參數(shù)資料
型號: IR3637SPBF
廠商: International Rectifier
英文描述: 1% ACCURATE SYNCHRONOUS PWM CONTROLLER
中文描述: 1%準(zhǔn)確的同步PWM控制器
文件頁數(shù): 4/21頁
文件大小: 655K
代理商: IR3637SPBF
4
Rev.1.1
06/16/05
IR3637SPBF
www.irf.com
BLOCK DIAGRAM
Figure 2 - Simplified block diagram of the IR3637.
25uA
64uA Max
POR
Oscillator
Error Amp
Ct
Error Comp
Reset Dom
POR
0.4V
FbLo Comp
3
Vc
HDrv
Vcc
LDrv
Gnd
Vcc
4.2V
Vc
3.3V
Bias
Generator
3V
0.8V
POR
8
SS/SD
Fb
1
Comp 7
25K
25K
0.8V
3V
2
6
5
R
S
Q
4
Short-Circuit Protection
The output is protected against the short-circuit. The
IR3637 protects the circuit for shorted output by sens-
ing the output voltage (through the external resistor di-
vider). The IR3637 shuts down the PWM signals, when
the output voltage drops below 0.4V.
Under-Voltage Lockout
The under-voltage lockout circuit assures that the
MOSFET driver outputs remain in the off state whenever
the supply voltage drops below set parameters. Lockout
occurs if Vc or Vcc fall below 3.3V and 4.2V respec-
tively. Normal operation resumes once Vc and Vcc rise
above the set values.
Shutdown
The converter can be shutdown by pulling the soft-start
pin below 0.4V. This can be easily done by using an
external small signal transistor. During shutdown the con-
trol MOSFET driver is turned off and the synchronous
MOSFET driver is turned on.
Introduction
The IR3637 is a fixed frequency, voltage mode synchro-
nous controller and consists of a precision reference
voltage, an error amplifier, an internal oscillator, a PWM
comparator, 0.5A peak gate driver, soft-start and shut-
down circuits (see Block Diagram).
The output voltage of the synchronous converter is set
and controlled by the output of the error amplifier; this is
the amplified error signal from the sensed output voltage
and the reference voltage.
This voltage is compared to a fixed frequency linear
sawtooth ramp and generates fixed frequency pulses of
variable duty-cycle, which drives the two N-channel ex-
ternal MOSFETs.The timing of the IC is provided through
an internal oscillator circuit which uses on-chip capaci-
tor to set the oscillation frequency to 400kHz.
THEORY OF OPERATION
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