AP8802HSP-13_技术文档

AP8802H

60V 1A LED Step-down Converter

Description

Pin Assignments

The AP8802H is a step-down DC/DC converter designed to

drive LEDs with a constant current. The device can drive up

to thirteen LEDs, depending on the forward voltage of the

LEDs, in series from a voltage source of 8V to 60V. Series

connection of the LEDs provides identical LED currents

resulting in uniform brightness and eliminating the need for

ballast resistors. The AP8802H switches at frequency up to

500kHz. This allows the use of small size external

components, hence minimizing the PCB area needed.

(Top View)

SET 1

8

7

6

5

CTRL

GND

SW

2

GND

NC 3

V_IN

AP8802H

4

SW

SO-8-EP

Maximum output current of AP8802H is set via an external

resistor connected between the V_INand SET input pins.

Dimming is achieved by applying either a DC voltage or a

PWM signal at the CTRL input pin. An input voltage of 0.2V

or lower at CTRL shuts down the output at SW and puts the

device into a low-current standby state.

Applications

•

Commercial & industrial lighting

Small LCD panel backlight

Appliances interior lighting

Architecture Detail lighting

Features

•

LED driving current up to 1A

High efficiency up to 92%

Operating input voltage up to 60V

5% nominal accuracy

High switching frequency up to 500kHz

PWM/DC input for dimming control

Built-in output open-circuit protection

SO-8-EP is available in “Green” Molding Compound

(No Br, Sb)

•

Lead Free Finish/ RoHS Compliant (Note 1)

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Typical Application Circuit

48V

V_IN

CTRL

R_SET= 0.2 ohm

SET

1

D₁

AP8802H

C₁= 2.2µF

L₁= 100µH

GND

SW

Pin Descriptions

Pin Name

Description

Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to

reduce EMI.

SW

GND

SET

GND pin

Set Nominal Output Current Pin. Configure the output current of the device.

Dimming and On/Off Control Input. Input voltage of 0.2V or lower forces the device into low

current standby mode and shuts off the output. A PWM signal allows the output current to be

adjusted above or below the level set by the resistor connected to SET input pin.

CTRL

The input impedance is about 50kΩ, and if the pin is left open V_CTRL= V_REF

Input Supply Pin. Must be locally bypassed.

No connection

V_IN

NC

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Functional Block Diagram

SET

SW

V

IN

Sensing

Block

Voltage

Regulator

5V

PWM/DC

Control

CTRL

GND

R

V_REF1.25V

AP8802H

Figure 2: AP8802H Block Diagram

Absolute Maximum Ratings

Symbol

Parameter

Rating

-0.3~60

150

Unit

V

V_IN

V_SW

T_J

VIN pin Voltage

SW Voltage

V

Junction Temperature

°C

T_LEAD

T_ST

Lead Temperature Soldering

Storage Temperature Range

300

-65 to +150

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be

exceeded under any condition.

Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when

handling and transporting these devices.

Recommended Operating Conditions (Note 2)

Symbol

Parameter

Ambient Temperature Range

Min

-40

0.1

Max

105

Unit

T_A

ºC

Duty Cycle Using Inductor ≥ 100µH (Note 2)

0.95

Notes:

2. For most applications the LED current will be within 5% over the duty cycle range specified. Duty cycle accuracy is also dependent on

propagationdelay. Smaller size inductors can be used but LED current accuracy may be greater than 5% at extremes of duty cycle. This is most

noticeable at low duty cycles (less than 0.1) or when the input voltage is high and only one LED is being driven.

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Electrical Characteristics (V_IN=12V, T_A=25^oC, unless otherwise specified)

Symbol

V_IN

Parameter

Conditions

Min

Typ.

Max Unit

Operating Input Voltage

Continuous switch current

Quiescent Current

8.0

-

60

1

V

A

I_OUT

(Note 3)

I_Q

-

75

120

0.5

210

-

μA

MHz

mV

V

F_OSC

V_THD

V_REF

SET

Rds(on)

Switching Frequency

-

Internal Threshold Voltage

Internal Reference Voltage

SET pin input current

190

200

-

1.25

V_SET= V_IN-0.2

I_SW= 0.8A

5

-

μA

Ω

On Resistance of MOSFET

0.65

1.1

8

I_{SW_Leakage}Switch leakage current

-

1.25

-

μA

V

EN

Voltage High

Voltage Low

ON

-

OFF

0.2

V

Thermal Resistance Junction-

to-Ambient

SO-8-EP (Note 4)

-

45

7

-

θ_JA

θ_JC

°C/W

Thermal Resistance Junction-

to-Case

Notes:

3. Refer to figure 8 for the device derating curve.

4. Test condition for SO-8-EP: Device mounted on FR-4 PCB, 2”x2”, 2oz copper, minimum recommended pad layout on top layer and thermal vias to

bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Applications Information

LED Current Control

The LED current is controlled by the resistor RSET in Figure 1 connected between V_INand SET. The nominal

average output current in the LED(s) is defined as:

V

THD

I

=

LED

R

SET

If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is:

V

CTRL THD

I

=

LED

V

R

REF

SET

LED current Versus RSET and VCTRL

1200

1000

800

600

400

200

0

0.39

0.2

LED current @

VCTRL = 1.25V

0.47

0.56

LED current @

VCTRL = 2.5V

0.33

0.39

0.47

0.56

0.68

0.82

LED current @

VCTRL = 0.625V

1

1.2

1.5

0.68

0.33

0.82

1

2

0.47

1.2

1.5

2

0.68

3

1.2

1.5

2

0

0.15 0.3 0.45 0.6 0.75 0.9 1.05 1.2 1.35 1.5 1.65 1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85

3

RSET value [Ohms]

Figure 3: LED Current setting Vs R_SETand V_CTRL

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Applications Information (Continued)

Inductor Selection

This section highlights how to select the inductor suitable for the application requirements in terms of switching

frequency, LED current accuracy and temperature.

