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參數(shù)資料
| 型號(hào)： | FAN5038 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Dual Voltage Controller for DSP Power |
| 中文描述： | 雙電壓控制器的DSP電源 |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大?。?/td> | 84K |
| 代理商： | FAN5038 |
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FAN5038
PRODUCT SPECIFICATION
9
REV. 1.0.2 7/6/00
Linear Control Loop
The low-offset op-amp is configured to be the controlling
element in a precision low-drop-out linear regulator. As can
be seen from Figure 2, the op-amp is used to compare the
divided down output of the linear regulator to the precision
reference. The error signal is used to control either an
N-channel MOSFET or a power NPN transistor.
High Current Output Drivers
The FAN5038 switching high current output driver (SDRV)
contains high speed bipolar power transistors configured in a
push-pull configuration. The output driver is capable of sup-
plying 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 FAN5038 is a precision band-gap type
reference. Its temperature coefficient is trimmed to provide a
near zero TC. For guaranteed stable operation under all condi-
tions, a 0.1μF capacitor is recommended on the VREF output
pin. No load may be attached to this pin.
Constant-On-Time Oscillator
The FAN5038 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
charged and discharged through the enabling and disabling
of the fixed current source. The variable current source is
controlled from the error inputs that are received from the
current and voltage feedback signals. The oscillator off-time
is controlled by the amount of current that is available from
the variable current source to charge the external capacitor up
to the high threshold level of the comparator. The on-time is
set be the constant current source that discharges the external
capacitor voltage down to the lower comparator threshold.
Using SWCTRL and LIN_EN
When the SWCTRL pin is HIGH, the switching regulator
will set its output at 3.5V using two internal precision resis-
tors. When this pin is LOW, the switching regulator output
can be set to any voltage between 1.5V and 3.6V using exter-
nal precision resistors. The LIN_EN pin is used to enable or
disable the linear regulator. When the LIN_EN pin is HIGH,
the linear regulator will be disabled. If this pin is LOW, the
linear regulator output can be set from 1.5V to 3.5V using
external precision resistors.
Power Sequencing
The linear regulator output can be sequenced with the circuit
shown in Figure 1. The combination R4 = 100K
and
CS = 1μF sets a delay of approximately 25 msec. Diode D2
prevents core voltage from exceeding I/O voltage, so that I/O
tracks core until after the delay.
Figure 2. FAN5038 Block Diagram
LINEAR
ENABLE
SWITCHER
SELECT
I
O
I
ON
CONSTANT ON-TIME
OSCILLATOR
FAN5038
gm
gm
V
H
V
L
ANALOG
SWITCH
–
+
V
CORE
V
I/O
+5V
VREF
gm
SWCTRL
LIN_EN
+12V
+12V
REF
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| FAN5038M | Current-Mode SMPS Controller |
| FAN5056MV85 | High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5038M | 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC Dual Volt Controller DSP Power RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| FAN5038MX | 功能描述:數(shù)字信號(hào)處理器和控制器 - DSP, DSC Dual Volt Controller DSP Power RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時(shí)鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時(shí)器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| FAN503MTCX | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5056MV85 | 功能描述:DC/DC 開關(guān)控制器 SOIC-WIDE-24 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| FAN5056MV85X | 功能描述:DC/DC 開關(guān)控制器 SOIC-WIDE-24 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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