APE1705S-12 - Advanced Power Electronics Corp. USA

200801173

This datasheet contains new product information. Advanced Power Electronics Corp. reserves the rights to modify the product specification without notice. No liability is

assumed as a result of the use of this product. No rights under any patent accompany the sale of the product.

APE1705

150KHz, 3A PWM Buck DC/DC Converter

 GENERAL DESCRIPTION

The APE1705 series are monolithic IC designed for a step-down DC/DC converter,

and own the ability of driving a 3A load without additional transistor. It saves board

space. The external shutdown function can be controlled by logic level and then come

into standby mode. The internal compensation makes feedback control having 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 against over current operating of the output switch. If current limit function

occurs and VFB is down below 0.5V, the switching frequency will be reduced. The

APE1705 series operates at a switching frequency of 150KHz thus allow smaller sized

filter components than what would be needed with lower frequency switching

regulators. Other features include a guaranteed ±4% tolerance on output voltage

under specified input voltage and output load conditions, and ±15% on the oscillator

frequency. The output version included fixed 3.3V, 5V, 12V, and an adjustable type.

The chips are available in a 5-Lead TO-263 and 5-Lead TO-220 package.

 FEATURES

- Output voltage: 3.3V, 5V, 12V and adjustable output version.

- Adjustable version output voltage range, 1.23V to 38.5V.

- 150KHz ±15% fixed switching frequency.

- Voltage mode non-synchronous PWM control.

- Thermal-shutdown and current-limit protection.

- ON/OFF shutdown control input.

- Short Circuit Protect (SCP).

- Operating voltage can be up to 40V.

- Output load current: 3A.

- 5-Lead TO-263 and TO-220 Pb-Free packages.

- Low power standby mode.

- Built-in switching transistor on chip.

Advanced Power

Electronics Corp.

APE1705

 BLOCK DIAGRAM

150kHz

OSC.

START

Thermal

Shutdown

CONTROL

DRIVER

COMP.

Vss

200mV

220mV

SWITCH

COMP.

VCC

Current

limit

_AMP

COMP.

CURRENT

SOURCE

BIAS

1.235V

REFERENCE 2.5V

REGULATOR

ADJ : R2=0Ω, R1=OPEN

 PIN ASSIGNMENT

The package of APE1705 are TO263-5L and TO220-5L(R); the pin assignment is given by:

Name Description

VCC Operating voltage input

SW Switching output

VSS GND pin

FB Output voltage feedback control

TO263-5L

( Top View ) 1 VCC

5 EN

4 FB/OUT

3 VSS

2 SW

Metal

Tab

GND

( Side View )

EN ON/OFF Shutdown

1 VCC

4 FB/OUT

3 VSS

2 SW

Metal

Tab

GND

( Top View )

( Side View )

TO220-5L

5 EN

Metal

Tab

GND

( Top View )

( Side View )TO220-5LR

1 VCC

4 FB/OUT

3 VSS

2 SW

5 EN

150KHz, 3A PWM Buck DC/DC Converter

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Electronics Corp.

OUT Output voltage feedback control

for ADJ version

APE1705

 ORDER INFORMATION

Order Information

APE1705X -XX

Package Type

S: TO263-5L

P :TO220-5L

PR:TO220-5L-R

33:3.3V

50:5.0V

12: 12V

Blank:ADJ

Output Voltage

 MARKING INFORMATION

Top Marking

ADJ

YWWSSS

1705X ID code: internal

WW: 01~52

Year : 6 = 2006

Part number

FIX

YWWSSS

1705XOutput Voltage

ID code: internal

WW: 01~52

Year : 6 = 2006

-50 Part number

150KHz, 3A PWM Buck DC/DC Converter

Advanced Power

Electronics Corp.

APE1705

 Absolute Maximum Ratings

Characteristics Symbol Rating Unit

Maximum Supply Voltage VCC +45 V

ON/OFF Pin Input Voltage VEN -0.3 to 40 V

Feedback Pin Voltage (for ADJ version) VFB

-0.3 to 20 V

Output Voltage to Ground (for Fixed version) VOUT

0.7 to 45 V

Power Dissipation Internally limited PD ( TJ-TA ) / θJA W

Storage Temperature Range TST -65 to +150 ℃

Operating Temperature Range TOP -40 to +125 ℃

Operating Supply Voltage VOP +4.5 to +40 V

Thermal Resistance from Junction to case θJC TO263=3.5,TO220=3.5 /W℃

Thermal Resistance from Junction to ambient θJA TO263=25,TO220=25 /W℃

Note : θJA is measured with the PCB copper area(need connect to VSS pins) of approximately 3 in2 (Multi-layer).

