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ISL6742B 데이터시트 PDF




Intersil에서 제조한 전자 부품 ISL6742B은 전자 산업 및 응용 분야에서
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부품번호 ISL6742B 기능
기능 Advanced Double-Ended PWM Controller
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ISL6742B 데이터시트, 핀배열, 회로
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.




ISL6742B pdf, 반도체, 판매, 대치품
ISL6742B
Pin Descriptions (Continued)
PIN #
14
15
16
SYMBOL
DESCRIPTION
VDD VDD is the power connection for the IC. To optimize noise immunity, bypass VDD to GND with a 0.1µF or larger high frequency
ceramic capacitor as close to the VDD and GND pins as possible.
VDD is monitored for supply voltage undervoltage lock-out (UVLO). The start and stop thresholds track each other resulting in
relatively constant hysteresis.
VADJ
A 0V to 5V control voltage applied to this input sets the relative delay or advance between OUTA/OUTB and OUTAN/OUTBN.
Voltages below 2.425V result in OUTAN/OUTBN being advanced relative to OUTA/OUTB. Voltages above 2.575V result in
OUTAN/OUTBN being delayed relative to OUTA/OUTB. A voltage of 2.50V ±75mV results in zero phase difference. A weak internal
50% divider from VREF results in no phase delay if this input is left floating.
The range of phase delay/advance is either zero or 40ns to 300ns with the phase differential increasing as the voltage deviation
from 2.5V increases. The relationship between the control voltage and phase differential is non-linear. The gain (Δt/ΔV) is low for
control voltages near 2.5V and rapidly increases as the voltage approaches the extremes of the control range. This behavior
provides the designer increased accuracy when selecting a shorter delay/advance duration.
When the PWM outputs are delayed relative to the SR outputs (VADJ < 2.425V), the delay time should not exceed 90% of the
deadtime as determined by RTD and CT.
SS Connect the soft-start timing capacitor between this pin and GND to control the duration of soft-start. The value of the capacitor
determines the rate of increase of the duty cycle during start-up. Although no minimum value of capacitance is required, it is
recommended that a value of at least 100pF be used for noise immunity.
SS may also be used to inhibit the outputs by grounding through a small transistor in an open collector/drain configuration.
4 FN8565.0
January 31, 2014

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ISL6742B 전자부품, 판매, 대치품
Typical Application - High Voltage Input Secondary Side Control Full-Bridge Converter
VIN+
Q1 Q5A R13 CR4
T3
CR3
R14 Q6A Q2
Q5B Q6B
C9 C10
+
400 VDC
C1
Q4
Q7A R12
Q7B
CR6
C8
Q11A
Q11B
R15
C11
CR5
Q3
Q8A
R11 Q8B
C7
C6 Q12A
Q12B
VIN-
SECONDARY
BIAS
SUPPLY
T2
CR1
CR2
VREF
Q15
R9
R6
R21
R7
C12
R8
C3
1 VREF
SS 16
2 VERR VADJ 15
3 RTD VDD 14
4 CT OUTA 13
5 FB OUTB 12
6 RAMP OUTAN 11
7 CS OUTBN 10
8 IOUT GND 9
U1
ISL6742B
C13
C2
R2 R3
C4
C5
R5
R10
C14
R4
C15
T1
R17
C18
Q16
Q15
R16
L1
C19 C20 C21 +
+ VOUT
RETURN
Q13A
Q13B
Q14A
Q14B
VREF
R22
R23
R20
C17
C16 R18
CR7
-
+
U3
C22 R19

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관련 데이터시트

부품번호상세설명 및 기능제조사
ISL6742

Advanced Double-Ended PWM Controller

Intersil Corporation
Intersil Corporation
ISL6742B

Advanced Double-Ended PWM Controller

Intersil
Intersil

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