Diodes AP1506 User Manual

AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

Description

The AP1506 series are monolithic IC designed for a stepdown DC/DC converter, and own the ability of driving a 3A load without external transistor. Due to reducing the number of external components, the board space can be saved easily. The external shutdown function can be controlled by logic level and then come into standby mode. The internal compensation makes feedback control have good line and load regulation without external design. Regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is to prevent over current operating of the output switch. If current limit function occurred and V frequency will be reduced. The AP1506 series operate at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Other features include a guaranteed + input voltage and output load conditions, and + oscillator frequency. The output version included fixe d 3.3V, 5V, 12V, and an adjustable type. The packages are available in a standard 5-lead TO263 and TO220.

is down to 0.5V below, the switching

FB

4% tolerance on output voltage under specified

15% on the

Pin Assignments

( Top View )

Metal Tab GND

TO263-5L

( Top View )

TO220-5L/TO220-5L(R)

5 SD 4 FB 3 Gnd 2 Output

1 V

IN

5 SD 4 FB 3 Gnd 2 Output 1 V

IN

Features

Applications

• Output Voltage: 3.3V, 5V, 12V and Adjustable Output Version

• Adjustable Version Output Voltage Range, 1.23V to 18V+4%

• 150KHz +15% Fixed Switching Frequency

• Voltage Mode Non-Synchronous PWM Control

• Thermal-Shutdown and Current-Limit Protection

• ON/OFF Shutdown Control Input

• Operating Voltage can be up to 22V

• Output Load Current: 3A

• Lead Free packages: TO263-5L and TO220-5L(R)

• TO263-5L and TO220-5L(R): Available in “Green” Molding Compound (No Br, Sb)

• Low Power standby mode

• Built-in Switching Transistor On Chip

• 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

.

• Simple High-Efficiency Step-Down Regulator

• On-Card Switching Regulators

• Positive to Negative Converter

AP1506

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×

Typical Application Circuit

(1) Fixed Type Circuit

AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

12V

DC Input

C

IN

Capacitor

(2) Adjustable Type Circuit

12V

DC Input

C

IN

Capacitor

(3) Delay Start Circuit

FB

4

AP1506

1

V

IN

R2

V

IN

-33

5

SD

12

AP1506

SD

V

out

V

FB

2

3

GND

FB

4

35

= V

FB

= 1.23V

GND

R2 = 1K ~ 3K

R2

Output

(1 +

Schottky Diode

R1

Schottky Diode

R1

)

R2

R1

33

Inductor

D1*

L1

uH

L1

47uH

3.3V/3A

Output Load

Co

Capacitor

5V/ 3A

Output Load

Co

Capacitor

FB

12V

DC Input

C

IN

Capacitor

V

C

DELAY

0.1uF

4

Output

AP1506

1

IN

5

SD

R

DELAY

2

3

GND

Schottky Diode

L1

47uH

D1*

5V / 3A

Output Load

Co

Capacitor

10K

Notes: 2. For up to 2A = DFLS230L (Vf = 0.42V)

For up to 3A = B340LA, B340LB (V

= 0.45V)

f

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Pin Descriptions

Pin Name Description

VIN Operating Voltage Input

Output Switching Output

GND Ground

FB Output Voltage Feedback Control SD ON/OFF Shutdown

Functional Block Diagram

AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

SD

FB

Current

Source

bias

1.235V

Reference

+

Amp

-

2.5V

Regulator

Frequecy

compen-

sation

Start

up

-

Comp +

150KHz

OSC.

200mV

Comp

Pre-driver

Thermal

Shutdown

V

IN

220mV

+

-

+

3A

Switch

Output

GND

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AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD MM Machine Model ESD Protection 400 V

VCC Supply Voltage +24 V VSD ON/OFF Pin Input Voltage -0.3 to +18 V VFB Feedback Pin Voltage -0.3 to +18 V

V

Output Voltage to Ground -1 V

OUT

PD Power Dissipation Internally Limited W

TST Storage Temperature -65 to +150

TOP Operating Junction Temperature -40 to +125

Recommended Operating Conditions

Symbol Parameter Min Max Unit

VOP Operating Voltage 4.5 22 V

TA Operating Ambient Temperature -20 85

o

C

o

C

o

C

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AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

Electrical Characteristics (All Output Voltage Versions)

Unless otherwise specified, V Specifications with boldface type are for full operating temperature range, the other type are for T

= 12V for 3.3V, 5V, adjustable version and V

IN

Symbol Parameter Conditions Min Typ. Max Unit

V

= 1.3V

IFB Feedback Bias Current

F

Oscillator Frequency

OSC

F

SCP

V

DC

SAT

Oscillator Frequency of Short Circuit Protect

Saturation Voltage

Max. Duty Cycle (ON) V Min. Duty Cycle (OFF) V

FB

(Adjustable version only)

