数据搜索系统,热门电子元器件搜索
  Chinese  ▼
ALLDATASHEETCN.COM

X  

RC5061 数据表(PDF) 12 Page - Fairchild Semiconductor

部件名 RC5061
功能描述  High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  FAIRCHILD [Fairchild Semiconductor]
网页  http://www.fairchildsemi.com
标志 FAIRCHILD - Fairchild Semiconductor

RC5061 数据表(HTML) 12 Page - Fairchild Semiconductor

Back Button RC5061 Datasheet HTML 8Page - Fairchild Semiconductor RC5061 Datasheet HTML 9Page - Fairchild Semiconductor RC5061 Datasheet HTML 10Page - Fairchild Semiconductor RC5061 Datasheet HTML 11Page - Fairchild Semiconductor RC5061 Datasheet HTML 12Page - Fairchild Semiconductor RC5061 Datasheet HTML 13Page - Fairchild Semiconductor RC5061 Datasheet HTML 14Page - Fairchild Semiconductor RC5061 Datasheet HTML 15Page - Fairchild Semiconductor RC5061 Datasheet HTML 16Page - Fairchild Semiconductor Next Button
Zoom Inzoom in Zoom Outzoom out
 12 / 18 page
background image
RC5061
PRODUCT SPECIFICATION
12
REV. 1.0.0 7/6/00
Test Parameters
Figure 3. Ouput Drive Timing Diagram
Application Information
The RC5061 Controller
The RC5061 is a programmable synchronous DC-DC con-
troller IC. When designed around the appropriate external
components, the RC5061 can be configured to deliver more
than 16A of output current, as appropriate for the Katmai and
Coppermine and other processors. The RC5061 functions as
a fixed frequency PWM step down regulator.
Main Control Loop
Refer to the RC5061 Block Diagram on page 1. The RC5061
implements “summing mode control”, which is different from
both classical voltage-mode and current-mode control. It
provides superior performance to either by allowing a large
converter bandwidth over a wide range of output loads.
The control loop of the regulator contains two main sections:
the analog control block and the digital control block. The
analog section consists of signal conditioning amplifiers feeding
into a comparator which provides the input to the digital control
block. The signal conditioning section accepts input from the
DROOP (current feedback) and VFB (voltage feedback) pins
and sets up two controlling signal paths. The first, the voltage
control path, amplifies the difference between the VFB signal
and the reference voltage from the DAC and presents the
output to one of the summing amplifier inputs. The second,
current control path, takes the difference between the DROOP
and SW pins when the high-side MOSFET is on, reproducing
the voltage across the MOSFET and thus the input current; it
presents the resulting signal to another input of the summing
amplifier. These two signals are then summed together. This
output is then presented to a comparator looking at the oscillator
ramp, which provides the main PWM control signal to the
digital control block.
The digital control block takes the analog comparator input
and the main clock signal from the oscillator to provide the
appropriate pulses to the HIDRV and LODRV output pins.
These two outputs control the external power MOSFETs.
There is an additional comparator in the analog control section
whose function is to set the point at which the RC5061 current
limit comparator disables the output drive signals to the
external power MOSFETs.
High Current Output Drivers
The RC5061 contains two identical high current output drivers
that utilize high speed bipolar transistors in a push-pull config-
uration. The drivers’ power and ground are separated from
the chip’s power and ground for switching noise immunity.
The power supply pin, VCCP, is supplied from an external
12V source through a series 33
Ω resistor. The resulting volt-
age is sufficient to provide the gate to source drive to the
external MOSFETs required in order to achieve a low RDS,ON.
Internal Voltage Reference
The reference included in the RC5061 is a precision band-gap
voltage reference. Its internal resistors are precisely trimmed
to provide a near zero temperature coefficient (TC). Based on
the reference is the output from an integrated 5-bit DAC. The
DAC monitors the 5 voltage identification pins, VID0-4. When
the VID4 pin is at logic HIGH, the DAC scales the reference
voltage from 2.0V to 3.5V in 100mV increments. When VID4
is pulled LOW, the DAC scales the reference from 1.30V to
2.05V in 50mV increments. All VID codes are available, includ-
ing those below 1.80V.
Power Good (PWRGD)
The RC5061 Power Good function is designed in accordance
with the Pentium III DC-DC converter specifications and
provides a continuous voltage monitor on the VFB pin. The
circuit compares the VFB signal to the VREF voltage and
outputs an active-low interrupt signal to the CPU should the
power supply voltage deviate more than ±12% of its nominal
setpoint. The Power Good flag provides no other control
function to the RC5061.
Output Enable/Soft Start (ENABLE/SS)
The RC5061 will accept an open collector/TTL signal for
controlling the output voltage. The low state disables the output
voltage. When disabled, the PWRGD output is in the low state.
Even if an enable is not required in the circuit, this pin should
have attached a capacitor (typically 100nF) to softstart the
switching. A larger value may occasionally be required if the
converter has a very large capacitor at its output.
Over-Voltage Protection
The RC5061 constantly monitors the output voltage for protec-
tion against over-voltage conditions. If the voltage at the VFB
pin exceeds the selected program voltage, an over-voltage
condition is assumed and the RC5061 disables the output
drive signal to the external high-side MOSFET. The DC-DC
converter returns to normal operation after the output voltage
returns to normal levels.
Oscillator
The RC5061 oscillator section uses a fixed frequency of
operation of 300KHz.
tR
5V
tDT
tDT
tF
HIDRV
to SW
LODRV
2V
2V
2V
5V
2V


