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参数资料
| 型号： | IRDC3637 |
| 厂商： | International Rectifier |
| 文件页数： | 4/21页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL SYNC BUCK REGULATOR |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 7A |
| 输入电压： | 4.5 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 400kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | IR3637 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 相关产品： | IR3637ASTRPBFTR-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637ASPBF-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637STRPBFDKR-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637STRPBFCT-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637STRPBFTR-ND - IC REG CTRLR BUCK PWM VM 8-SOIC IR3637SPBF-ND - IC REG CTRLR BUCK PWM VM 8-SOIC |
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 |
|---|---|
| IRDC3637EVAL | 制造商:IRF 制造商全称:International Rectifier 功能描述:IR3637 EVALUATION BOARD USER GUIDE |
| IRDC3640 | 功能描述:电源管理IC开发工具 IR3640 12V PWM 1.5MHz Controller RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3651 | 功能描述:电源管理IC开发工具 IR3651 EVAL BRD 400kHz RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3710-DF | 功能描述:电源管理IC开发工具 1 PHASE SYNC-BUCK PWM CTRLLER IC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| IRDC3710-QFN | 功能描述:电源管理IC开发工具 1 PHASE SYNC-BUCK PWM CTRLLER IC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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