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RC5037 Schematic ( Datenblatt PDF ) - Fairchild Semiconductor

Teilenummer RC5037
Beschreibung Adjustable Switching Regulator Controller
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 

Gesamt 12 Seiten
		
RC5037 Datasheet, Funktion
www.fairchildsemi.com
RC5037
Adjustable Switching Regulator Controller
Features
• High power switch-mode DC-DC controller can provide
in excess of 13A
• Output voltage adjustable from 1.5V to 3.6V
• 85% efficiency
• Cumulative accuracy < 3% over line, load, and
temperature variations
• Overvoltage and short circuit protection
• Built-in soft start
Applications
• I/O and AGP power for desktop computers
• High efficiency power for ASICs
• High efficiency power for DSPs
• Adjustable step-down power supplies
Description
The RC5037 is a high power, switch-mode DC-DC controller
that provides efficient power for all low-voltage applications.
This controller has a built-in Soft Start feature which offers
system protection during power-up by reducing both inrush
current and output overshoot. When combined with the
appropriate external circuitry, the RC5037 can deliver load
currents as high as 13A at efficiencies as high as 88%. The
RC5037 can generate output voltages from 1.5V up to 3.6V
using external resistors.
The RC5037 is designed to operate in a constant on-time
control mode under all load conditions. Its accurate low TC
reference eliminates the need for precision external compo-
nents in order to achieve the tight tolerance voltage regula-
tion required by many applications. Short circuit current
protection is provided through the use of a current sense
resistor, while overvoltage protection is provided internally.
Block Diagram
RC5037
Oscillator
1
1.5V
Reference
5V
2
Feedback Control
Digital Logic
6
+12V +5V
4
3
8
7
5
Vout
REV. 1.0.1






RC5037 Datasheet, Funktion
RC5037
Table1. Bill of Materials for a RC5037 3.3V, 13A Application
Qty. Reference
Manufacturer
Part Order #
Description
3 C1, C7-8 Any
100nF, 25V Capacitor
3 C2-4
Sanyo
10MV1200GX
1200µF, 10V Aluminum Capacitor
1 C5
1 C6
6 C9-14
Any
Any
Sanyo
6MV1500GX
1µF, 25V Capacitor
180pF, 50V Capacitor
1500µF, 6.3V Aluminum Capacitor
1 R1
1 R2
Any
Any
47.5
4.75
1 R3
N/A
5.2m, 1W Resistor
1 R4
1 R5
1 D1
1 D2
1 D3
1 Q1
Optional L1
1 L2
1 U1
Any
Any
Motorola
MBRB1545CT
Fairchild
MMBD4148
Motorola
1N4735A
Fairchild
FDB6030L
Any
Any
Fairchild
RC5037M
2.43K
2K
15A, 45V Schottky
Signal Diode
6.2V Zener
30V, 14mLogic Level MOSFET
2.5µH Inductor
4.7µH Inductor
PWM Controller
PRODUCT SPECIFICATION
Requirements
and Comments
IRMS = 2A , See Equation
(2) in Applications
C0G
ESR = 44m
PCB Trace Resistor, see
Eauation (3) Applications
ISAT > 8A
ISAT > 13A
Application Information
The RC5037 contains a precision trimmed zero TC voltage
reference, a constant-on-time architecture controller, a high
current output driver, and a low offset error amp. The
detailed block diagram in Figure 1 shows how the RC5037
works together with external components to achieve a high-
performance switching power supply.
Switch-Mode Control Loop
The main control loop for the switch-mode converter consists
of a current conditioning amplifier and a voltage conditioning
amplifier. The voltage amplifier compares the voltage from the
internal reference with the converter’s output voltage divided
by an external resistor divider. The current amplifier senses the
current by comparing the voltages at the IFBH and IFBL pins,
which are attached to either side of the current sense resistor.
The signals from the voltage and current amplifiers are
summed together, the result being used to control the off-time
of the oscillator. The current feedback signal is also used as
part of the RC5037 short-circuit protection.
High Current Output Drivers
The RC5037 high current output driver (DRV) contains high
speed bipolar power transistors configured in a push-pull
configuration. The output driver is capable of supplying 0.5A
of current in less than 100ns. The driver’s power and ground
are separated from the overall chip power and ground for
added switching noise immunity.
Internal Reference
The reference in the RC5037 is a precision band-gap type
reference. Its temperature coefficient is trimmed to provide a
near zero TC.
Constant-On-Time Oscillator
The RC5037 switch-mode oscillator is designed as a fixed
on-time, variable off-time oscillator. The constant-on-time
oscillator consists of a comparator, an external capacitor, a
fixed current source, a variable current source, and an analog
switch that selects between two threshold voltages for the
comparator. The external timing capacitor is alternately
6

6 Page







RC5037 pdf, datenblatt
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
ACEx™
CoolFET™
CROSSVOLT™
E2CMOSTM
FACT™
FACT Quiet Series™
FAST®
FASTr™
GTO™
HiSeC™
ISOPLANAR™
MICROWIRE™
POP™
PowerTrench
QFET™
QS™
Quiet Series™
SuperSOT™-3
SuperSOT™-6
SuperSOT™-8
SyncFET™
TinyLogic™
UHC™
VCX™
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER
NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD
DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT
OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT
RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or
2. A critical component is any component of a life
systems which, (a) are intended for surgical implant into
support device or system whose failure to perform can
the body, or (b) support or sustain life, or (c) whose
be reasonably expected to cause the failure of the life
failure to perform when properly used in accordance
support device or system, or to affect its safety or
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
effectiveness.
user.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Advance Information
Preliminary
Product Status
Formative or
In Design
First Production
No Identification Needed
Full Production
Definition
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Obsolete
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. D

12 Page


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