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ISL6535 の電気的特性と機能

ISL6535のメーカーはIntersil Corporationです、この部品の機能は「Synchronous Buck Pulse-Width Modulator (PWM) Controller」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL6535
部品説明 Synchronous Buck Pulse-Width Modulator (PWM) Controller
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL6535 Datasheet, ISL6535 PDF,ピン配置, 機能
®
Data Sheet
January 17, 2006
ISL6535
FN9255.0
Synchronous Buck Pulse-Width
Modulator (PWM) Controller
The ISL6535 is a high performance synchronous controller
for demanding DC/DC converter applications. It provides
overcurrent fault protection and is designed to safely startup
into prebiased output loads.
The output voltage of the converter can be precisely
regulated to as low as 0.597V, with a maximum tolerance of
±1% over the commercial temperature range, and ±1.5%
over the industrial temperature range.
The ISL6535 provides simple, single feedback loop, voltage-
mode control with fast transient response. It includes a
triangle-wave oscillator that is adjustable from below 50kHz
to over 1.5MHz. Full (0% to 100%) PWM duty cycle support
is provided.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate which enables high converter
bandwidth for fast transient performance.
The ISL6535's overcurrent protection monitors the current
by using the rDS(ON) of the upper MOSFET which eliminates
the need for a current sensing resistor.
Pinouts
ISL6535
(14 LD NARROW SOIC AND 16 LD QFN)
TOP VIEW
RT 1
OCSET 2
SS 3
COMP 4
FB 5
EN 6
GND 7
14 VCC
13 PVCC
12 LGATE
11 PGND
10 BOOT
9 UGATE
8 PHASE
16 15 14 13
SS 1
COMP 2
FB 3
EN 4
12 PVCC
11 LGATE
10 PGND
9 BOOT
5678
Features
• Operates from +12V Input
• Excellent Output Voltage Regulation
- 0.597V Internal Reference
- ±1% Over the Commercial Temperature Range
- ±1.5% Over the Industrial Temperature Range
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
- Leading and Falling Edge Modulation
• Small Converter Size
- Constant Frequency Operation
- Oscillator Programmable from 50kHz to Over 1.5MHz
• 12V High Speed MOSFET Gate Drivers
- 2.0A Source/3A Sink at 12V Low Side Gate Drive
- 1.25A Source/2A Sink at 12V High Side Gate Drive
- Drives Two N-Channel MOSFETs
• Overcurrent Fault Monitor
- High-Side MOSFET’s rDS(ON) Sensing
- Reduced ~120ns Blanking Time
• Converter can Source and Sink Current
• Soft-Start Done and an External Reference Pin for
Tracking Applications are Available in the QFN Package
• Pin Compatible with ISL6522
• Supports Start-Up into Prebiased Loads
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Power Supply for some Pentium®, PowerPC™, as well as
Graphic CPUs
• High-Power 12V Input DC/DC Regulators
• Low-Voltage Distributed Power Supplies
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL6535CBZ 6535CBZ 0 to 70 14 Ld SOIC M14.15
ISL6535IBZ 6535IBZ -40 to 85 14 Ld SOIC M14.15
ISL6535CRZ 6535CRZ 0 to 70 16 Ld 4x4 QFN L16.4x4
ISL6535IRZ 6535IRZ -40 to 85 16 Ld 4x4 QFN L16.4x4
Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal 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.
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.
Copyright Intersil Americas Inc. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL6535 pdf, ピン配列
Simplified Power System Diagram
ISL6535
+12V
Cvcc
RFS
ISL6535
ROCSET
+1.2V to +12VIN
Q1
LOUT
COUT
Q2
CSS
R2
R1
VOUT
Typical Application
+12VIN
RFILTER
CF1
VCC
SSDONE
(QFN ONLY)
REFIN
(QFN ONLY)
LIN
CF2 DBOOT
CHFIN
PVCC
BOOT
OCSET
UGATE
ROCSET
COCSET
Q1
PHASE
EN
LGATE
Q2
RRT
RT
ISL6535
PGND
CBIN
CBOOT
LOUT
CHFOUT
SS
CSS
COMP
C1
FB
GND
C2
R2
RO
C3 R3
R1
VOUT
CBOUT
3 FN9255.0
January 17, 2006


