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参数资料
| 型号： | ILC6360 |
| 厂商： | Impala Linear Corporation |
| 元件分类： | DC/DC变换器 |
| 英文描述： | STEP-UP/STEP DOWN DC-DC CONVERTER FOR 1-CELL LITHIUM-LON BATTERIES |
| 中文描述： | STEP-UP/STEP向下的DC - DC转换器，用于1节锂离子电池 |
| 文件页数： | 5/14页 |
| 文件大小： | 687K |
| 代理商： | ILC6360 |
Step-Up/Step-Down DC-DC Converter for 1-Cell Lithium-Ion Batteries
Impala Linear Corporation
5
(408) 574-3939
www.impalalinear.com
Jan 1999
ILC6360 1.1
The ILC6360 performs both buck and boost DC-DC con-
version by controlling the switch element as shown in the
simplified circuit in figure 1 below.
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 capacitor and load. As this
on and off switching continues, the output capacitor voltage
builds up due to the charge it is storing from the inductor
current. The output voltage is therefore boosted relative to
the input.
In general, the switching characteristic is determined by the
output voltage desired and the current required by the load.
Specifically the energy transfer is determined by the power
stored in the coil during each switching cycle.
P
L
= (t
ON
, V
IN
)
Synchronous Rectification
The ILC6360 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 (SW2) or in the case of the ILC6360, a FET as
shown in figure 2 below.
The two switches now open and close in opposition to each
other, directing the flow of current to either charge the
inductor or to feed the load. The ILC6360 monitors the volt-
age on the output capacitor to determine how much and
how often to drive the switches.
Modes of Operation
There are four modes of operation for the ILC6360
buck/boost DC-DC converter. These four modes are inter-
nally selected by the regulator depending on external con-
ditions such as line voltage, output voltage, load current,
inductor size, output capacitor size and resistive losses.
The first mode is the discontinuous mode. If the load is light
and the inductor value is small enough, the inductor will
transfer all of its energy to the output capacitor before a
cycle is completed. The input current waveform instead of
being continuous with a triangle ripple, will be a series of
discrete triangle shaped pulses as the inductor charges
from the input and discharges into the capacitor. The ripple
on the output capacitor becomes larger than expected com-
pared to continuous mode calculation because of the cur-
rent spikes from the input.
Boost (Step-up) Operation
The second mode is the conventional boost (step-up) mode
of operation. The input current is a smooth waveform with a
triangular ripple current. The output waveform exhibits rip-
ple caused by the charging and discharging of the output
capacitor and the current flowing through the capacitor’s
equivalent series resistance (ESR).
The third mode is the PFM mode. If the output voltage
exceeds an upper limit, for whatever reason, the regulator
enters the PFM mode. The regulator shuts down for one or
more cycles until the output voltage drops below a pre-set
threshold and one cycle is initiated. The inductor current falls
to zero during the off time. The basic cycle is the 3.3mS
PWM cycle but one or more cycles are dropped from the
pulse train (also called pulse skipping). This may be in
response to a light load condition or from a fast transient
load condition where the output capacitor charges too high
during load turn-off. In light load conditions, PFM mode
offers high efficiency due to significantly lower quiescent cur-
rent for the regulator. The output voltage will be a few tens
of millivolts higher in the PFM mode than in the PWM mode.
The fourth mode of operation is the buck (step-down) mode
and is described below.
Buck (Step-down) Operation
The “buck” mode is not a true switching regulator mode but
allows the regulator to operate when the input voltage
exceeds the output voltage. Once the input voltage exceeds
the output voltage, the regulator is not capable of limiting
the current in a non-dissipative fashion.
Fig. 1: Basic Circuit
V
OUT
POK
LBO
LB/SD
SYNC
GND
L
X
V
IN
ILC6360
PWM/PFM
CONTROLLER
SHUTDOWN
CONTROL
V
REF
DELAY
+
+
-
-
SW2
SW1
Fig. 2: Simplified ILC6360 block diagram
APPLICATIONS INFORMATION
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ILC6360CIR-36 | 制造商:IMPALA 制造商全称:IMPALA 功能描述:STEP-UP/STEP DOWN DC-DC CONVERTER FOR 1-CELL LITHIUM-LON BATTERIES |
| ILC6360CIR-ADJ | 制造商:IMPALA 制造商全称:IMPALA 功能描述:STEP-UP/STEP DOWN DC-DC CONVERTER FOR 1-CELL LITHIUM-LON BATTERIES |
| ILC6363 | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Step-Up DC-DC Converter for One-Cell Lithium-Ion Batteries |
| ILC6363CIR33X | 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 |
| ILC6363CIR50X | 功能描述:直流/直流开关调节器 Step-Up/Step Down DC-DC RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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