- 您现在的位置：买卖IC网 > PDF目录1777 > ADP3207CJCPZ-RL (ON Semiconductor)IC CTLR SYNC BUCK 7BIT 40-LFCSP PDF资料下载
参数资料
| 型号： | ADP3207CJCPZ-RL |
| 厂商： | ON Semiconductor |
| 文件页数： | 27/32页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SYNC BUCK 7BIT 40-LFCSP |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel IMVP-6 |
| 输入电压： | 3.3 V ~ 22 V |
| 输出数： | 3 |
| 输出电压： | 0.3 V ~ 1.5 V |
| 工作温度： | -10°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 40-LFCSP-VQ（6x6） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页当前第27页第28页第29页第30页第31页第32页
ADP3207C
1 *
(eq. 21)
X
SW
O
R LIM +
ramp size that gives an optimal balance for good stability,
transient response, and thermal balance.
COMP Pin Ramp
There is a ramp signal on the COMP pin due to the droop
voltage and output voltage ramps. This ramp amplitude adds
to the internal ramp to produce the following overall ramp
signal at the PWM input:
V R
V RT +
2 (1 * n D)
n f C R
For this example, the overall ramp signal is found to be 2.2 V.
Setting the Switching Frequency for RPM Mode Operation
of Phase.
During the RPM mode operation of Phase 1, the
ADP3207C runs in pseudo constant frequency, given that
the load current is high enough for continuous current mode.
While in discontinuous current mode, the switching
frequency is reduced with the load current in a linear
manner. When considering power conversion efficiency in
light load, lower switching frequency is usually preferred
for RPM mode. However, the VCore ripple specification in
the IMVP ? 6 sets the limitation for lowest switching
frequency. Therefore, depending on the inductor and output
capacitors, the switching frequency in RPM mode can be
equal, larger, or smaller than its counterpart in PWM mode.
A resistor from RPM to GND sets the pseudo constant
frequency as following:
Where:
R MON is the current monitor resistor. R MON is connected
from I MON pin to FBRTN.
R LIM is the current limit resistor.
R O is the output load line resistance.
I FS is the output current when the voltage on I MON is at full
scale.
Current Limit Setpoint
To select the current limit setpoint, we need to find the
resistor value for R LIM . The current limit threshold for the
ADP3207C is set when the current in R LIM is equal to the
internal reference current of 20 m A. The current in R LIM is
equal to the inductor current times R O . R LIM can be found
using the following equation:
I LIM R O
20 m A (eq. 25)
Where:
R LIM is the current limit resistor. R LIM is connected from the
I LIM pin to ground.
R O is the output load line resistance.
I LIM is the current limit set point. This is the peak inductor
current that will trip current limit.
In this example, if choosing 55 A for I LIM , R LIM is
5.775 k W , which is close to a standard 1% resistance of
5.76 k W .
The per phase current limit described earlier has its limit
determined by the following:
R T
R RPM +
2
V VID ) 1.0 V
A R
R R
(1 * D)
C R
V VID
f SW
I PHLIM ^
V COMP(MAX) * V R * V BIAS
A D R DS(MAX)
)
I R
2
(eq. 26)
R RPM +
V R
D LIM + D MIN
R LIM
R MON +
R O
I FS
* 0.5 k W (eq. 22)
Where:
A R is the internal ramp amplifier gain.
C R is the internal ramp capacitor value.
R R is an external resistor on the RAMPADJ pin to set the
internal ramp magnitude.
Because R R = 280 k W , the following resistance sets up
300 kHz switching frequency in RPM operation:
2 280 k W 0.5 (1 * 0.061) 1.150
1.150 V ) 1.0 V 462 k W 5 pF 300 kHz
* 5 W + 202 k W (eq. 23)
Output Current Monitor
The ADP3207C has output current monitor. The I MON pin
sources a current proportional to the total inductor current.
A resistor, R MON , from I MON to FBRTN sets the gain of the
output current monitor. A 0.1 m F is placed in parallel with
R MON to filter the inductor current ripple and high frequency
load transients. Since the I MON pin is connected directly to
the CPU, it is clamped to prevent it from going above 1.15 V.
The I MON pin current is equal to the R LIM times a fixed
gain of 10. R MON can be found using the following equation:
1.15 V
10 (eq. 24)
For the ADP3207C, the maximum COMP voltage
(V COMP(MAX) ) is 3.3 V, the COMP pin bias voltage (V BIAS )
is 1.0 V, and the current balancing amplifier gain (A D ) is 5.
Using a V R of 0.55 V, and a R DS(MAX) of 3.8 m W (low ? side
on ? resistance at 150 ° C) results in a per phase limit of 85 A.
Although this number seems high, this current level can only
be reached with a absolute short at the output and the current
limit latchoff function shutting down the regulator before
overheating occurs.
This limit can be adjusted by changing the ramp voltage
V R . However, users should not set the per phase limit lower
than the average per phase current (I LIM /n).
There is also a per phase initial duty ? cycle limit at
maximum input voltage:
V COMP(MAX) * V BIAS
(eq. 27)
For this example, the duty ? cycle limit at maximum input
voltage is found to be 0.25 when D is 0.061.
Feedback Loop Compensation Design
Optimized compensation of the ADP3207C allows the best
possible response of the regulator’s output to a load change.
The basis for determining the optimum compensation is to
make the regulator and output decoupling appear as an output
http://onsemi.com
27
相关PDF资料 |
PDF描述 |
|---|---|
| ADP3207DJCPZ-RL | IC CTLR BUCK 7BIT MULTI 40LFCSP |
| ADP3208CJCPZ-RL | IC CTLR BUCK 7BIT IMVP6 48LFCSP |
| ADP3208DJCPZ-RL | IC CTLR BUCK 7BIT 2PHASE 48LFCSP |
| ADP320ACPZ-110-R7 | IC REG LDO 3.3/3.3/1.5V 16LFCSP |
| ADP3210MNR2G | IC CTLR BUCK 7BIT MULTIPH 40QFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3207D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:7-Bit Programmable, Multi-Phase Mobile, CPU Synchronous Buck |
| ADP3207DJCPZ-RL | 功能描述:DC/DC 开关控制器 IMVP6 BUCK CONTROLLER RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ADP3207JCPZ-RL | 功能描述:DC/DC 开关控制器 IMVP6 MLTI/PHSE CNTR RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| ADP3208AJCPZ-RL | 功能描述:肖特基二极管与整流器 IMVP6 MLT-PH CTRL W/DRVR RoHS:否 制造商:Skyworks Solutions, Inc. 产品:Schottky Diodes 峰值反向电压:2 V 正向连续电流:50 mA 最大浪涌电流: 配置:Crossover Quad 恢复时间: 正向电压下降:370 mV 最大反向漏泄电流: 最大功率耗散:75 mW 工作温度范围:- 65 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SOT-143 封装:Reel |
| ADP3208C | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:7-Bit,Programmable,Dual- Phase,Mobile,CPU,Synchronous Buck Controller |
发布紧急采购，3分钟左右您将得到回复。