (A)

Figure 9. Saturation Voltage vs. Switch Current

20

19

18

17

0.9

Frequency (MHz)

0.6

0.3

0.0

-40-200 20406080100120

Case Temperature (0C)

Figure 10. Frequency vs. Case Temperature

16

15

OVP Voltage (V)

14

13

12

-40-200 20406080100120

Case Temperature (0C)

Figure 11.

OVP Voltage vs. Case Temperature

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Typical Performance Characteristics (Continued)

(WLED forward voltage (VF)=3.2V at IF=20mA, unless otherwise noted.)

1.8

1.6

1.4

1.2

1.0

0.8

0.6

Current Limit (A)

0.4

0.2

0.0
10 20 30 40 50 60 70 80 90

Duty Cycle (%)

Figure 12. Current Limit vs. Duty Cycle

TC=-400C

TC=250C

TC=850C

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Preliminary Datasheet

×

WHITE LED STEP-UP CONVERTER AP3033

Application Information

Operation

The AP3033 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 Figure 3 and
Figure 17.

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 non­inversion 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.

LED Current Control

Refer to Figure 17, the LED current is controlled by the
feedback resistor R

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 R

LED current since the feedback reference is fixed at
200mV. The relation for R

(I

)can be expressed as below:

LED

mV

ISET

200

=

I

LED

R

Over Voltage Protection

The AP3033 has an internal open load protection
circuit. When the LEDs are disconnected from circuit
or fail open, the output voltage is clamped at about
17V. The AP3033 will switch at a low frequency, and
minimize current to avoid input voltage drop.

. LEDs' current accuracy is

ISET

is in inverse proportion to the

ISET

and LED current

ISET

Soft Start

The AP3033 has an internal soft start circuit to limit
the inrush current during startup. If logic low time on
CTRL pin is more than about 0.45ms and then enable
the IC, the AP3033 will start smoothly to protect sys­tem departments. The time of startup is controlled by
internal soft-start capacitor. Details please refer to
Figure 13.

V

CTRL

2V/div
V

SW

5V/div

V

O

5V/div

I

L

500mA/div

Figure 13. Soft-start Waveform

V

=5V, 3×8 LEDs, I

IN

Time 80µs/div

LED

=160mA

Dimming Control

For controlling LED brightness, the AP3033 provides
typically 200mV feedback voltage when the CTRL pin
is pulled constantly high. However, CTRL pin allows a
PWM signal to reduce this regulation voltage by
changing the PWM duty cycle to achieve LED
brightness dimming control. Detail circuit, as show in
Figure 14. The relationship between the duty cycle and
LED current can be expressed as below:

200

=

I

LED

where D

PWM

200mV is internal reference voltage.

200mV

Ctrl

Figure 14. Bolck Diagram of Programmable

FB Voltage Using PWM Signal

DmV

PWM

R

ISET

is the duty cycle of PWM signal and

A

FB

EA

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Application Information (Continued)

Two other typical types of dimming control circuit are
presented as below.

(1) Using DC Voltage to Change the Effective Feed­back Voltage

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 15.

AP3033

FB

V

DC

R2R3

Figure 15. Dimming Control
Using DC Voltage

Effective

Feedback Voltage

R1

(2) Using Filtered PWM Signal to Change the Effec­tive Feedback Voltage

The filtered PWM signal can be considered as a
varying and adjustable DC voltage, please refer to Fig­ure 16.

AP3033

FB

PWM

R4

R3

C

R2

Figure 16. Dimming Control
Using Filtered PWM

Voltage

Effective

Feedback Voltage

R1

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Typical Application

V

IN

5V

L10µH

D

V

OUT

C

IN

10 µF

On/Off

V

IN

AP3033

CTRL

Figure 17. Typical Application of AP3033 (3S8P WLEDs)

GND

SW

OV

FB

C

OUT

µ

10 F

R

3S8P

ISET

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

WHITE LED STEP-UP CONVERTER AP3033

Mechanical Dimensions

TSOT-23-6 Unit: mm(inch)

°

2.800(0.110)

3.000(0.118)

R0.100(0.004)

MIN

0
8

°

1.500(0.059)

1.700(0.067)

0.000(0.000)

0.100(0.004)

0.950(0.037)

BSC

0.700(0.028)

0.900(0.035)

Pin 1 Dot by

Marking

1.900(0.075)

BSC

0.350(0.014)

0.510(0.020)

2.600(0.102)

3.000(0.118)

1.000(0.039)
MAX

GAUGE

PLANE

0.370(0.015)

MIN

0.100(0.004)

0.250(0.010)

0.250(0.010)

BSC

Jan. 2010 Rev. 1. 0 BCD Semiconductor Manufacturing Limited

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particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

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