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ISL6755

Data Sheet

September 29, 2008

FN6442.1

ZVS Full-Bridge PWM Controller with

Average Current Limit

The ISL6755 is a high-performance extension of the Intersil

family of full-bridge ZVS controllers. Like the ISL6753, it

achieves ZVS operation by driving the upper bridge FETs at

a fixed 50% duty cycle while the lower bridge FETS are

trailing-edge modulated with adjustable resonant switching

delays.

Adding to the ISL6753’s feature set is average current

monitoring. The signal may be used for average current

limiting, current sharing circuits and average current mode

control.

This advanced BiCMOS design features low operating

current, adjustable oscillator frequency up to 2MHz,

adjustable soft-start, precision deadtime and resonant delay

control, and short propagation delays. Additionally,

Multi-Pulse Suppression ensures alternating output pulses

at low duty cycles where pulse skipping may occur.

Features

• Adjustable Resonant Delay for ZVS Operation

• Voltage- or Current-Mode Operation

• 3% Current Limit Threshold

• Adjustable Average Current Limit

• 175µA Startup Current

• Supply UVLO

• Adjustable Deadtime Control

• Adjustable Soft-Start

• Adjustable Oscillator Frequency Up to 2MHz

• Tight Tolerance Error Amplifier Reference Over Line,

Load, and Temperature

• 5MHz GBWP Error Amplifier

• Adjustable Cycle-by-Cycle Peak Current Limit

• Fast Current Sense to Output Delay

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

TEMP.

RANGE

(°C)

PACKAGE

(Pb-free)

PKG.

DWG. #

• 70ns Leading Edge Blanking

• Multi-Pulse Suppression

• Buffered Oscillator Sawtooth Output

• Internal Over-Temperature Protection

• Pb-Free (RoHS

Compliant)

ISL6755AAZA* 6755 AAZ

-40 to +105 20 Ld QSOP M20.15

*Add -T suffix to part number for tape and reel packaging

NOTE: 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.

Applications

• ZVS Full-Bridge Converters

• Telecom and Datacom Power

• Wireless Base Station Power

Pinout

ISL6755

(20 LD QSOP)

