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ISL6430CB の電気的特性と機能

ISL6430CBのメーカーはIntersil Corporationです、この部品の機能は「Single Sync Buck PWM Controller for Broadband Gateway Applications」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL6430CB
部品説明 Single Sync Buck PWM Controller for Broadband Gateway Applications
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL6430CB Datasheet, ISL6430CB PDF,ピン配置, 機能
®
Data Sheet
July 2003
ISL6430
FN9017.2
Single Sync Buck PWM Controller for
Broadband Gateway Applications
The ISL6430 provides complete control and protection for a
DC-DC converter optimized for high-performance broadband
gateway applications. It is designed to drive two N Channel
MOSFETs in a synchronous-rectified buck topology. The
ISL6430 integrates all of the control, output adjustment,
monitoring and protection functions into a single package.
The output voltage of the converter can be precisely
regulated to as low as 1.27V, with a maximum tolerance of
±1% over temperature and line voltage variations.
The ISL6430 provides simple, single feedback loop, voltage-
mode control with fast transient response. It includes a
200kHz free-running triangle-wave oscillator that is
adjustable from below 50kHz to over 1MHz. The error
amplifier features a 15MHz gain-bandwidth product and
6V/µs slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty ratio
ranges from 0% to 100%.
The ISL6430 protects against over-current conditions by
inhibiting PWM operation. The ISL6430 monitors the current
by using the rDS(ON) of the upper MOSFET which eliminates
the need for a current sensing resistor.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
PKG. DWG. #
ISL6430CB
0 to 70 14 Ld SOIC
M14.15
ISL6430CR
0 to 70 16 Ld QFN
L16.5x5B
Add -T suffix to either option for tape and reel packaging.
Pinout
ISL6430 (SOIC)
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
Features
• Drives Two N-Channel MOSFETs
• Operates From +5V or +12V Input
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
- 1.27V Internal Reference
- ±1% Over Line Voltage and Temperature
• Over-Current Fault Monitor
- Does Not Require Extra Current Sensing Element
- Uses MOSFETs rDS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to Over 1MHz
• 14-Lead SOIC and 16-Lead QFN
Applications
• Cable Modems, Set-Top Boxes and DSL Modems
• DSP and Core Communications Processor Supplies
• High-Power 5V Input DC-DC Regulators
• Low-Voltage Distributed Power Supplies
ISL6430 (QFN)
TOP VIEW
16 15 14 13
NC 1
COMP 2
FP 3
EN 4
12 PVCC
11 LGATE
10 PGND
9 BOOT
5678
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2003. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.

1 Page





ISL6430CB pdf, ピン配列
ISL6430
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15.0V
Boot Voltage, VBOOT - VPHASE . . . . . . . . . . . . . . . . . . . . . . +15.0V
Input, Output or I/O Voltage . . . . . . . . . . . . GND -0.3V to VCC +0.3V
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +12V ±10%
Ambient Temperature Range. . . . . . . . . . . . . . . . . . . . . 0oC to 70oC
Junction Temperature Range . . . . . . . . . . . . . . . . . . . 0oC to 125oC
Thermal Information
Thermal Resistance
θJA (oC/W) θJC (oC/W)
SOIC Package (Note 1) . . . . . . . . . . . .
67
N/A
QFN Package (Note 2). . . . . . . . . . . . .
35
5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
(SOIC Lead tips only)
For Recommended soldering conditions see Tech Brief TB389.
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.
NOTE:
1. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
2. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. θJC, the
“case temp” is measured at the center of the exposed metal pad on the package underside. See Tech Brief TB379.
Electrical Specifications Recommended operating conditions, unless otherwise noted.
PARAMETER
SYMBOL
TEST CONDITIONS
VCC SUPPLY CURRENT
Nominal Supply
Shutdown Supply
ICC EN = VCC; UGATE and LGATE Open
EN = 0V
POWER-ON RESET
Rising VCC Threshold
Falling VCC Threshold
Enable - Input threshold Voltage
Rising VOCSET Threshold
OSCILLATOR
VOCSET = 4.5VDC
VOCSET = 4.5VDC
VOCSET = 4.5VDC
Free Running Frequency
Total Variation
Ramp Amplitude
REFERENCE
VOSC
RT = OPEN, VCC = 12
6k< RT to GND < 200k
RT = OPEN
Reference Voltage
ERROR AMPLIFIER
DC Gain
Gain-Bandwidth Product
GBW
Slew Rate
SR COMP = 10pF
GATE DRIVERS
Upper Gate Source
Upper Gate Sink
Lower Gate Source
Lower Gate Sink
PROTECTION
IUGATE
RUGATE
ILGATE
RLGATE
VBOOT - VPHASE = 12V, VUGATE = 6V
ILGATE = 0.3A
VCC = 12V, VLGATE = 6V
ILGATE = 0.3A
OCSET Current Source
Soft Start Current
IOCSET
ISS
VOCSET = 4.5VDC
MIN TYP MAX UNITS
- 5 - mA
-
50 100
µA
- - 10.4
8.2 -
-
0.8 - 2.0
- 1.27 -
V
V
V
V
185 200 215
kHz
-15 - +15 %
- 1.9 - VP-P
1.258 1.270 1.282
V
- 88 -
dB
- 15 - MHz
- 6 - V/µs
350 500
-
- 5.5 10
300 450
-
- 3.5 6.5
mA
mA
170 200 230
- 10 -
µA
µA
3


