intersil ISL6740A DATA SHEET
®
www.BDTIC.com/Intersil
ISL6740A
Data Sheet February 7, 2005
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
TEMP. RANGE
PART NUMBER
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.
(°C) PACKAGE
-40 to 105 16 Ld TSSOP
(Pb-free)
PKG.
DWG. #
M16.173
FN9195.0
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
Temperature
• Adjustable Soft-Start
• Fault Signal
•95µA Startup Current
• Internal Over Temperature Protection
• System Over Temperature Protection Using a Thermistor
or Sensor
• 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
ISL6740A (TSSOP)
TOP VIEW
OUTA
SCSET
SYNC
V
ERROR
UV/FF
GND
C
CS
1
2
3
4
T
5
6
7
8
16
15
14
13
12
11
10
9
OUTB
V
REF
V
DD
R
TD
R
TC
OTS
FAULT
SS
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-352-6832
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
All other trademarks mentioned are the property of their respective owners.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
Functional Block Diagram
www.BDTIC.com/Intersil
V
DD
V
REF
5.00 V
1%
ENABLE
+
-
2
GND
UV/FF
I
R
R
SCSET
CS
V
ERROR
February 7, 2005
OTS
RTC
TC
I
RTD
TD
C
T
BG
1.00 V
+
-
INHIBIT/VIN UV
+
-
Internal
OT Shutdown
130 - 150 C
Oscillator
0.4
INHIBIT
CLK
0.4
V
REF
N_SYNC OUT
EXT. SYNC
Short Circuit
Detection
0.6 V
+
-
-
100
4.5 k
Bi-Directional
Synchronization
OC DETECT
+
-
PWM
COMPARAT OR
SYNC
SYNC IN
SS DONE
0.5
FL
V
REF
70µA
OUTA
OUTB
SS
ISL6740A
FAULT
Q
T
Q
PWM TOGGLE
SC S/D
SRQ
SS LOW
-
+
4.5 V
SS CLAMP
RETRIGGERABLE
ONE SHOT
SRQ
Q
PWM LATCH
RESET
DOMINANT
SS
-
V
/2
REF
+
Q
SC LATCH
SS DONE
300 k
Q
Q
50 µS
INHIBIT
OC S/D
OC LATCH
SRQ
Q
V
REF
SC S/D
UV 4.65 V
SS HI
OC S/D
+
-
4.25 V
0.27 VSS LOW
+
-
FAULT LATCH
SET DOMINANT
SRQ
FL
Q
-
+
+
BG
-
ON
15µA
V
REF
FN9195.0
Typical Application - 48V Input Bus Converter, 9V @ 10A Output
www.BDTIC.com/Intersil
VIN+
Q1
C2
3
36-75V
VIN-
February 7, 2005
C1
R2
R1
C3
1
VDD
HB
2
HO
3
HS
4 5
C5
C4
R3
R4
Q3
VR1
Q2
U1
LO
8
HIP2101
7
VSS
LI
6
HI
R5
R6
T2
CR1
R13
T1
CR2
R12
U3
1
OUTA
GND
2
3
SCSET
4
CT
5
SYNC
6
CS
7
VERROR
89
UV/FF SS
OUTB
VREF
VDD
ISL6740A
RTD
RTC
OTS
FAULT
FN9195.0
C6
C8
QR1
C11
L1
QR2
16
15
14
13
12
11
10
R11
R8
RT1
R10
C9C7
C10
R7
R9
+9V
RTN
ISL6740A
SYNC
FAULT
Typical Application - 36 to 75 V Input, Regulated 12V @ 8A Output
www.BDTIC.com/Intersil
VIN+
CR3
Q1
C2
T1
R22
QR1
C11
L1
+12V
RTN
4
C1
U1
HIP2101
VSS
Q2
8
LO
7
6
LI
HI
R5
R6
R2
36-75V
R1
VIN-
February 7, 2005
C3
1
VDD
HB
2
HO
3
4 5
C5
C4
R3
R4
Q3
VR1
HS
FN9195.0
T2
CR1
R13
C6 C9C7
CR2
R14
1
OUTA
2
GND
3
SCSET
4
CT
5
SYNC
6
CS
7
VERROR
89
UV/FF SS
R7
U2
ISL6740A
FAULT
CR4
R23
OUTB
VREF
VDD
RTD
RTC
OTS
C8
QR2
R17
R18
R19
R20
C13
R21
C12
ISL6740A
R16
U3
2801-1
VR2
16
15
14
13
12
11
10
R12
C10
RT1
U4
TL431
R8
R9
C14
R10
R15
R11
SYNCSYNC
SYNC I/O
FAULT
ISL6740A
www.BDTIC.com/Intersil
Absolute Maximum Ratings Thermal Information
Supply Voltage, VDD . . . . . . . . . . . . . . . . . . . GND - 0.3V to +20.0V
OUTA, OUTB, Signal Pins . . . . . . . . . . . . . . . . .GND - 0.3V to V
VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 6.0V
Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
ESD Classification
Human Body Model (Per MIL-STD-883 Method 3015.7) . . .1500V
Charged Device Model (Per EOS/ESD DS5.3, 4/14/93) . . .1000V
REF
Thermal Resistance Junction to Ambient (Typical) θ
16 Lead TSSOP (Note 1) . . . . . . . . . . . . . . . . . . . 102
Maximum Junction Temperature . . . . . . . . . . . . . . . . -55°C to 150°C
Maximum Storage Temperature Range. . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C
(TSSOP- Lead Tips Only)
Operating Conditions
Temperature Range
ISL6740AIVx. . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 105°C
Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . 9VDC-16 VDC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
1. θ
JA
2. All voltages are with respect to GND.
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
Schematic. 9V < V
values are at T
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
SUPPLY VOLTAGE
Start-Up Current, I
Operating Current, I
UVLO START Threshold 6.50 7.25 8.00 V
UVLO STOP Threshold 6.00 6.75 7.50 V
Hysteresis 0.35 0.50 0.75 V
REFERENCE VOLTAGE
Overall Accuracy I
Long Term Stability T
Fault Voltage 4.10 4.55 4.75 V
VREF Good Voltage 4.25 4.75 V
Hysteresis 75 165 250 mV
Operational Current (source) -20 - - mA
Operational Current (sink) 5--mA
Current Limit -25 - -100 mA
CURRENT SENSE
Current Limit Threshold V
CS to OUT Delay -3550ns
CS Sink Current -10-mA
Input Bias Current -1.00 - 1.00 µA
SCSET Input Impedance 1- -MΩ
SC Setpoint Accuracy -10-%
PULSE WIDTH MODULATOR
V
Input Impedance 400 - - kΩ
ERROR
DD
DD
< 20 V, RTD = 51.1kΩ, R
DD
= 25°C
A
V
< START Threshold - 95 140 µA
DD
R
, C
LOAD
C
OUTA,B
= 0, -20mA 4.900 5.000 5.050 V
VREF
= 125°C, 1000 hours (Note 4) - 3 - mV
A
= V
ERROR
= 0 - 5.0 8.0 mA
OUTA,B
= 1nF - 7.0 12.0 mA
REF
= 10kΩ, CT = 470pF, TA = -40°C to 105°C (Note 3), Typical
TC
REF
-.05
0.55 0.6 0.65 V
(°C/W)
JA
V
5
FN9195.0
February 7, 2005
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