TOP VIEW

VR 1

ER

C U 2

TB F

R 3

TD

RSE 4

EDL

C 5

T

FB 6

2

FB 7

1

RM 8

AP

C 9

S

IO T 10

U

20 V E

RF

19 S

S

18 V D

D

17 O TLL

U

16 O TLR

U

15 O TU

U L

14 O TU

U R

13 N

/C

12 G D

N

11 G D

N

• File Server Power

• Industrial Power Systems

1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

|

Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

Functional Block Diagram

VDD

OUTUL

VDD

VREF

UVLO

PWM

STEERING

LOGIC

OUTLL

PWM

OUTLR

50%

OUTUR

OVER-

TEMPERATURE

PROTECTION

2

GND

VREF

RESDEL

IOUT

CT

RTD

CTBUF

SS

FN6442.1

September 29, 2008

SAMPLE

AND

HOLD

+

-

OVER CURRENT

COMPARATOR

1.00V

+70 nS

LEADING

EDGE

BLANKING

CS

ISL6755

4X

RAMP

OSCILLATOR

PWM

COMPARATOR

VREF

+

-

0.33

VERR

80mV

VREF

1 mA

SOFTSTART

CONTROL

+

-

0.6V

FB1

+

-

FB2

Typical Application - High Voltage Input ZVS Full-Bridge Converter

VIN+

CR2

T3

CR3

Q2

Q8A

Q8B

Q1

C9

+

C1

T1

C11

R19

R20

Q5A

Q5B

C12

R12

3

400 VDC

Q10A

Q10B

C10

Q9A

Q9B

Q6A

Q4

Q6B

Q7A

Q7B

Q3

VIN-

C8

T2

CR1

R19

R8

U1

ISL6755

1 VERR

2 CTBUF

3 RTD

4 RESDEL

5 CT

6 FB2

R7

7 FB1

8 RAMP

9 CS

R10

R1

R2

10 IOUT

VREF 20

SS 19

VDD 18

OUTLL 17

OUTLR 16

OUTUL 15

OUTUR 14

N/C 13

GND 12

GND 11

R11

R4

R9

BIAS

VDD

C2

R5

R6

C3

R3

C5

C6

C7

C4

CR5

RETURN

L1

C16

CR4

C16

+

C13

R13

+ Vout

ISL6755

R18

R17

R16

C14

U2

C15

R15

U3

R14

FN6442.1

September 29, 2008

ISL6755

Absolute Maximum Ratings

Supply Voltage, V

DD

. . . . . . . . . . . . . . . . . . . GND - 0.3V to +22.0V

OUTxxx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to V

DD

Signal Pins . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to V

REF

+ 0.3V

V

REF

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 6.0V

Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1A

Latchup (Note 3) . . . . . . . . . . . . . . . . . . . Class II, Level B @ +85°C

Thermal Information

Thermal Resistance (Typical)

θ

JA

(°C/W)

20 Lead QSOP (Note 1). . . . . . . . . . . . . . . . . . . . . .

88

Maximum Junction Temperature . . . . . . . . . . . . . . .-55°C to +150°C

Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C

Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below

http://www.intersil.com/pbfree/Pb-FreeReflow.asp

Operating Conditions

Temperature Range

ISL6755AAxx . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C

Supply Voltage Range (Typical). . . . . . . . . . . . . . . 9VDC to 16VDC

CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and

result in failures not covered by warranty.

NOTES:

1.

θ

JA

is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.

2. All voltages are with respect to GND.

3. Jedec Class II pulse conditions and failure criterion used. Level B exceptions are using a pulse limited to 50mA.

Electrical Specifications

Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application

schematic. 9V < V

DD

< 20V, RTD = 10.0kΩ, CT = 470pF, T

A

= -40°C to +105°C, Typical values are at

T

A

= +25°C; Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified.

Temperature limits established by characterization and are not production tested.

TEST CONDITIONS

MIN

TYP

MAX

UNITS

PARAMETER

SUPPLY VOLTAGE

Supply Voltage

Start-Up Current, I

DD

Operating Current, I

DD

UVLO START Threshold

UVLO STOP Threshold

Hysteresis

REFERENCE VOLTAGE

Overall Accuracy

Long Term Stability

Operational Current (source)

Operational Current (sink)

Current Limit

CURRENT SENSE

Current Limit Threshold

CS to OUT Delay

Leading Edge Blanking (LEB) Duration

CS to OUT Delay + LEB

CS Sink Current Device Impedance

Input Bias Current

IOUT Sample and Hold Buffer Amplifier Gain

IOUT Sample and Hold VOH

IOUT Sample and Hold VOL

-

V

DD

= 5.0V

R

LOAD

, C

OUT

= 0

-

8.00

6.50

-

175

11.0

8.75

7.00

1.75

20

400

15.5

9.00

7.50

-

µA

mA

V

I

VREF

= 0mA to -10mA

T

A

= +125°C, 1000 hours (Note 4)

4.850

-

-10

5

5.000

3

-

5.150

-

-100

V

mV

mA

V

REF

= 4.85V

-15

VERR = V

REF

Excl. LEB

0.97

-

1.00

35

70

-

4.00

-

1.03

-

150

20

1.0

4.15

-

0.3

V

ns

Ω

µA

V/V

V

T

A

= +25°C

V

CS

= 1.1V

V

CS

= 0.3V

T

A

= +25°C

V

CS

= max, I

LOAD

= -300µA

V

CS

= 0.00V, I

LOAD

= 10µA

-

-1.0

3.85

3.9

-

4

FN6442.1

September 29, 2008

ISL6755

Electrical Specifications

Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application

schematic. 9V < V

DD

< 20V, RTD = 10.0kΩ, CT = 470pF, T

A

= -40°C to +105°C, Typical values are at

T

A

= +25°C; Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified.

Temperature limits established by characterization and are not production tested.