Switching Frequency @ILED = 700mA

500

68

450

400

100

47

350

300

250

200

150

100

50

12V - 3 LEDs

24V - 5 LEDs

48V - 10 LEDs

68

150

100

220

150

47

470

220

470

0

50

100

150

200

250

300

350

400

450

500

Inductor Value [uH]

Figure 4: Switching Frequency Vs Inductor Value

The inductor influences the LED current accuracy that the system is able to provide. The following section

highlights how to select the inductor in relation to the device packages and the LED current, while maintaining the

chip temperature below 70˚C.

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Applications Information (Continued)

AP8802H SO-8-EP Minimum Recommended Inductor

15

14

13

12

11

10

9

Legend

47µH

5% Accuracy,

T_C< 70°C

I_LED~ 1A

68µH

100µH

150µH

8

7

6

150µH

5

68µH

100µH

4

47µH

3

2

1

0

10

20

30

40

50

60

Supply Voltage (V)

Figure 5: SO-8-EP recommended inductor with 1A LED current

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Applications Information (Continued)

Capacitor Selection

The small size of ceramic capacitors makes them ideal for AP8802H applications. X5R and X7R types are

recommended because they retain their capacitance over wider voltage and temperature ranges than other types

such as Z5U. A 2.2μF input capacitor is sufficient for most intended applications of AP8802H.

A 4.7μF input capacitor is suggested for application with an input voltage equal or higher than 60V.

Diode Selection

Schottky diodes, e.g. B2100 or B1100, with their low forward voltage drop and fast reverse recovery, are the ideal

choice for AP8802H applications.

PWM Dimming

A Pulse Width Modulated (PWM) signal with a max resolution of 8bit, can be applied to the CTRL pin to change

the output current to a value above or below the nominal average value set by resistor RSET. To achieve this

resolution the PWM frequency has to be lower than 500Hz.

Thermal Considerations

The graph below in figure 8, gives details for power derating. This assumes the device to be mounted on a

25x25mm PCB with 1oz copper standing in still air.

Maximum Power Dissipation

2.4

2.2

2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

25

50

75

100

125

Ambient temperature (°C)

Figure 8: AP8802H Derating Curves

Package Selection

The device comes with a wide selection of packages. The suggested package is able to provide a case

temperature below 70˚C (with an ambient temperature of 25˚C) for the combination of input voltage and load

requested.

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Ordering Information

AP8802H SP - 13

Packing

Package

SP : SO-8-EP

13 : Tape & Reel

13” Tape and Reel

Package

Code

Packaging

(Note 5)

Device

Quantity

Part Number Suffix

AP8802HSP-13

SP

SO-8-EP

2500/Tape & Reel

-13

Notes: 5. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

http://www.diodes.com/datasheets/ap02001.pdf.

Marking Information

(1) SO-8-EP

( Top View )

5

8

A~Z : Internal code

Logo

YY : Year : 08, 09,10~

WW : Week : 01~52; 52

Part No.

AP8802H

E

YYWWX X

represents 52 and 53 week

X : Internal Code

SO-8-EP

1

4

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: SO-8-EP

Detail "A"

7°~9°

Exposed pad

45°

1

7°~9°

0.15/0.25

3.3Ref.

Bottom View

0.3/0.5

1.27typ

Gauge Plane

Seating Plane

4.85/4.95

0.62/0.82

1

Detail "A"

8x-0.60

Exposed pad

6x-1.27

Land Pattem Recommendation

(Unit:mm)

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2

AP8802H

60V 1A LED Step-down Converter

IMPORTANT NOTICE

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS

DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A

PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other

changes without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability

arising out of the application or use of this document or any product described herein; neither does Diodes Incorporated convey any

license under its patent or trademark rights, nor the rights of others. Any Customer or user of this document or products described

herein in such applications shall assume all risks of such use and will agree to hold Diodes Incorporated and all the companies

whose products are represented on Diodes Incorporated website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized

sales channel.

Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall

indemnify and hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees

arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names

and markings noted herein may also be covered by one or more United States, international or foreign trademarks.

LIFE SUPPORT

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without

the express written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided

in the labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected

to cause the failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or

systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements

concerning their products and any use of Diodes Incorporated products in such safety-critical, life support devices or systems,

notwithstanding any devices- or systems-related information or support that may be provided by Diodes Incorporated. Further,

Customers must fully indemnify Diodes Incorporated and its representatives against any damages arising out of the use of Diodes

Incorporated products in such safety-critical, life support devices or systems.

www.diodes.com

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June 2010

AP8802H

Document number: DS32227 Rev. 1 - 2


型号：	AP8802HSP-13
厂家：	DIODES INCORPORATED
描述：	60V 1A LED Step-down Converter 60V 1A LED降压转换器转换器稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
文件：	总11页 (文件大小：190K)
中文：	中文翻译
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