DATASHEET

ISL6731A, ISL6731B

Power Factor Correction Controllers

The ISL6731A and ISL6731B are active power factor

correction (PFC) controller ICs that use a boost topology. The

controllers are suitable for AC/DC power systems up to 2kW

and over the universal line input.

The ISL6731A and ISL6731B operate in Continuous Current

Mode (CCM). Accurate input current shaping is achieved with a

current error amplifier. A patent pending breakthrough

negative capacitance technology minimizes zero crossing

distortion and reduces the magnetic components size. The

small external components result in lower design cost without

sacrificing performance.

The internally clamped 12.5V gate driver delivers 1.5A peak

current to the external power MOSFET. The ISL6731A and

ISL6731B provide a highly reliable system that is fully

protected. Protection features include cycle-by-cycle

overcurrent, over power limit, over-temperature, input

brownout, output overvoltage and undervoltage protection.

The ISL6731A and ISL6731B provide excellent power

efficiency and transitions into a power saving skip mode

during light load conditions, thus improving efficiency

automatically. The ISL6731A and ISL6731B can be shut down

by pulling the FB pin below 0.5V or grounding the BO pin.

Two switching frequency options are provided. The ISL6731B

switches at 62kHz, and the ISL6731A switches at 124kHz.

FN8582

Rev 1.00

February 13, 2015

Features

• Reduced component size requirements

- Enables smaller, thinner AC/DC adapters

- Choke and cap size can be reduced

- Lower cost of materials

• Excellent power factor and THD over line and load

- CCM mode with negative capacitance generator for

smaller EMI filter and improved performance

- Built-in current amplifier with flexibility of gain change

• Better light-load efficiency

- Automatic pulse skipping with programmable threshold

- Programmable or automatic shutdown

• Highly reliable design

- Cycle-by-cycle current limit

- Input average power limit

- OVP and OTP protection

- Input brownout protection

• Small 14 Ld SOIC package

Applications

• Desktop computer AC/DC adaptor

• Laptop computer AC/DC adaptor

• TV AC/DC power supply

• AC/DC brick converters

Related Literature

•

AN1884,

"ISL6731AEVAL1Z and ISL6731BEVAL1Z: Boost

CCM PFC for 300W Universal Input Adaptors"

•

AN1885,

“ISL6731AEVAL2Z and ISL6731BEVAL2Z: High

Performance Boost CCM PFC Front End for Server Power

Applications”

V

LINE

V

I

100

+

V

OUT

95

90

EFFICIENCY (%)

85

80

75

70

65

60

0

20

40

60

OUTPUT POWER (%)

80

100

ISL6731A, NON-SKIP

ISL6731A, SKIP

VCC

ISEN

ICOMP

VIN

GND

BO

GATE

OVP

ISL6731A

FB

COMP

SKIP VREG

FIGURE 1. TYPICAL APPLICATION

FIGURE 2. PFC EFFICIENCY

FN8582 Rev 1.00

February 13, 2015

Page 1 of 20

ISL6731A, ISL6731B

Pin Configuration

ISL6731A, ISL6731B

(14 LD SOIC)

TOP VIEW

NC 1

GND 2

ISEN 3

ICOMP 4

VIN 5

BO 6

OVP 7

14 GATE

13 NC

12 VCC

11 VREG

10 SKIP

9 FB

8 COMP

Pin Descriptions

PIN #

1, 13

2

3

4

5

I/O

-

I

I/O

I

SYMBOL

NC

GND

ISEN

ICOMP

VIN

Not Connected. Must be floating.

Ground pin. All voltage levels refer to this pin.

Current sense pin. The current through this pin is proportional to the inductor current.

Current error amplifier output pin.

Input voltage sense. This pin provides the reference voltage to shape inductor current. Connect this pin to a resistor divider

from the rectified input voltage. The resistor divider ratio is used to adjust the phase lag between input voltage and the

input current. The phase lag is required to compensate the phase lead generated by the EMI filter.