 Electrical Characteristics (Unless otherwise specified, Ta=25°C, VCC=12V for 3.3V, 5V,

adjustable version and VCC=18V for the 12V version. ILOAD = 0.2A)

Characteristics Symbol

Conditions Min Typ Max Units

Quiescent Current ICCQ VFB=12V force driver off 4 8 mA

-50

Feedback bias current IFB VFB=1.3V

(Adjustable version only) -10

-100 nA

200

Shutdown supply Current ISD EN pin=5V

VCC=40V 100

300 uA

Oscillator frequency FOSC 127 150 173 KHz

(Adjustable) When VFB<0.5V 60 KHz

Oscillator frequency of short

circuit protect FSCP (Fixed)When < VOUT*40% 60 KHz

Max. Duty Cycle (ON) VFB=0V force driver on 100

Min. Duty Cycle (OFF) DC VFB=12V force driver off 0 %

Current limit ICL Pear current, No outside circuit

V FB=0V force driver on 3.5 A

Load Regulation( V△OUT/VOUT ) V△OUT IOUT = 0.2 to 3A - 0.6 1.2 %

1.4

Saturation voltage VSA T IOUT=3A, No outside circuit

VFB=0V force driver on 1.3

1.5 V

SW pin=0V No outside circuit

VFB=12V force driver off -200 uA

SW pin=-0.8V

SW pin

leakage

current

ISW L

VCC=40V force driver off -5 mA

VIL Low (regulator ON) - 0.6

EN pin logic input threshold

voltage VIH High (regulator OFF) 2.0 1.3 - V

EN pin logic input current IHVEN=2.5V (OFF) -0.1 -5

EN pin input current ILVEN=0.5V (ON) -0.01 -1 uA

Thermal shutdown Temp TSD 135 ℃

150KHz, 3A PWM Buck DC/DC Converter

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APE1705

 Electrical Characteristics (Continued)

version Characteristics Symbol

Conditions Min Typ Max Units

Output Feedback

voltage V FB

4.5V < VCC < 40V

0. 2A < ILOAD < 3A

VOUT programmed

for 3V

1.193

/1.180 1.23 1.267

/1.280

APE1705-ADJ

Efficiency η VCC = 12V, ILOAD=3A 74 %

Output voltage V OUT 4.75V < VCC < 40V

0.2A < ILOAD < 3A

3.168

/3.135 3.3 3.432

/3.465

APE1705-3.3V

Efficiency η VCC = 12V, ILOAD=3A 75 %

Output voltage V OUT 7V < VCC < 40V

0.2A < ILOAD < 3A

4.80

/4.75 5.0 5.20

/5.25

APE1705-5.0V

Efficiency η VCC = 12V, ILOAD=3A 80 %

Output voltage V OUT 15V < VCC < 40V

0.2A < ILOAD < 3A

11.52

/11.40 12 12.48

/12.60

APE1705-12V

Efficiency η VCC = 24V, ILOAD = 3A 89 %

Specifications with boldface type are for full operating temperature range, the other type

are for TJ=25ºC.

150KHz, 3A PWM Buck DC/DC Converter

Advanced Power

Electronics Corp.

APE1705

 Application Circuit

(1) VIN=12V

0.1uF D1

B340A

33uH

1 2

470uF

Vcc

Vss

Vout=5.0V/3AVIN=12V

ON/OFF

0.1uF R2

1.5K

4.7K

(2) VIN=24V

0.1uF D1

B340A

47uH

1 2

470uF

Vcc

Vss

Vout=5.0V/3AVIN=24V

0.1uF R2

1.5K

4.7K

Vout = VFB

(1 +R2

R1 ), VFB = 1.23V, R2 = 0.7K ~ 3K

VOUT R2 R1

5.0V 1.5K 4.7K

3.3V 1.5K 2.5K

2.5V 1.5K 1.5K

(3) Fixed Output Voltage Version

0.1uF D1

B340A

47uH

1 2

470uF

Vcc

Vss

Vout=5.0V/3AVIN=24V

0.1uF

L1 recommend value (IOUT=3A,)

VOUT 2.5V 3.3V 5V 12V

VIN=12V 33uH 33uH 33~47uH NA

VIN=24V 33uH 33uH 47uH 68uH

150KHz, 3A PWM Buck DC/DC Converter

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Electronics Corp.

APE1705

 Function Descriptions

Pin Functions

Vcc

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.

Vss

Circuit ground.