When current limit occurred and V

I

OUT

< 0.5V, Ta = 25 oC

FB

= 3A

No outside circuit

= 0V force driver on

V

FB

= 0V force driver on - 100 -

FB

= 12V force driver off - 0 -

FB

Peak current

ICL Current Limit

Output Leakage Current

IL

Output = 0V Output = -1V V

IQ Quiescent Current V

I

STBY

VIL VIH High (regulator OFF) 2.0 -

IH

IL

θ

JA

Standby Quiescent Current

ON/OFF Pin Logic Input Threshold Voltage

ON/OFF Pin Logic Input Current

ON/OFF Pin Input Current

Thermal Resistance Junction to Ambient

No outside circuit

= 0 force driver on

V

FB

No outside circuit

= 12 force driver off

V

FB

= 22V - -5 - mA

IN

= 12 force driver off - 5 10 mA

FB

ON/OFF pin = 5V

= 22V

V

IN

Low (regulator ON) -

V

= 2.5V (OFF) - - -0.01

LOGIC

V

= 0.5V (ON) - -0.1 -1

LOGIC

TO263-5L (Note 3) 37 TO220-5L(R) (Note 3) 31 -

= 18V for the 12V version. I

IN

= 25ºC.

J

- -10

LOAD

-50

-100

= 0.5A

127 150 173

110

-

173

10 30 50 KHz

1.6

- 1.4

1.7

5.5

3.6 4.5

6.5

- - -200

- 70

1.3

150

200

0.6

nA

KHz

V

%

A

µA

V

µA

o

C/W

θ

JC

Notes: 3. Test condition: Device mounted with copper area of approximately 3 in2, no air flow.

Thermal Resistance Junction to Case

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o

C/W

June 2010

150KHz, 3A PWM BUCK DC/DC CONVERTER

Electrical Characteristics (Continued)

Specifications with boldface type are for full operating temperature range, the other type are for TJ = 25ºC.

AP1506-ADJ

Symbol Parameter Conditions V

VIN < 22V

V

FB

Output

Feedback

5V <

I

0.2A <

V

OUT

LOAD

programmed for

< 3A

1.193 1.23 1.267

3V

η

Efficiency V

= 12V, I

IN

= 3A - 74 - %

LOAD

Typ. V

Min

1.18

Unit

Max

-

1.28

AP1506

V

AP1506-3.3V

AP1506-5V

AP1506-12V

V

OUT

η

V

OUT

η

V

OUT

η

Output

Voltage

Efficiency V

Output

Voltage

Efficiency V

Output

Voltage

Efficiency V

5.5V <

0.2A < = 12V, I

IN

8V <

0.2A < = 12V, I

IN

15V <

0.2A <

= 16V, I

IN

VIN < 22V I

< 3A

LOAD

= 3A - 75 - %

LOAD

VIN < 22V

I

< 3A

LOAD

= 3A - 80 - %

LOAD

VIN < 22V I

< 3A

LOAD

= 3A - 89 - %

LOAD

3.168 3.3 3.432

3.135

-

3.465

4.8 5 5.2

4.75

-

5.25

11.52 12 12.48

11.4

-

12.6

V

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AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

Functional Description

Pin Functions

+V

IN

This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be presented at this pin to minimize voltage transients and to supply the switching currents needed by the regulator.

Ground

Circuit ground.

Output

Internal switch. The voltage at this pin switches between (+V of approximately V

/ VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to

OUT

this pin should be kept to a minimum.

Feedback (FB)

Senses the regulated output voltage to complete the feedback loop.

ON/OFF (SD)

Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 150uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 18V) shuts the regulator down. If this shutdown feature is not needed, the ON / OFF pin can be wired to the ground pin.

Thermal Considerations

The AP1506 is available in two packages: a 5-pin TO220 and a 5-pin surface mount TO263.

The TO220 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The AP1506 junction temperature rises above ambient temperature for a 3A load and different input and output voltages. The data for these curves was taken with the AP1506 (TO220 package) operating as a buck-switching regulator in an ambient temperature of

o

25

C (still air). These temperature rise numbers are all approximate and there are many factors that can affect

these temperatures. Higher ambient temperatures require more heat sinking.

The TO263 surface mount package tab was designed to be soldering to the copper on a printed circuit board. The copper and the board are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. The PC board copper area that the package is soldered to should be at least 0.8 in and ideally should have 2 or more square inches of 2 oz. Additional copper area improves the thermal characteristics, but with copper areas greater than approximately 6 in dissipation are realized. If further thermal improvements are needed, double sided, multi-layer PC board with large copper areas and/or airflow will be recommended.

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IN

– V

) and approximately – 0.5V, with a duty cycle

SAT

2

, only small improvements in heat

June 2010

2

,

AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

Functional Description (Continued)

The AP1506 (TO263 package) junction temperature rises above ambient temperature with a 2A load for various input and output voltages. This data was taken with the circuit operating as a buck-switching regulator with all components mounted on a PC board to simulate the junction temperature under actual operating conditions. This curve can be used for a quick check for the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. When load currents higher than 3A are used, double sided or multi-layer PC boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages.

For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout (Once exception to this is the output (switch) pin, which should not have large areas of copper). Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further.

Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are: trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board.