This pin should be decoupled to GND with a minimum 0.1µF ceramic capacitor. The BO pin is a voltage follower, which will

follow the DC voltage of the VIN pin. The BO pin is internally tied to GND through a resistor R

IS

. The decoupling capacitor

provides ripple filtering. When the voltage at the BO pin (V

BO

) drops below brownout voltage threshold, the controller

enters shutdown mode and the gate drive is disabled. The BO pin will be disabled when the FB pin drops below the enabling

threshold.

Overvoltage protection pin. Connect this pin to a resistor divider from the output. The resistor divider sets the OVP set point.

When the OVP pin voltage exceeds 104.5% of the reference voltage V

REF

, OVP is triggered and the gate drive is disabled.

Output of the error amplifier. The voltage of the COMP pin sets the input power. During start-up, a small charge current will

slowly ramp up the voltage of the COMP pin.

Voltage feedback pin. Connect this pin to a resistor divider from the output. The resistor divider sets the output voltage.

When the FB pin voltage exceeds 104% of V

REF

, OVP is triggered and gate drive is disabled. When the FB pin drops below

10% of V

REF

, the device is put into shutdown mode. There is an internal pull-down current source for open loop protection.

This pin has dual functions. Connecting this pin to ground disables the light load skip function. An internal 20μA current

sources out of this pin. Connect a resistor from this pin to the ground to set the average power trip point. The converter

exits the skip mode when either the VFB drops below 88% of V

REF

, or the ISEN current goes above 29μA.

Output of internal regulator. The voltage having a ±2% tolerance over line, load and operating temperature. Bypass to GND

with a 47nF low ESR capacitor. VREG can source up to 10mA. This pin is not recommended for usage other than bypass.

Power supply pin. The VCC pin should be decoupled to GND with a minimum 0.1µF ceramic capacitor.

Push-pull gate drive for the external MOSFET. Output voltage is clamped at 12.5V. This pin provides typically 2A sink and

1.5A source capability.

DESCRIPTION

6

I/O

BO

7

8

9

I

I/O

I

OVP

COMP

FB

10

I/O

SKIP

11

12

14

-

I

O

VREG

VCC

GATE

FN8582 Rev 1.00

February 13, 2015

Page 2 of 20

ISL6731A, ISL6731B

Ordering Information

PART NUMBER

(Notes

1, 2, 3)

ISL6731AFBZ

ISL6731BFBZ

NOTES:

1. Add “-T*” suffix for tape and reel. Please refer to

TB347

for details on reel specifications.

2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte

tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil

Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.

3. For Moisture Sensitivity Level (MSL), please see device information page for

ISL6731A, ISL6731B.

For more information on MSL please see techbrief

TB363.

PART

MARKING

ISL 6731AFBZ

ISL 6731BFBZ

TEMP.

RANGE (°C)

-40 to +125

14 Ld SOIC

PACKAGE

(Pb-Free)

PKG.

DWG. #

M14.15

TABLE 1. KEY DIFFERENCES IN FAMILY OF ISL6731

VERSION

Switching Frequency

ISL6731A

124kHz

ISL6731B

62kHz

FN8582 Rev 1.00

February 13, 2015

Page 3 of 20

Block Diagram

EMI CHOKE

FN8582 Rev 1.00

February 13, 2015

Page 4 of 20

ISL6731A, ISL6731B

V

I

L

F

L

C

F1

Q

1

D

V

OUT

C

OUT

V

LINE

C

F3

L

m

C

F2

D

F1

D

F2

R

CS

C

REG

VCC

VREG

CURRENT

MIRROR

2:1

R

SEN

ISEN

I OC

I CS > -------------

-

2

I CS

OTP

UVLO

LINEAR

REGULATOR

VCC

GATE

CONTROL

LOGIC

GND

PWM

COMP

CEQ GEN.