3Pages


ISL6430CB 電子部品, 半導体
ISL6430
in the normal operating load range, find the ROCSET resistor
from the equation above with:
1. The maximum rDS(ON) at the highest junction
temperature.
2. The minimum IOCSET from the specification table.
3. Determine IPEAK for IPEAK > IOUT(MAX) + (∆I) ⁄ 2 ,
where I is the output inductor ripple current.
For an equation for the ripple current see the section under
component guidelines titled ‘Output Inductor Selection’.
A small ceramic capacitor should be placed in parallel with
ROCSET to smooth the voltage across ROCSET in the
presence of switching noise on the input voltage.
Application Guidelines
Layout Considerations
As in any high frequency switching converter, layout is very
important. Switching current from one power device to
another can generate voltage transients across the
impedances of the interconnecting bond wires and circuit
traces. These interconnecting impedances should be
minimized by using wide, short printed circuit traces. The
critical components should be located as close together as
possible using ground plane construction or single point
grounding.
VIN
ISL6430
UGATE
PHASE
LGATE
PGND
Q1 LO VOUT
Q2 D2
CIN
CO
RETURN
FIGURE 5. PRINTED CIRCUIT BOARD POWER AND
GROUND PLANES OR ISLANDS
Figure 5 shows the critical power components of the
converter. To minimize the voltage overshoot the
interconnecting wires indicated by heavy lines should be part
of ground or power plane in a printed circuit board. The
components shown in Figure 6 should be located as close
together as possible. Please note that the capacitors CIN
and CO each represent numerous physical capacitors.
Locate the ISL6430 within 3 inches of the MOSFETs, Q1
and Q2. The circuit traces for the MOSFETs’ gate and
source connections from the ISL6430 must be sized to
handle up to 1A peak current.
Figure 6 shows the circuit traces that require additional
layout consideration. Use single point and ground plane
construction for the circuits shown. Minimize any leakage
current paths on the SS PIN and locate the capacitor, Css
close to the SS pin because the internal current source is
only 10µA. Provide local VCC decoupling between VCC and
GND pins. Locate the capacitor, CBOOT as close as
practical to the BOOT and PHASE pins.
SS
CSS
ISL6430
GND
BOOT
CBOOT
PHASE
D1
+12V
VCC
CVCC
+VIN
Q1 LO
VOUT
Q2 CO
FIGURE 6. PRINTED CIRCUIT BOARD SMALL SIGNAL
LAYOUT GUIDELINES
OSC
PWM
COMPARATOR
VOSC
-
+
VIN
DRIVER
DRIVER
LO VOUT
PHASE
CO
ESR
(PARASITIC)
ZFB
VE/A
-
+
ZIN
ERROR REFERENCE
AMP
DETAILED COMPENSATION COMPONENTS
C2
C1 R2
ZFB
VOUT
ZIN
C3 R3
COMP
FB
-
+
ISL6430
REF
R1
FIGURE 7. VOLTAGE - MODE BUCK CONVERTER
COMPENSATION DESIGN
6

6 Page



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共有リンク

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部品番号部品説明メーカ
ISL6430CB

Single Sync Buck PWM Controller for Broadband Gateway Applications

Intersil Corporation
Intersil Corporation
ISL6430CR

Single Sync Buck PWM Controller for Broadband Gateway Applications

Intersil Corporation
Intersil Corporation


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