ADP1147AN-3.3

更新时间： 2024-01-20 07:20:59

品牌	Logo	应用领域
亚德诺 - ADI		开关控制器
页数	文件大小	规格书
12页	199K
描述
Current-Mode SMPS Controller

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

ADP1147AN-3.3 数据手册

ADP1147-3.3/ADP1147-5

T o obtain optimum efficiency the required ESR value of C_OUT

P r inted Wir e Boar d Layout Consider ations

is 100 mΩ or less.

T he PWB layout is extremely critical for proper circuit opera-

tion and the items listed below should be carefully considered

(see Figure 20)

T he circuit should also be evaluated with the minimum input

voltage. T his is done to assure that the power dissipation and

junction temperature of the P-channel MOSFET are not ex-

ceeded. At lower input voltages the operating frequency of the

ADP1147 decreases. T his causes the P-channel MOSFET to

remain in conduction for longer periods of time, resulting in

more power dissipation in the MOSFET .

1. T he signal and power grounds should be separate from each

other. T hey should be tied together only at ground Pin 7 of

the ADP1147. T he power ground should be tied to the an-

ode of the Schottky diode, and the (–) side of the C_INcapaci-

tor. T he connections should be made with traces that are as

wide and as short as possible. T he signal ground should be

connected to the (–) side of capacitor C_OUTusing the same

type of runs as above.

T he effects of V_IN(MIN)can be evaluated if we assume the

following:

V_IN(MIN)= 4.5 V

V_OUT= 3.3 V

V_D= 0.4 V

2. T he sense(–) run to Pin 4 of the ADP1147 should be con-

nected directly to the junction point of R_SENSEand the + side

of C_OUT

f_MIN= (1/3.15 µs) × (1– (3.7/4.9)) = 78 kHz.

3. T he sense(–) and sense(+) traces should be routed together

with minimum track spacing and run lengths. T he 1000 pF

filter capacitor across Pins 4 and 5 of the ADP1147 should

be located as close to the device as possible.

3.3(0.125 Ω)(1 A)²(1.2625 )

P_D

= 116 mW

4.5

Tr oubleshooting H ints

4. In order to supply sufficient ac current the (+) side of capaci-

tor C_INshould be connected with wide short traces and must

be located as close to the source of the P-MOSFET as possible.

Efficiency is the primary reason for choosing the ADP1147 for

use in an application, and it is critical to determine that all por-

tions of the circuit are functioning properly in all modes. After

the design is complete the voltage waveforms on the timing

capacitor, C_T, at Pin 2 of the device, should be compared to the

waveforms in Figures 19a and 19b.

5. In order to supply high frequency peak currents the input

decoupling capacitors should range from 0.1 µF to 1.0 µF

and must be located as close to the V_INpin and the ground

Pin 7 as possible.

In the continuous mode of operation the dc voltage level of the

waveform on C_Tshould never fall below the 2 V level and it

should have a 0.9 V peak-to-peak sawtooth on it (see Figure

19a).

6. T he shutdown Pin (6) is a high impedance input and it must

not be allowed to float. T he normal mode of operation of the

device requires that this pin be pulled low.

In the Power Savings Mode the sawtooth waveform on C_Twill

decay to ground for extended periods of time (see Figure 19b).

During the time that the capacitor voltage is at ground the

ADP1147 is in the power savings or sleep mode and the qui-

escent current is reduced to 160 µA typical.

T he ripple current in the inductor should also be monitored to

determine that it is approximately the same in both modes of

operation. With a higher output currents the voltage level on C_T

should never decay to ground as this would indicate poor

grounding and or decoupling.

REV. 0

–11–

1...8 9 101112

中文翻译

下载PDF

与ADP1147AN-3.3相关器件

型号	品牌	获取价格	描述	数据表
ADP1147AN-33	ADI	获取价格	High Efficiency Step-Down Switching Regulator Controllers
ADP1147AN-5	ADI	获取价格	High Efficiency Step-Down Switching Regulator Controllers
ADP1147AN-5	ROCHESTER	获取价格	SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8
ADP1147AR-3.3	ADI	获取价格	Current-Mode SMPS Controller
ADP1147AR-3.3	ROCHESTER	获取价格	SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO8, SOIC-8
ADP1147AR-3.3-REEL	ADI	获取价格	IC SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO8, SOIC-8, Switching Regulator or
ADP1147AR-33	ADI	获取价格	High Efficiency Step-Down Switching Regulator Controllers
ADP1147AR-5	ADI	获取价格	High Efficiency Step-Down Switching Regulator Controllers
ADP1147AR-5	ROCHESTER	获取价格	SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO8, SOIC-8
ADP1147AR-5-REEL7	ROCHESTER	获取价格	SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO8, SOIC-8

与ADP1147AN-3.3相关文章

LM317T数据手册解读：产品特性、应用、封装与引脚详解
2024-06-14

4
一文带你了解?DB3二极管好坏判断、参数信息、替代推荐
2024-06-14

9
LM358DR数据手册：引脚说明、电气参数及替换型号推荐
2024-06-14

3
OP07CP数据手册解读：引脚信息、电子参数
2024-06-14

3

产品中心

服务支持

精选活动

关于我们

帮助中心

ADP1147AN-3.3

ADP1147AN-3.3 数据手册

与ADP1147AN-3.3相关器件

与ADP1147AN-3.3相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

ADP1147AN-3.3

ADP1147AN-3.3 数据手册

与ADP1147AN-3.3相关器件

与ADP1147AN-3.3相关文章

您还可以找

您在本页遇到什么问题？