Datasheet > ADP1147

ADP1147

更新时间： 2024-02-17 11:19:53

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
High Efficiency Step-Down Switching Regulator Controllers

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技术参数
数据手册

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ADP1147 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Obsolete	零件包装代码：	DIP
包装说明：	PLASTIC, DIP-8	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.8
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER	控制模式：	CURRENT-MODE
控制技术：	CONSTANT OFF TIME	最大输入电压：	20 V
最小输入电压：	3.5 V	标称输入电压：	10 V
JESD-30 代码：	R-PDIP-T8	JESD-609代码：	e0
长度：	9.88 mm	功能数量：	1
端子数量：	8	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	DIP	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
认证状态：	Not Qualified	座面最大高度：	5.33 mm
最大供电电流 (Isup)：	2.3 mA	表面贴装：	NO
切换器配置：	SINGLE	最大切换频率：	250 kHz
温度等级：	COMMERCIAL	端子面层：	TIN LEAD
端子形式：	THROUGH-HOLE	端子节距：	2.54 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.62 mm	Base Number Matches：	1

ADP1147 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

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与ADP1147相关器件

型号	品牌	描述	获取价格	数据表
ADP1147-3.3	ADI	High Efficiency Step-Down Switching Regulator Controllers	获取价格
ADP1147-5	ADI	High Efficiency Step-Down Switching Regulator Controllers	获取价格
ADP1147AN	ADI	IC SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8, Switching Regu	获取价格
ADP1147AN-3.3	ADI	Current-Mode SMPS Controller	获取价格
ADP1147AN-3.3	ROCHESTER	SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDIP8, PLASTIC, DIP-8	获取价格
ADP1147AN-33	ADI	High Efficiency Step-Down Switching Regulator Controllers	获取价格

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