Internal switch. The voltage at this pin switches between (+VCC – VSAT) and

approximately – 0.5V, with a duty cycle of approximately VOUT / VCC. To minimize

coupling to sensitive circuitry, the PC board copper area connected to this pin should

be minimized.

Feedback

Senses the regulated output voltage to complete the feedback loop.

Allows the switching regulator circuit to be shutdown using logic level signals thus

dropping the total input supply current to approximately 100uA. 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 Vcc) shuts the regulator down. If this shutdown

feature is not needed, the EN pin can be wired to the ground pin.

Thermal Considerations

The TO-263-5L 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 APE1705 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 APE1705 (TO263-5L package)

operating as a buck-switching regulator in an ambient temperature of 25℃ (still air).

These temperature increments are all approximate and are affected by many factors.

Higher ambient temperatures requires more heat sinker.

150KHz, 3A PWM Buck DC/DC Converter

Advanced Power

Electronics Corp.

APE1705

 Function Descriptions (C ontinued)

For the best thermal performance, wide copper traces and generous amounts of

printed circuit board copper (need connect to the VSS pins) should be used in the

board layout, (One exception is the SW(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 increments are all

approximate. The increments are affected by a lot of factors. 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.

150KHz, 3A PWM Buck DC/DC Converter

Advanced Power

Electronics Corp.

APE1705

 Typical Characteristics

Output Ripple

IN=12V, VOUT=5V, IOUT=3A)

Power on test wave

(VIN=12V, VOUT=5V, IOUT=3A )

Load Transient Response

IN=12V, VOUT=5V, IOUT=0.2~3A)

EN on test wave

(VIN=12V, VOUT=5V, IOUT=3A )

Efficiency

(VIN=12V, VOUT=5.0V)

Efficiency

(VIN=24V, VOUT=5.0V)

Vin=12V

10%

20%

30%

40%

50%

60%

70%

80%

90%

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Iout(A)

Efficiency(%)

Vin=12V

10%

20%

30%

40%

50%

60%

70%

80%

90%

0.0 0.5 1.0 1.5 2.0 2.5 3.0

Iout(A)

Efficiency(%)

VIN

VOUT

ISW

VOUT (AC)

ISW

VOUT (AC)

ISW

VOUT

VIN

ISW

150KHz, 3A PWM Buck DC/DC Converter

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Electronics Corp.

Package Outline : TO-263-5L

Millimeters

MIN NOM MAX

A 4.40 4.60 4.80

b 0.66 0.79 0.91

L4 0.00 0.15 0.30

c 0.36 0.43 0.50

L1 2.29 2.54 2.79

E 9.80 10.10 10.40

c2 1.25 1.35 1.45

D 8.60 8.80 9.00

L 14.60 15.20 15.80

0° 4° 8°

1.All Dimensions Are in Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : TO-263-5L

7.60

1.27

5.90

1.70

SYMBOLS

ADVANCED POWER ELECTRONICS CORP.

Package Code

1705S-XX

YWWSSS

Part Numbe

YWWSSS LOGO

Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

Output Voltage

Package Outline : TO-220-5L

Millimeters

MIN NOM MAX

A4.07 4.45 4.82

b0.76 0.89 1.02

C0.36 0.50 0.64

D14.22 14.86 15.50

E9.78 10.16 10.54

e1.57 1.71 1.85

e1 6.68 6.81 6.93

F1.14 1.27 1.40

H1 5.46 6.16 6.86

J1 2.29 2.74 3.18

L13.21 13.97 14.73

3.68 3.81 3.94

2.54 2.73 2.92

1.All Dimensions Are in Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : TO-220-5L

SYMBOLS

ADVANCED POWER ELECTRONICS CORP.

φp

YWWSSS

Part Number

LOGO

Output Voltage

1705P-XX

Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

Package Code

Package Outline : TO-220-5LR

Millimeters

MIN NOM MAX

A4.40 4.6 4.70

b0.70 0.80 0.90

D8.40 8.70 8.90

E9.91 10.16 10.41

e1.60 1.70 1.80

F1.20 1.25 1.30

H2 20.8 21.60 22.4

H3 23.90 24.70 25.50

J1 3.7 4.50 5.3

Q2.50 2.80 3.00

1.All Dimension Are In Millimeters.

2.Dimension Does Not Include Mold Protrusions.

Part Marking Information & Packing : TO-220-5LR

ADVANCED POWER ELECTRONICS CORP.

SYMBOLS

8.40

1.00

6.30

6.40

Part Number

1705PR-XX Package Code

YWWSSS

Date Code (YWWSSS)

Y：Last Digit Of The Year

WW：Week

SSS：Sequence

Output Voltage

LOGO