类似零件编号 - RC5061

制造商部件名数据表功能描述
logo
Fairchild Semiconductor
RC5060 FAIRCHILD-RC5060 Datasheet
136Kb / 15P
   ACPI Switch Controller
logo
Soshin electric Co., Lt...
RC5060 SOSHIN-RC5060 Datasheet
151Kb / 2P
   Ferrite core with metal fitting for installation
RC5060Y SOSHIN-RC5060Y Datasheet
79Kb / 1P
   High permeability Ring core
RC5060ZZ SOSHIN-RC5060ZZ Datasheet
135Kb / 3P
   Ferrite core with metal fitting for installation
More results

类似说明 - RC5061

制造商部件名数据表功能描述
logo
Fairchild Semiconductor
FAN5059MX FAIRCHILD-FAN5059MX Datasheet
216Kb / 18P
   High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
FAN5071 FAIRCHILD-FAN5071 Datasheet
424Kb / 15P
   High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
FAN5056MV85 FAIRCHILD-FAN5056MV85 Datasheet
162Kb / 15P
   High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
RC5058 FAIRCHILD-RC5058 Datasheet
257Kb / 18P
   High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms
FAN5070 FAIRCHILD-FAN5070 Datasheet
147Kb / 14P
   High Performance Programmable Synchronous DC-DC Controller
RC5052 FAIRCHILD-RC5052 Datasheet
157Kb / 18P
   High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors
RC5057 FAIRCHILD-RC5057 Datasheet
177Kb / 20P
   High Performance Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors
RC5051 FAIRCHILD-RC5051 Datasheet
141Kb / 16P
   Programmable Synchronous DC-DC Controller for Low Voltage Microprocessors
RC5054A FAIRCHILD-RC5054A Datasheet
122Kb / 13P
   Programmable Synchronous DC-DC Converter Controller for Low Voltage Microprocessors
logo
Semtech Corporation
SC1158 SEMTECH-SC1158 Datasheet
71Kb / 5P
   PROGRAMMABLE SYNCHRONOUS DC/DC CONTROLLER FOR ADVANCED PROCESSORS
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


数据表 下载

Go To PDF Page


链接网址




隐私政策
ALLDATASHEETCN.COM
ALLDATASHEET是否为您带来帮助?  [ DONATE ] 

关于 Alldatasheet   |   广告服务   |   联系我们   |   隐私政策   |   链接交换   |   制造商名单
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com