3Pages


ISL6535 電子部品, 半導体
ISL6535
OCSET (Pin 2/15)
The current limit is programmed by connecting this pin with a
resistor and capacitor to the drain of the high side MOSEFT.
A 200µA current source develops a voltage across the resis-
tor which is then compared with the voltage developed
across the high side MOSFET. A blanking period of 120ns is
provided for noise immunity.
SS (Pin 3/1)
Connect a capacitor from this pin to ground. This capacitor,
along with an internal 30µA current source, sets the soft-start
interval of the converter.
COMP (Pin 4/2) and FB (Pin 5/3)
COMP and FB are the available external pins of the error
amplifier. The FB pin is the inverting input of the error ampli-
fier and the COMP pin is the error amplifier output. These
pins are used to compensate the voltage-control feedback
loop of the converter.
EN (Pin 6/4)
This pin is a TTL compatible input. Pull this pin below 0.8V to
disable the converter. In shutdown the soft-start pin is dis-
charged and the UGATE and LGATE pins are held low.
GND (Pin 7/6)
Signal ground for the IC. All voltage levels are measured
with respect to this pin.
PHASE (Pin 8/7)
This pin connects to the source of the high side MOSFET
and the drain of the low side MOSFET. This pin represents
the return path for the high side gate driver. During normal
switching, this pin is used for high side current sensing.
UGATE (Pin 9/8)
Connect UGATE to the upper MOSFET gate. This pin pro-
vides the gate drive for the upper MOSFET.
BOOT (Pin 10/9)
This pin provides bias to the upper MOSFET driver. A boot-
strap circuit may be used to create a BOOT voltage suitable
to drive a standard N-Channel MOSFET.
PGND (Pin 11/10)
This is the power ground connection. Tie the lower MOSFET
source and board ground to this pin.
LGATE (Pin 12/11)
Connect LGATE to the lower MOSFET gate. This pin pro-
vides the gate drive for the lower MOSFET.
PVCC (Pin 13/12)
Provide a 12V ±10% bias supply for the lower gate drive to
this pin. This pin should be bypassed with a capacitor to
PGND.
VCC (Pin 14/13)
Provide a 12V bias supply for the chip to this pin. The pin
should be bypassed with a capacitor to GND.
REFIN (QFN ONLY Pin 5)
Upon enable if REFIN is less than 2.2V, the external refer-
ence pin is used as the control reference instead of the inter-
nal 0.597V reference. An internal 6µA pull up to 5V is
provided for disabling this functionality.
SSDONE (QFN ONLY Pin 16)
Provides an open drain signal at the end of soft-start.
Functional Description
Initialization
The ISL6535 automatically initializes upon receipt of power.
Special sequencing of the input supplies is not necessary.
The Power-On Reset (POR) function continually monitors
the bias voltage at the VCC pin and the driver input on the
PVCC pin. When the voltages at VCC and PVCC exceed
their rising POR thresholds, a 30µA current source driving
the SS pin is enabled. Upon the SS pin exceeding 1V, the
ISL6535 begins ramping the non-inverting input of the error
amplifier from GND to the System Reference. During
initialization the MOSFET drivers pull UGATE to PHASE and
LGATE to PGND.
Soft-start
During soft-start, an internal 30µA current source charges the
external capacitor (CSS) on the SS pin up to ~4V. If the
ISL6535 is utilizing the internal reference, then as the SS pin’s
voltage ramps from 1V to 3V, the soft-start function scales the
reference input (positive terminal of error amp) from GND to
VREF (0.597V nominal). If the ISL6535 is utilizing an
VEN
VOUT
VSS
tSS
FIGURE 3. TYPICAL SOFT-START INTERVAL
externally supplied reference, when the voltage on the SS pin
reaches 1V, the internal reference input (into of the error amp)
ramps from GND to the externally supplied reference at the
same rate as the voltage on the SS pin. Figure 3 shows a
6 FN9255.0
January 17, 2006

6 Page



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