KIT34717EPEVBE【PDF 16/28 页】KIT EVAL BOARD 5A 1.0MHZ

您好，
买卖IC网欢迎您。
请登录
免费注册

12页 13页 14页 15页 [16页]17页 18页 19页 20页

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

FUNCTIONAL DEVICE OPERATION

OPERATIONAL MODES

SD = 0

V IN < 3.0 V

V OUT2 <=V UVF2

V OUT2

Under-voltage

V OUT1 =ON

V OUT2 =ON

PG = 1

V OUT2 >=V OVR2

V OUT2 =>=V UVR2

V OUT2

Over-voltage

Shutdown

F SW is programmed

V OUT1 = Discharge

V OUT2 = Discharge

PG = 1

SD =1

Power Off

V OUT1 =OFF

V OUT2 =OFF

PG = 1

3.0 V<=V IN <=6.0 V

V OUT1 <=V OUT1

V OUT1

Under-voltage

V OUT1 =ON

V OUT2 =ON

PG = 1

V OUT1 >= V UVR1

V OUT1 >=V OVR1

V OUT2 <=V OVF2

V OUT1 <= V OVF1

T J >=170°C

T IMEOUT Expired

T IMEOUT

I OUT1 >=I LIM1

V OUT1 =ON

V OUT2 =ON

PG = 1

T J >= 170°C T J <=145°C

Channel 2 T IMEOUT Expired

Thermal Shutdown

V OUT1 =ON

V OUT2 =OFF

PG = 1

T IMEOUT

Expired

Channel 2

Over-current

V OUT1 =ON

V OUT2 =OFF

PG = 1

TIMEOUT=1

I OUT2 >=I LIM2

For>=10 ms

Normal

F SW is programmed

I LM1 , I LM2 are programmed

V OUT1 and V OUT2 t ss = 1

V OUT1 = ON

V OUT2 = ON

PG = 0

T IMEOUT T IMEOUT

Expired Expired

V OUT2 V OUT1

Short-circuit Short-circuit

V OUT1 =ON V OUT1 =OFF

V OUT2 =OFF V OUT2 =ON

PG = 1 PG = 1

TIMEOUT=1 TIMEOUT=1

I OUT1 >=I SHORT1

I OUT2 >=I SHORT2

Figure 5. Operation Modes Diagram

V OUT1

Over-voltage

V OUT1 =ON

V OUT2 =ON

PG = 1

T J <=145°C

Channel 1

Thermal Shutdown

V OUT1 =OFF

V OUT2 =ON

Expired PG = 1

Channel 1

Over-current

V OUT1 =OFF

V OUT2 =ON

PG = 1

TIMEOUT=1

For>=10 ms

MODES OF OPERATION

The 34717 has two primary modes of operation:

Normal Mode

In Normal mode, all functions and outputs are fully

operational. To be in this mode, the V IN needs to be within its

operating range, Shutdown input is high, and no faults are

present. This mode consumes the most amount of power.

Shutdown Mode

In this mode, activated by pulling the SD pin low, the chip

is in a shutdown state and the output is disabled and

discharged. In this mode, the 34717 consumes the least

amount of power since almost all of the internal blocks are

disabled.

START-UP SEQUENCE

When power is first applied, the 34717 checks the status

of the SD pin. If the device is in a shutdown mode, no block

will power up and the output will not attempt to ramp. Once

the SD pin is set to high, the V DDI internal supply voltage and

the bias currents will be established, so the internal V DDI POR

signal can be released. The rest of the internal blocks will be

enabled and the buck converter switching frequency and soft

start timing values are determined by reading the FREQ,

ILIM1, and ILIM2 pins. A soft start cycle is then initiated to

ramp up the output of the buck converter. The first channel

uses an internal 0.7 V reference for its error amplifier while

the second channel’s error amplifier uses the voltage on the

VREFIN pin as its reference voltage until V REFIN is equal to

0.7 V, then the error amplifier defaults to the internal 0.7 V

reference voltage. This method allows the second output to

achieve multiple tracking configurations as will be explained

later in this document.

Soft start is used to prevent the output voltage from

overshooting during startup. At initial startup, the output

capacitor is at zero volts; V OUT = 0 V. Therefore, the voltage

across the inductor will be PV IN during the capacitor charge

phase which will create a very sharp di/dt ramp. Allowing the

inductor current to rise too high can result in a large

difference between the charging current and the actual load

34717

Analog Integrated Circuit Device Data

16

Freescale Semiconductor

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

我的联系方式

*

*

*

相关PDF资料

KS-1787-MG SHELF SLIDING KEYBOARD ASSEMBLY

KS-1788 SHELF SLIDING KEYBOARD ASSEMBLY

KSDKSTM32-PL KIT IAR KICKSTART STM32 CORTEXM3

LC4064ZC-EV BOARD EVAL FOR ISPMACH 4064ZC

LCMXO2280C-C-EVN BOARD CONTROL EVAL MACHXO

LDB100-024SW LED POWER SUPPLY 24V 0-4A 100W

LDB150-048SW LED POWER SUPPLY 24V-48V 3.125A

LDB200-048SW LED POWER SUPPLY 24V-48V 4.2A

相关代理商/技术参数

KIT34727FCEVBE 功能描述:电源管理IC开发工具 600MA HIGH EFFICIENCY LO 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

KIT34825EPEVME 功能描述:界面开发工具 MICRO USB INTERFACE IC RoHS:否制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V

KIT34844AEPEVBE 功能描述:LED 照明开发工具 IC, 10 CHANNEL LED BACKLIGHT RoHS:否制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:

KIT34844EPEVME 功能描述:LED 照明开发工具 MC34844 10-Ch LED BL Driver Eval Kit RoHS:否制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:

KIT34845EPEVME 功能描述:LED 照明开发工具 IC, 6 CHANNEL LED BACKL RoHS:否制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:

KIT34929EPEVME 功能描述:电源管理IC开发工具 1.0 A/ 28 V BRUSHLESS DC 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

KIT3500UZ 功能描述:KIT CAP CERM HI FREQ 1210 RoHS:是类别:套件 >> 无源 - 电容器系列:U 标准包装:1 系列:SP-Cap CD, CX, SL, SX 套件类型:聚合物，铝电解值:135 件 - 39µF ~ 470µF，各 15 件包装:- 安装类型:表面贴装包括封装:7343-17，7343-20 产品目录页面:2651 (CN2011-ZH PDF) 工具箱内容:(15) PCE4991CT-ND - CAP ALUM 220UF 4V 20% SMD(15) PCE4990CT-ND - CAP ALUM 330UF 2V 20% SMD(15) PCE4989CT-ND - CAP ALUM 150UF 6.3V 20% SMD(15) PCE4988CT-ND - CAP ALUM 150UF 6.3V 20% SMD(15) PCE4943CT-ND - CAP ALUM 39UF 10V 20% SMD(15) PCE4823CT-ND - CAP ALUM 470UF 2V 20% SMD(15) PCE4816CT-ND - CAP ALUM 220UF 4V 20% SMD(15) PCE4479CT-ND - CAP ALUM 220UF 2V 20% SMD(15) PCE4472CT-ND - CAP ALUM 120UF 2V 20% SMD 其它名称:SP4-KIT

KIT35XS3400EVBE 功能描述:交换机 IC 开发工具 QUAD HI SIDE SWITCH RoHS:否制造商:Maxim Integrated 产品:Evaluation Kits 类型:USB Power Switches 工具用于评估:MAX4984E 工作电源电压:2.8 V to 5.5 V