ICOMP

I

REF

Gmi

0.25 ¥ VIN

----------------------------COMPB

2

BO

R

IN2

VIN

COMPB

COMP-1V

V

R ¥I

IS ISEN

= ---------------------------------

-

CS

2

OSCILLATOR

SKIP

Vro2

R

OV1

OVP

Vro1

R

OV2

R

IS

SOFT-START

ENABLE

Vref

R

FB2

SKIP

CLAMP

OVERPOWER

LIMIT

Gmv

FB

R

FB1

R

IN1

20µA

I

FB

BO

C

BO

SKIP

COMP

Application Schematics

Typical 300W Application Schematic

D1

IN5406

L1

0u

L2

1.5m

D2

2

1

VOUT

DC+

TP9

P2

1

C19

C1

0.1

270u

450V

P1

AC1

2

3

2

3

F1 8A

+

TP12

GATE1

C22

-

DB1

GBU806

C3

680n

R28 0.22

R27 0.22

R5 0.22

C8

220n

D8 D7

S1M S1M

R14

30k

47n

C20

R2

2.2

2

P4

AC2

L4

2.2m

L3

2.2m

R3

2M

1

4

1

4

R4

51k

3

470n

RV1

MOV /DNP

2

11

12

1

13

6

10

8

3

2

FN8582 Rev 1.00

February 13, 2015

Page 5 of 20

ISL6731A, ISL6731B

C3D04060A

SPP20N60C3

Q1

1

C21

0.1

R1

2M

390V

UNIVERSAL INPUT

90~265Vac

C2

470n

P3

GND

2.2n

C35

2.2n

C36

2.2n 2.2n

C5 C6

DZ1

3.3V

PE

P5

C12

DNP

C9

TP7

DNP

1u

DNP

VCC

VREG

GATE

C11

TP8

R8

R24

1n

C7

470k

U1

3.3M

6.8n

1u

VREG Lin.Reg. VCC

C10

GATE

14

UVLO LOGIC

4

ICOMP

R9

TP6

R11

3k

GND

2

ICOMP

CEQ OTP

470k

3

ISENI MIRROR

Gen

2:1

TP5

ISEN

OVP

7

PWM

Vin*C

I*= 4*BO*BO

I*

gm

VIN

C23

2.5V

5

VIN

1n

C SKIP OPL

TP3

FB

9

gm

+

-

SKIP

COMP

BO

R13

C13

VCC

ISL6731A/B

5.76k

47p

R21

TP4 69.8K

TP2

25k

R22

DNP

2N7002

BO

COMP

Q2

1

DNP

P8

C15

R18

150n

C14

62k

DNP

C17

470n

R20

1n

10k

DNP

C18

P9

1u

DNP

R23

3.3M

R6

TP10

C26

2.2n

R10

3.3M

DNP

TP11

OVP

42.2k

R25

R26

49.9

TP1

R17

0

C16

100n

R19

42.2k

FB

VCC

GND

P6

P7

参数名称	属性值
Brand Name	Renesas
厂商名称	Renesas(瑞萨电子)
零件包装代码	SOICN
针数	14
制造商包装代码	M14.1514
Reach Compliance Code	compliant
Samacsys Description	PFC Controllers Power Factor Correction Controllers
模拟集成电路 - 其他类型	POWER FACTOR CONTROLLER

	ISL6731AFBZ-T
描述	Power Factor Correction - PFC PFC Controller
Brand Name	Renesas
厂商名称	Renesas(瑞萨电子)
零件包装代码	SOICN
针数	14
制造商包装代码	M14.1514
Reach Compliance Code	compliant
Samacsys Description	PFC Controllers Power Factor Correction Controllers
模拟集成电路 - 其他类型	POWER FACTOR CONTROLLER

ISL6731AFBZ-T

ISL6731AFBZ-T在线购买

ISL6731AFBZ-T概述

ISL6731AFBZ-T规格参数

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