參數(shù)資料
型號(hào): IR3623MPBF
廠商: International Rectifier
英文描述: HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING
中文描述: 高頻2相,單或雙輸出同步降壓控制器,輸出跟蹤和排序
文件頁(yè)數(shù): 9/26頁(yè)
文件大小: 523K
代理商: IR3623MPBF
IR3623MPbF
www.irf.com
Circuit Description
THEORY OF OPEARTION
Introduction
The IR3623 is a versatile device for high
performance buck converters. It consists of two
synchronous buck controllers which can be
operated either in two independent outputs mode
or in current share single output mode for high
current applications.
The timing of the IC is provided by an internal
oscillator circuit which generates two-180
o
-out-of-
phase clock that can be externally programmed
up to 1200kHz per phase.
The IR3623 along with IR’s IP2003A family offers
a compact and efficient solution where the
integration and power density are required.
9
Under-Voltage Lockout
The under-voltage lockout circuit monitors three
signals (Vcc, Enable and 5V_sns). This ensures
the correct operation of the converter during
power up and power down sequence. The PWM
outputs remain in the off state whenever one of
these signals drop below set thresholds. Normal
operation resumes once these signals rise above
the set values. Figure 3 shows a typical start up
sequence.
5V_sns
IR3623 integrates an internal LDO for powering
the external module without need for an external
supply. For a correct start up sequence the
external module needs to be biased first prior to
the controller IC. The V
out3
ramps up as soon as
Vcc is applied but the POR (Power On Ready) is
not enabled until the V
out3
reached the 5V
threshold set by 5V_sns pin.
Enable
The enable features another level of flexibility for
start up. The Enable has precise threshold which
is internally monitored by under-voltage lockout
circuit.
It’s threshold can be externally programmed to
desired level by using two external resistors, so
the converter doesn’t start up until the input
voltage is sufficiently high.
Vcc
5.2V
Vout3
5V_sns
Enable
Vbus
4.7V
8.0V
11V
12V
12V
SS
3V
Enable OK (IC's POR)
V
out3
OK
V
OK
Seq
Fig. 3: Normal Start up, Enable threshold is externally set to 11V
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