(Continued)

TEST CONDITIONS

MIN

TYP

MAX

UNITS

PARAMETER

RAMP

RAMP Sink Current Device Impedance

RAMP to PWM Comparator Offset

Bias Current

PULSE WIDTH MODULATOR

Minimum Duty Cycle

Maximum Duty Cycle (per half-cycle)

V

RAMP

= 1.1V

T

A

= +25°C

V

RAMP

= 0.3V

-

65

-5.0

-

80

-

20

95

-2.0

Ω

mV

µA

VERR < 0.6V

VERR = 4.20V, V

RAMP

= 0V,

V

CS

= 0V (Note 5)

RTD = 2.00kΩ, CT = 220pF

RTD = 2.00kΩ, CT = 470pF

-

0.85

-

94

97

99

-

0.8

0.33

-

0

-

1.20

0.9

0.35

V

SS

%

V

V/V

V

Zero Duty Cycle VERR Voltage

VERR to PWM Comparator Input Offset

VERR to PWM Comparator Input Gain

Common Mode (CM) Input Range

ERROR AMPLIFIERS

Input Common Mode (CM) Range

GBWP

VERR VOL

VERR VOH

VERR Pull-Up Current Source

EA Reference

EA Reference + EA Input Offset Voltage

OSCILLATOR

Frequency Accuracy, Overall

(Note 4)

I

LOAD

= 2mA

I

LOAD

= 0mA

VERR = 2.5V

T

A

= 25°C

(Note 4)

T

A

= +25°C

0.7

0.31

0

5

-

4.20

0.8

0.594

0.590

-

1.0

0.600

VREF

-

0.4

-

1.3

0.606

0.612

V

MHz

V

mA

V

165

-10

183

-

0.3

4.5

1.5

-200

20

0.80

2.80

2.00

-

2.0

201

+10

1.7

-

-207

23

0.88

2.88

2.05

2.03

2

2.05

kHz

%

µA

µA/µA

V

V/V

Frequency Variation with VDD

Temperature Stability

T

A

= +25°C, (F

20V

- - F

10V

)/F

10V

VDD = 10V, |F

-40°C

- F

0°C

|/F

0°C

|F

0°C

- F

105°C

|/F

25°C

(Note 4)

-

-193

19

Charge Current

Discharge Current Gain

CT Valley Voltage

CT Peak Voltage

CT Pk-Pk Voltage

RTD Voltage

RESDEL Voltage Range

CTBUF Gain (V

CTBUFP-P

/V

CTP-P

)

T

A

= +25°C

Static Threshold

Static Value

0.75

2.75

1.92

1.97

0

V

CT

= 0.8V, 2.6V

1.95

5

FN6442.1

September 29, 2008

参数名称	属性值
Product Attribute	Attribute Value
制造商 Manufacturer	Intersil ( Renesas )
产品种类 Product Category	Switching Controllers
RoHS	Details
Number of Outputs	4 Output
Switching Frequency	2000 kHz
占空比 - 最大 Duty Cycle - Max	99 %
Output Voltage	22 V
Output Current	100 mA
最小工作温度 Minimum Operating Temperature	- 40 C
最大工作温度 Maximum Operating Temperature	+ 105 C
安装风格 Mounting Style	SMD/SMT
封装 / 箱体 Package / Case	QSOP-20
系列 Packaging	Cut Tape
系列 Packaging	Reel
类型 Type	Current Mode PWM Controllers
Moisture Sensitive	Yes
工厂包装数量 Factory Pack Quantity	2500
单位重量 Unit Weight	0.008508 oz

	ISL6755AAZA-T
描述	Switching Controllers ZVS FL BRDG PWM CNTR 20LD QSOP W/ANNEAL
Product Attribute	Attribute Value
制造商 Manufacturer	Intersil ( Renesas )
产品种类 Product Category	Switching Controllers
RoHS	Details
Number of Outputs	4 Output
Switching Frequency	2000 kHz
占空比 - 最大 Duty Cycle - Max	99 %
Output Voltage	22 V
Output Current	100 mA
最小工作温度 Minimum Operating Temperature	- 40 C
最大工作温度 Maximum Operating Temperature	+ 105 C
安装风格 Mounting Style	SMD/SMT
封装 / 箱体 Package / Case	QSOP-20
类型 Type	Current Mode PWM Controllers
Moisture Sensitive	Yes
工厂包装数量 Factory Pack Quantity	2500
单位重量 Unit Weight	0.008508 oz
系列 Packaging	Reel

ISL6755AAZA-T

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