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f

Typical Performance Characteristics

AP1506 Efficiency vs. Temperature

(V

= 12V, V

IN

83 82 81 80 79 78 77 76 75

Efficiency (%)

74 73 72

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA)

= 5V, Io = 3A)

OUT

AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

AP1506 Efficiency vs. Temperature

(V

= 12V, V

IN

78 77 76 75 74 73 72

Efficiency (%)

71 70

-50 -30 -10 10 30 50 70 90 110 130 150

Temperatur e ( TA) (oC)

= 3.3V, Io = 3A)

OUT

AP1506 Saturation Voltage vs. Temperature

(Vcc = 12V, V

1.6

1.5

1.4

1.3

1.2

1.1 1

0.9

0.8

Saturation Voltage (V)

0.7

-50 -25 0 25 50 75 100 125

Temperature (TA)　(oC)

= 0V, VSD = 0)

FB

2A

1A

0.5A

3A

AP1506 Supply Current vs. Temperature

(Vcc = 12V, No Load, V

15 14 13 12 11 10

9 8 7 6

Supply Current (mA)

5

-50 -30 -10 10 30 50 70 90 110 130 150

Switch ON

Temperature (TA) (oC)

= 0V (Switch ON), V

on/of

AP1506 Switch Current Limit vs. Temperature

(Vcc = 12V, V

5.5

5

4.5

4

3.5

Switch Current Limit (A)

3

-50-30-101030507090

60 55 50 45 40 35

Supply Current (uA)

30

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (oC)

= 5V (Switch OFF))

on/of

Switch OFF

Temperature (TA) (oC)

= 0V)

FB

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150KHz, 3A PWM BUCK DC/DC CONVERTER

Typical Performance Characteristics (Continued)

AP1506 Threshold Voltage vs. Temperature

(Vcc = 12V, Io = 100mA)

1.7

1.6

1.5

1.4

1.3

1.2

1.1 1

0.9

Threshold Voltage (V)

0.8

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (oC)

AP1506 Frequency vs. Temperature

(Vcc = 12V, Ic = 500mA, V

170

OUT

= 5V)

AP1506 ON/OFF Current vs. ON/OFF Voltage

AP1506 Feedback Current vs. Temperature

AP1506

(V

= 12V)

IN

10

0

-10

-20

-30

-40

-50

-60

-70

-80

ON/OFF Current (nA)

-90

-100 036912151821

ON/OFF Voltage (V)

(Vcc = 12V, V

10

OUT

= 5V, V

= 1.3V)

FB

165

160

155

150

Frequency (KHz)

145

140

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (oC)

AP1506 Output Voltage vs. Temperature

(V

= 12V, Io = 3A)

IN

3.5

3.45

3.4

3.35

3.3

3.25

(V)

3.2

out

3.15

V

3.1

3.05 3

2.95

2.9

-40 -20 0 20 40 60 80 100 120 140 160

Temperature (TA) (oC)

0

-10

-20

-30

-40

Feedback Current (nA)

-50

-50 -30 -10 10 30 50 70 90 110 130 150

Temperature (TA) (oC)

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Ordering Information

AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

Output version

Blank : Adjustable

33 : 3.3V 50 : 5.0V

AP1506 - XX

Package

K5 : TO263-5L

T5 : TO220-5L

T5R : TO220-5L(R)

XXX X - X

Lead Free

L : Lead Free

G : Green

Packing

U : Tube

13 : Tape & Reel

12 : 12V

Device

AP1506-XXK5L-13 K5 TO263-5L NA NA 800/Tape & Reel -13 AP1506-XXK5G-13 K5 TO263-5L NA NA 800/Tape & Reel -13 AP1506-XXT5L-U T5 TO220-5L 50 -U NA NA AP1506-XXT5G-U T5 TO220-5L 50 -U NA NA AP1506-XXT5RL-U T5R TO220-5L(R) 50 -U NA NA AP1506-XXT5RG-U T5R TO220-5L(R) 50 -U NA NA

Notes: 4. 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.

Package

Code

Packaging

(Note 4)

Quantity

Tube/Bulk 13” Tape and Reel

Part Number

Suffix

Quantity

Part Number

Suffix

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Marking Information

(1) TO263-5L

Output Type: 1506 : ADJ 1506-33 : 3.3V 1506-50 : 5.0V 1506-12 : 12V

(2) TO220-5L(R)

( Top view )

1506-XX

YY WW

( Top view )

AP1506

150KHz, 3A PWM BUCK DC/DC CONVERTER

Logo L : Lead Free

X

G : Green

ID code

Xth week: 01~52

Year:

"07" = 2007 "08" = 2008

~

Logo

Output Type: 1506 : ADJ 1506-33 : 3.3V

1506-XX

YY WW X X

1506-50 : 5.0V 1506-12 : 12V

L : Lead Free G : Green

ID code Xth week: 01~52 Year:

"07" = 2007 "08" = 2008

~

AP1506

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150KHz, 3A PWM BUCK DC/DC CONVERTER

Package Outline Dimensions (All Dimensions in mm)

(1) Package Type: TO263-5L

AP1506

(2) Package Type: TO220-5L

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AP1506

150KHz, 3A PWM BUCK DC/DC 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 In corporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer or user of this documen t 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 p atents 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 b e 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 dev ices 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.

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