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PDF ISL6742B Data sheet ( Hoja de datos )

Número de pieza ISL6742B
Descripción Advanced Double-Ended PWM Controller
Fabricantes Intersil 
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No Preview Available ! ISL6742B Hoja de datos, Descripción, Manual

Advanced Double-Ended PWM Controller
ISL6742B
The ISL6742B is a high-performance double-ended PWM
controller with advanced synchronous rectifier control and
current limit features. It is suitable for both current- and
voltage-mode control methods.
The ISL6742B includes complemented PWM outputs for
synchronous rectifier (SR) control. The complemented outputs
may be dynamically advanced or delayed relative to the main
outputs using an external control voltage.
Its advanced current sensing circuitry employs sample and
hold methods to provide a precise average current signal.
Suitable for average current limiting, a technique which
virtually eliminates the current tail-out common to peak
current limiting methods, it is also applicable to current
sharing circuits and average current mode control.
This advanced BiCMOS design features an adjustable oscillator
frequency up to 2MHz, internal over-temperature protection,
precision deadtime control, and short propagation delays.
Additionally, Multi-Pulse Suppression ensures alternating output
pulses at low duty cycles where pulse skipping may occur.
Ordering Information
PART #
(Notes 1, 2, 3)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6742BAAZA ISL6742 BAAZ -40 to +105 16 Ld QSOP M16.15A
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 ISL6742B. For more information on MSL, please see tech
brief TB363.
Features
• Synchronous rectifier control outputs with adjustable
delay/advance
• Adjustable average current signal
• 3% tolerance cycle-by-cycle peak current limit
• Fast current sense to output delay
• Adjustable oscillator frequency up to 2MHz
• Adjustable deadtime control
• Voltage- or current-mode operation
• Separate RAMP and CS inputs for voltage feed-forward or
current-mode applications
• Tight tolerance error amplifier reference over line, load, and
temperature
• 175µA start-up current
• Supply UVLO
• Adjustable soft-start
• 70ns leading edge blanking
• Multi-pulse suppression
• Internal over-temperature protection
• Pb-Free (RoHS compliant)
Applications
• Half-bridge, full-bridge, interleaved forward, and push-pull
converters
• Telecom and datacom power
• Wireless base station power
• File server power
• Industrial power systems
Related Literature
• See AN1890, “ISL6742BEVAL3Z Power Converter 36V to
75V Input, 12V Output Up to 10A”
January 31, 2014
FN8565.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.

1 page




ISL6742B pdf
Functional Block Diagram
VDD
GND
VREF
IOUT
UVLO
OVER-
TEMPERATURE
PROTECTION
4X
VREF
SAMPLE
AND
HOLD
CT
RTD
SS
OSCILLATOR
VREF
PWM
STEERING
LOGIC
VDD
DELAY/
ADVANCE
TIMING
CONTROL
+
- 1.00V
OVERCURRENT
COMPARATOR
+70ns
LEADING
EDGE
BLANKING
OUTA
OUTB
OUTAN
OUTBN
VADJ
CS
PWM
COMPARATOR
+
-
80mV
0.33
SOFT-START
CONTROL
VREF
1mA
RAMP
+ 0.6V
-
VERR
FB

5 Page





ISL6742B arduino
ISL6742B
Typical Performance Curves
1.02
1.01
1.00
0.99
0.98
-40 -25 -10 5 20 35 50 65 80 95 110
TEMPERATURE (°C)
FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE
25
24
23
22
21
20
19
18
0
200 400 600 800
RTD CURRENT (µA)
1000
FIGURE 2. CT DISCHARGE CURRENT GAIN vs RTD CURRENT
1•104
1•103
1•103
CT =
1000pF
680pF
100 470pF
330pF
220pF
100pF
10 0 10 20 30 40 50 60 70 80 90 100
RTD (k)
FIGURE 3. DEADTIME (DT) vs CAPACITANCE
100
10
0.1
1
CT (nF)
RTD =
10k
50k
100k
10
FIGURE 4. CAPACITANCE vs FREQUENCY
Functional Description
Features
The ISL6742B PWM is an excellent choice for low cost bridge and
push-pull topologies in applications requiring accurate duty cycle
and deadtime control. With its many protection and control
features, a highly flexible design with minimal external
components is possible. Among its many features are current- or
voltage-mode control, adjustable soft-start, peak and average
overcurrent protection, thermal protection, synchronous rectifier
outputs with variable delay/advance timing, and adjustable
oscillator frequency.
Oscillator
The ISL6742B oscillator, with a programmable frequency range
to 2MHz, is set with only an external resistor and capacitor.
The switching period is the sum of the timing capacitor charge
and discharge durations. The charge duration is determined by
CT and a fixed 200µA internal current source. The discharge
duration is determined by RTD and CT.
tC 11.5 103 CT
S
tD ≈ (0.06 RTD CT) + 50 109
S
(EQ. 1)
(EQ. 2)
tSW
=
tC + tD
=
-----1-------
FSW
S
(EQ. 3)
where tC and tD are the charge and discharge times, respectively,
tSW is the oscillator period, and FSW is the oscillator frequency.
Since the ISL6742B is a double-ended controller, one output
switching cycle requires two oscillator cycles. The actual charge
and discharge times will be slightly longer than calculated due to
internal propagation delays of approximately 10ns/transition.
This delay adds directly to the switching duration, but also causes
slight overshoot of the timing capacitor peak and valley voltage
thresholds, effectively increasing the peak-to-peak voltage on the
timing capacitor. Additionally, if very low discharge currents are
used, there will be increased error due to the input impedance at
the CT pin.
11 FN8565.0
January 31, 2014

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