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ISL6432EVAL1 の電気的特性と機能

ISL6432EVAL1のメーカーはIntersil Corporationです、この部品の機能は「PWM and Triple Linear Power Controller for Home Gateway Applications」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL6432EVAL1
部品説明 PWM and Triple Linear Power Controller for Home Gateway Applications
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 




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ISL6432EVAL1 Datasheet, ISL6432EVAL1 PDF,ピン配置, 機能
TM
Data Sheet
ISL6432
June 2001
File Number 9019
PWM and Triple Linear Power Controller
for Home Gateway Applications
The ISL6432 provides the power control and protection for
four output voltages for use with high-performance
microprocessor and embedded controller based
communications chip sets. The IC integrates a voltage-mode
PWM controller and three linear controllers, as well as
monitoring and protection functions into a 16-lead SOIC
package. The PWM controller is intended to regulate the
microprocessor memory core voltage with a synchronous-
rectified buck converter. The linear controllers can be
configured to generate DSP power, as well as upstream and
downstream voltages. Both the switching regulator and
linear voltage references provide ±2% of static regulation
over line, load, and temperature ranges. All outputs are user-
adjustable by means of an external resistor divider. All linear
controllers employ bipolar NPNs for the pass transistors.
The ISL6432 monitors all the output voltages. The PWM
controller’s adjustable overcurrent function monitors the
output current by using the voltage drop across the upper
MOSFET’s rDS(ON). The linear regulator outputs are
monitored via the FB pins for undervoltage events.
Ordering Information
PART NUMBER TEMP. RANGE (oC) PACKAGE
PKG.
NO.
ISL6432CB
0 to 70
16 Ld SOIC M16.15
ISL6432EVAL1 Evaluation Board
Applications
Low-Power Distributed DC-DC Conversion
Cable Modem and DSL Modem Power Regulation
• High Performance Memory Applications
Features
• Provides 4 Regulated Voltages
- Memory Core, Embedded Controller/DSP, Tuner
• Drives Bipolar Linear Pass Transistors
• Externally Resistor-Adjustable Outputs
• Simple Single-Loop Control Design
- Voltage-Mode PWM Control
• Fast PWM Converter Transient Response
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Ratio
• Excellent Output Voltage Regulation
- All Outputs: ±2% Over Temperature
• Overcurrent Fault Monitors
- Switching Regulator Does Not Require Extra Current
Sensing Element, Uses MOSFET’s rDS(ON)
• Small Converter Size
- 300kHz Constant Frequency Operation
- Small External Component Count
• ACPI Compatible
• Voltage Sequencing
Pinout
ISL6432 (SOIC)
TOP VIEW
DRIVE2 1
FB2 2
FB 3
COMP 4
GND 5
PHASE 6
BOOT 7
UGATE 8
16 FB3
15 DRIVE3
14 FB4
13 DRIVE4
12 OCSET
11 VCC
10 LGATE
9 PGND
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 trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2001, All Rights Reserved

1 Page





ISL6432EVAL1 pdf, ピン配列
Simplified Power System Diagram
+5V
+3.3V
VOUT2
+
Q3
VOUT3
Q4
+
ISL6432
LINEAR
CONTROLLER
PWM
CONTROLLER
ISL6432
LINEAR
CONTROLLER
LINEAR
CONTROLLER
Q1
VOUT1
+
Q2
Q5
+
VOUT4
Typical Application
+5V
+3.3VIN
VOUT2
2.5V
+3.3VDUAL
VOUT3
1.8V
+
COUT3
Q3
+
COUT2
Rs2
DRIVE2
FB2
Rp2
Q4 DRIVE3
FB3
Rs3
Rp3
VCC
BOOT
OCSET
UGATE
PHASE
ISL6432
LGATE
PGND
FB
COMP
CBOOT
Q1
LOUT1
+
Q2 COUT1
CR1
VOUT1
2.5V
Rs1
VOUT4
1.5V
Q5
+
COUT4
DRIVE4
Rs4
Rp4
FB4
GND
Rp1
3


