Datasheet > 电源电路 > 开关式稳压器或控制器> ADP3155JRU-REEL

ADP3155JRU-REEL

更新时间： 2024-02-26 02:59:05

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
14页	202K
描述
IC SWITCHING CONTROLLER, PDSO20, TSSOP-20, Switching Regulator or Controller

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技术参数
数据手册

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ADP3155JRU-REEL 技术参数

是否无铅：	含铅	是否Rohs认证：	不符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP,	针数：	20
Reach Compliance Code：	unknown	风险等级：	5.23
Is Samacsys：	N	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
标称输入电压：	12 V	JESD-30 代码：	R-PDSO-G20
JESD-609代码：	e0	长度：	6.5 mm
湿度敏感等级：	NOT SPECIFIED	功能数量：	1
端子数量：	20	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：	TSSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	220
认证状态：	COMMERCIAL	座面最大高度：	1.2 mm
表面贴装：	YES	切换器配置：	PUSH-PULL
温度等级：	COMMERCIAL	端子面层：	TIN LEAD
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	4.4 mm	Base Number Matches：	1

ADP3155JRU-REEL 数据手册

ADP3155

12V

Table I. Output Voltage vs. VID Code

VID0–

VID4

5-BIT CODE

VID4 VID3 VID2 VID1 VID0 V_OUT

0.1␮F

1␮F

ADP3155

1.30

DRIVE1

CMP

1.35

1.40

1.45

1.50

1.55

1.60

1.65

1.70

1.75

1.80

1.85

1.90

1.95

2.00

2.05

DRIVE2

1k⍀

SENSE+

SENSE–

PGND

4700pF

AGND

OUT

OP27

100k⍀

1.2V

0.1␮F

Figure 13. Closed-Loop Test Circuit for Accuracy

THEORY OF OPERATION

The ADP3155 uses a current-mode, constant-off-time control

technique to switch a pair of external N-channel MOSFETs in

a synchronous buck topology. Constant off-time operation

offers several performance advantages, including that no slope

compensation is required for stable operation. A unique feature

of the constant-off-time control technique is that since the off-

time is fixed, the converter’s switching frequency is a function

of the ratio of input voltage to output voltage. The fixed off-

time is programmed by the value of an external capacitor con-

nected to the C_Tpin. The on-time varies in such a way that a

regulated output voltage is maintained as described below in the

cycle-by-cycle operation. Under fixed operating conditions the

on-time does not vary, and it varies only slightly as a function of

load. This means that switching frequency is fairly constant in

standard VRM applications. In order to maintain a ripple cur-

rent in the inductor that is independent of the output voltage

(which also helps control losses and simplify the inductor de-

sign), the off-time is made proportional to the value of the out-

put voltage. Normally, the output voltage is constant and,

therefore, the off-time is constant as well.

No CPU–Shutdown

2.10

2.20

2.30

2.40

2.50

2.60

2.70

2.80

2.90

3.00

3.10

3.20

3.30

3.40

3.50

Cycle-by-Cycle Operation

During normal operation (when the output voltage is regulated),

the voltage-error amplifier and the current comparator (CMPI)

are the main control elements. (See the block diagram of Figure

3.) During the on-time of the high side MOSFET, CMPI moni-

tors the voltage between the SENSE+ and SENSE– pins. When

the voltage level between the two pins reaches the threshold level

V_T1, the high side drive output is switched to ground, which

turns off the high side MOSFET. The timing capacitor C_Tis

then discharged at a rate determined by the off-time controller.

While the timing capacitor is discharging, the low side drive

output goes high, turning on the low side MOSFET. When the

voltage level on the timing capacitor has discharged to the thresh-

old voltage level V_T2, comparator CMPT resets the SR flip-flop.

The output of the flip-flop forces the low side drive output to go

low and the high side drive output to go high. As a result, the low

side switch is turned off and the high side switch is turned on.

The sequence is then repeated. As the load current increases, the

output voltage starts to decrease. This causes an increase in the

output of the voltage-error amplifier, which, in turn, leads to an

increase in the current comparator threshold V_T1, thus tracking

the load current. To prevent cross conduction of the external

MOSFETs, feedback is incorporated to sense the state of the driver

output pins. Before the low side drive output can go high, the

high side drive output must be low. Likewise, the high side drive

output is unable to go high while the low side drive output is high.

Active Voltage Positioning

The output voltage is sensed at the SENSE– pin. A voltage-

error amplifier, (g_m), amplifies the difference between the output

voltage and a programmable reference voltage. The reference

voltage is programmed to between 1.3 V and 3.5 V by an inter-

nal 5-bit DAC, which reads the code at the voltage identifica-

tion (VID) pins. (Refer to Table I for output voltage vs. VID pin

code information.) A unique supplemental regulation technique

called active voltage positioning with optimal compensation

adjusts the output voltage as a function of the load current so

that it is always optimally positioned for a load transient. Stan-

dard (passive) voltage positioning, sometimes recommended for

use with other architectures, has poor dynamic performance

which renders it ineffective under the stringent repetitive tran-

sient conditions specified in Intel VRM documents. Conse-

quently, such techniques do not allow the minimum possible

number of output capacitors to be used. Optimally compen-

sated active voltage positioning as used in the ADP3155 pro-

vides a bandwidth for transient response that is limited only by

parasitic output inductance. This yields optimal load transient

response with the minimum number of output capacitors.

–6–

REV. A

1...3 4 567 8 9...14

中文翻译

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与ADP3155JRU-REEL相关器件

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ADP3155JRU-REEL7	ROCHESTER	获取价格	SWITCHING CONTROLLER, PDSO20, TSSOP-20
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ADP3156	ADI	获取价格	Dual Power Supply Controller for Desktop Systems
ADP3156JR-1.5	ETC	获取价格	Current-Mode SMPS Controller
ADP3156JR-1.5-REEL	ADI	获取价格	IC SWITCHING CONTROLLER, PDSO16, SOIC-16, Switching Regulator or Controller
ADP3156JR-1.8	ETC	获取价格	Current-Mode SMPS Controller
ADP3156JR-15	ADI	获取价格	Dual Power Supply Controller for Desktop Systems
ADP3156JR-18	ADI	获取价格	Dual Power Supply Controller for Desktop Systems
ADP3156JR-2.5	ETC	获取价格	Current-Mode SMPS Controller
ADP3156JR-2.5-REEL	ADI	获取价格	IC SWITCHING CONTROLLER, PDSO16, SOIC-16, Switching Regulator or Controller

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