ISL6740AIVZA-T Intersil, ISL6740AIVZA-T Datasheet

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ISL6740AIVZA-T

Manufacturer Part Number
ISL6740AIVZA-T
Description
IC CTRLR PWM DBL-ENDED 16-TSSOP
Manufacturer
Intersil
Datasheet

Specifications of ISL6740AIVZA-T

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
2MHz
Duty Cycle
100%
Voltage - Supply
9 V ~ 16 V
Buck
No
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 105°C
Package / Case
16-TSSOP
Frequency-max
2MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Flexible Double-Ended Voltage-Mode
PWM Controller with Voltage Feed
Forward
The ISL6740A is an enhanced ISL6740 PWM controller
featuring built-in voltage feed forward functionality. It is pin
and feature compatible with the ISL6740 double-ended
pulse width modulating (PWM) voltage-mode controller,
allowing easy drop-in replacement on existing designs.
Voltage feed forward compensates for input voltage variation
without intervention of the feedback control loop. It is
particularly useful in unregulated bus converters and DC
transformers where wide input voltage variation would
otherwise result in large output voltage swings.
In addition to voltage feed forward compensation, the
ISL6740A features an extremely flexible oscillator that
allows precise control of frequency, duty cycle, and
deadtime. Deadtimes of under 40ns are easily achievable.
This advanced BiCMOS design features low operating
current, adjustable switching frequency up to 1MHz,
adjustable soft-start, internal and external over temperature
protection, fault annunciation, and a bidirectional SYNC
signal that allows the oscillator to be locked to paralleled
units or to an external clock for noise sensitive applications.
Ordering Information
ISL6740AIVZA
(Note)
Add -T suffix to part number for tape and reel packaging
NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which are 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.
PART NUMBER
TEMP. RANGE
-40 to 105
(°C)
®
1
16 Ld TSSOP
(Pb-free)
Data Sheet
PACKAGE
M16.173
DWG. #
PKG.
1-888-INTERSIL or 1-888-352-6832
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Input Voltage Feed Forward Compensation
• Precision Duty Cycle and Deadtime Control
• Adjustable Delayed Overcurrent Shutdown and Re-Start
• Adjustable Short Circuit Shutdown and Re-Start
• Adjustable Oscillator Frequency Up to 2MHz
• Bidirectional Synchronization
• Adjustable Input Undervoltage Lockout/Inhibit
• Tight Tolerance Voltage Reference Over Line, Load, and
• Adjustable Soft-Start
• Fault Signal
• 95µA Startup Current
• Internal Over Temperature Protection
• System Over Temperature Protection Using a Thermistor
• Pb-free and ELV, WEEE, RoHS Compliant
Applications
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
• DC Transformers and Bus Converters
Pinout
Temperature
or Sensor
February 7, 2005
All other trademarks mentioned are the property of their respective owners.
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
V
SCSET
ERROR
UV/FF
SYNC
OUTA
GND
CS
C
T
Copyright Intersil Americas Inc. 2005. All Rights Reserved
ISL6740A (TSSOP)
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
12
13
11
10
9
OUTB
V
V
R
R
OTS
FAULT
SS
ISL6740A
REF
DD
TD
TC
FN9195.0

Related parts for ISL6740AIVZA-T

ISL6740AIVZA-T Summary of contents

Page 1

... Ordering Information TEMP. RANGE PART NUMBER (°C) PACKAGE ISL6740AIVZA -40 to 105 16 Ld TSSOP (Note) (Pb-free) Add -T suffix to part number for tape and reel packaging NOTE: Intersil Pb-free products employ special Pb-free material sets ...

Page 2

Functional Block Diagram REF V REF 5. ENABLE + - + BG - GND N_SYNC OUT Internal OT Shutdown 130 - 150 C Synchronization INHIBIT 1. EXT. SYNC INHIBIT UV/FF - ...

Page 3

Typical Application - 48V Input Bus Converter 10A Output VIN 36-75V VIN CR1 CR2 VDD R13 2 HB VSS ...

Page 4

Typical Application - Input, Regulated 12V @ 8A Output VIN 36-75V VIN VR1 CR1 CR2 R14 U1 1 VDD LO 8 R13 ...

Page 5

Absolute Maximum Ratings Supply Voltage GND - 0.3V to +20.0V DD OUTA, OUTB, Signal Pins . . . . . ...

Page 6

Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application Schematic. 9V < V values are at T PARAMETER Minimum Duty Cycle Maximum Duty Cycle V to PWM Comparator Input Gain ERROR C to PWM ...

Page 7

Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application Schematic. 9V < V values are at T PARAMETER SOFT-START Charging Current SS Clamp Voltage Sustained Overcurrent Threshold Voltage Overcurrent/Short Circuit Discharge Current Fault SS ...

Page 8

Typical Performance Curves 1.001 1 0.999 0.998 0.997 -40 -25 - TEMPERATURE (°C) FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE 4 1•10 CT (pF) = 1000 680 470 330 3 1•10 220 100 100 ...

Page 9

V - The inverting input of the PWM comparator. The ERROR error voltage is applied to this pin to control the duty cycle. Increasing the signal level increases the duty cycle. The node may be driven with an external error ...

Page 10

Oscillator The ISL6740A has an oscillator with a programmable frequency range to 2MHz, and can be programmed with two resistors and a capacitor. The use of three timing elements ...

Page 11

UV/Inhibit fault; otherwise inactive and does not affect the node voltage. The magnitude of the hysteresis is a function of the external resistor divider impedance. If the resistor divider impedance results in too little hysteresis, a series resistor ...

Page 12

SS 0 OUTA OUTB FIGURE 7. PULSE-BY-PULSE OC BEHAVIOR ...

Page 13

V SCSET ⋅ ---------------------- - D SC max 2 where D is the maximum short circuit duty cycle the voltage applied ...

Page 14

If the hysteresis resistor, R3, is not desired, the value of the thermistor resistance at the reset temperature can be determined from: • 2.5 R2 Ω ---------------------------------------- NTC – 5 • 2 – • ...

Page 15

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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