3Pages


ISL6432EVAL1 電子部品, 半導体
ISL6432
three-cycle wait, the fourth soft-start initiates a ramp-up
attempt of the failed output, at time T2, bringing the output in
regulation at time T4.
To exemplify an UV event on one of the linears, at time T1,
the clock regulator (VOUT2) is also subjected to an
overcurrent event, resulting in an UV condition. Similarly,
after three soft-start periods, the fourth cycle initiates a
ramp-up of this linear output at time T3. One soft-start period
after T3, the linear output is within regulation limits. UV
glitches less than 1µs (typically) in duration are ignored.
(0.5V/DIV.)
0V
UV MONITORING
VOUT3 (1.8V)
VOUT4 (1.5V)
VOUT2 (2.5V)
VOUT1 (2.5V)
ACTIVE
SOFT-START
FUNCTION
INACTIVE
T0 T1
TIME
T2 T3 T4
FIGURE 1. OVERCURRENT/UNDERVOLTAGE PROTECTION
RESPONSE
As overcurrent protection is performed on the synchronous
switcher regulator on a cycle-by-cycle basis, OC monitoring
is active as long as the regulator is operational. Since the
overcurrent protection on the linear regulators is performed
through undervoltage monitoring at the feedback pins (FB2,
FB3, and FB4), this feature is activated approximately 25%
into the soft-start interval (see Figure 1).
A resistor (ROCSET) programs the overcurrent trip level for
the PWM converter. As shown in Figure 2, the internal
40µA current sink (IOCSET) develops a voltage across
ROCSET (VSET) that is referenced to VIN . The DRIVE
signal enables the overcurrent comparator (OCC). When
the voltage across the upper MOSFET (VDS(ON)) exceeds
VSET, the overcurrent comparator trips to set the
overcurrent latch. Both VSET and VDS(ON) are referenced
to VIN and a small capacitor across ROCSET helps VOCSET
track the variations of VIN due to MOSFET switching. The
overcurrent function will trip at a peak inductor current
(IPEAK) determined by:
IPEAK
=
I---O----C----S----E----T-----×-----R----O-----C----S----E---T--
rDS(ON)
The OC trip point varies with MOSFETs rDS(ON)
temperature variations. To avoid overcurrent tripping in the
normal operating load range, determine 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.
OVERCURRENT TRIP:
VDS > VSET
iD × rDS(ON) > IOCSET × ROCSET
OCSET
VIN = +5V
ROCSET
IOCSET
40µA
DRIVE
VSET +
VCC
UGATE
iD
+
VDS(ON)
OC +
-
OCC
PWM
GATE
CONTROL
PHASE
VPHASE = VIN VDS
VOCSET = VIN VSET
FIGURE 2. OVERCURRENT DETECTION
For an equation for the ripple current see the section under
component guidelines titled Output Inductor Selection.
+3.3VIN
VOUT3
+
COUT3
Q4 DRIVE3
FB3
RS3
RP3
VOUT4
Q5
+
COUT4
DRIVE4
RS4 FB4
RP4
ISL6432
VOUT
=
0.8
×
1
+
R-R----SP--
FIGURE 3. ADJUSTING THE OUTPUT VOLTAGE OF ANY OF
THE FOUR REGULATORS (OUTPUTS 3 AND 4
PICTURED)
Output Voltage Selection
The output voltage of the PWM converter can be resistor-
programmed to any level between VIN and 0.8V. However,
since the value of RS1 is affecting the values of the rest of
the compensation components, it is advisable its value is
kept between 2kand 5k.
All linear regulatorsoutput voltages are set by means of
external resistor dividers as shown in Figure 3. The two
resistors used to set the voltage on each of the three linear
regulators have to meet the following criteria: their value
while in a parallel connection has to be less than 5k, or
otherwise said, the following relationship has to be met:
-R----S-----×-----R-----P- < 5 k
RS + RP
6

6 Page



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部品番号部品説明メーカ
ISL6432EVAL1

PWM and Triple Linear Power Controller for Home Gateway Applications

Intersil Corporation
Intersil Corporation


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