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参数资料
| 型号： | ILC6363CIR50X |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Step-Up DC-DC Converter for One-Cell Lithium-Ion Batteries |
| 中文描述： | 1 A BATTERY CHARGE CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | MSOP-8 |
| 文件页数： | 5/14页 |
| 文件大小： | 158K |
| 代理商： | ILC6363CIR50X |
PRODUCT SPECIFICATION
ILC6363
REV. 1.3.5 5/21/02
5
Application Information
The ILC6363 performs boost DC-DC conversion by control-
ling the switch element as shown in the simplified circuit in
Figure 3 below.
Figure 3. Basic Boost Circuit
When the switch is closed, current is built up through the
inductor. When the switch opens, this current is forced
through the diode to the output. As this on and off switching
continues, the output capacitor voltage builds up due to the
charge it is storing from the inductor current. In this way, the
output voltage is boosted relative to the input.
In general, the switching characteristic is determined by the
output voltage desired and the current required by the load.
The energy transfer is determined by the power stored in the
coil during each switching cycle.
P
L
= (t
ON
, V
IN
)
Synchronous Recti
fi
cation
The ILC6363 also uses a technique called “synchronous
rectification” which removes the need for the external diode
used in other circuits. The diode is replaced with a second
switch or in the case of the ILC6363, an FET as shown in
Figure 4 below.
Figure 4. Simplified ILC6383 block diagram
The two switches now open and close in opposition to each
other, directing the flow of current to either charge the induc-
tor or to feed the load. The ILC6363 monitors the voltage on
the output capacitor to determine how much and how often
to drive the switches.
PWM Mode Operation
The ILC6363 uses a PWM or Pulse Width Modulation
technique. The switches are constantly driven at typically
300kHz. The control circuitry varies the power being
delivered to the load by varying the on-time, or duty cycle,
of the switch SW1 (see Figure 5). Since more on-time
translates to higher current build-up in the inductor, the
maximum duty cycle of the switch determines the maximum
load current that the device can support. The minimum value
of the duty cycle determines the minimum load current that
can maintain the output voltage within specified values.
There are two key advantages of the PWM type controllers.
First, because the controller automatically varies the duty
cycle of the switch's on-time in response to changing load
conditions, the PWM controller will always have an opti-
mized waveform for a steady-state load. This translates to
very good efficiency at high currents and minimal ripple on
the output. Ripple is due to the output cap constantly accept-
ing and storing the charge received from the inductor, and
delivering charge as required by the load. The “pumping”
action of the switch produces a sawtooth-shaped voltage as
seen by the output.
The other key advantage of the PWM type controllers over
pulse frequency modulated (PFM) types is that the radiated
noise due to the switching transients will always occur at
(fixed) switching frequency. Many applications do not care
much about switching noise, but certain types of applica-
tions, especially communication equipment, need to mini-
mize the high frequency interference within their system as
much as possible. Use of the PWM converter in those cases
is desirable.
PFM Mode Operation
For light loads the ILC6363 can be switched to PFM. This
technique conserves power by only switching the output if
the current drain requires it. As shown in the Figure 5, the
waveform actually skips pulses depending on the power
needed by the output. This technique is also called “pulse
skipping” because of this characteristic.
In the ILC6363, the switchover from PWM to PFM mode is
determined by the user to improve efficiency and conserve
power.
The Dual PWM/PFM mode architecture was designed spe-
cifically for applications such as wireless communications,
which need the spectral predictability of a PWM-type
DC-DC converter, yet also need the highest efficiencies
possible, especially in Standby mode.
V
OUT
POK
LBO
LB/SD
SEL
GND
L
X
V
IN
ILC6363
PWM/PFM
CONTROLLER
SHUTDOWN
CONTROL
V
REF
DELAY
+
+
-
-
SW1
SW2
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ILC6363CIR50X_Q | 功能描述:DC/DC 开关控制器 Step-Up/Step Down DC-DC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ILC6363CIRADJX | 功能描述:开关变换器、稳压器与控制器 DC/DC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| ILC6363CIRADJX_Q | 功能描述:DC/DC 开关控制器 DC/DC RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ILC6370 | 制造商:IMPALA 制造商全称:IMPALA 功能描述:SOT-89 STEP UP SWITCHING REGULATOR WITH SHUTDOWN |
| ILC6370AP-25 | 制造商:IMPALA 制造商全称:IMPALA 功能描述:SOT-89 STEP UP SWITCHING REGULATOR WITH SHUTDOWN |
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