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参数资料
| 型号： | IR3637STRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 4/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 1 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 85% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 标准包装 |
| 配用： | IRPP3637-12A-ND - KIT REF DES 12A 1PH SYNC BUCK IRDC3637-ND - BOARD EVAL SYNC BUCK REGULATOR |
| 其它名称： | IR3637STRPBFDKR |
IR3637SPBF
BLOCK DIAGRAM
SS/SD 8
3V
25uA
64uA Max
Vcc
4.2V
Vc
3.3V
Bias
Generator
3V
0.8V
POR
6 Vc
POR
Ct
Oscillator
S
5 HDrv
0.8V
Error Comp
Q
25K
Error Amp
R
2 Vcc
Fb 1
Comp 7
25K
0.4V
FbLo Comp
Reset Dom
3 LDrv
4 Gnd
POR
Figure 2 - Simplified block diagram of the IR3637.
THEORY OF OPERATION
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.
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.
4
www.irf.com
Rev.1.1
06/16/05
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相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3638 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:High Frequency Synchronous |
| IR3638DR2G | 制造商:ON Semiconductor 功能描述: |
| IR3638SPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER FOR TRACKING APPLIACTIONS |
| IR3638STRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 400kHz 0.6V Track RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| IR3640MPBF | 功能描述:IC REG CTRLR BUCK PWM VM 20-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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