参数资料
| 型号： | ADP3211AMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 22/32页 |
| 文件大小： | 0K |
| 描述： | IC CTLR BUCK 7BIT 2PHASE 32QFN |
| 标准包装： | 1 |
| 应用： | 控制器，用于下一代 Intel 处理器的电源 |
| 输入电压： | 3.3 V ~ 22 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（5x5） |
| 包装： | 标准包装 |
| 其它名称： | ADP3211AMNR2GOSDKR |
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ADP3211, ADP3211A
Application Information
The ADP3211 application circuit should be fine ? tuned in
the final design. The equations in the Application Information
section are used as a starting point for a new design.
The design parameters for a typical IMVP ? 6.5 ?
compliant GPU core VR application are as follows:
? Maximum input voltage (V INMAX ) = 19 V
? Minimum input voltage (V INMIN ) = 8.0 V
? Output voltage by VID setting (V VID ) = 1.1 V
? Maximum output current (I O ) = 10 A
? Droop resistance (R O ) = 8 m W
? Nominal output voltage at 10 A load (V OFL ) = 1.02 V
? Static output voltage drop from no load to full load
( D V) = V ONL ? V OFL = 1.1 V ? 1.02 V = 80 mV
? Maximum output current step ( D I O ) = 8 A
? Switching frequency (f SW ) = 400 kHz
? Duty cycle at maximum input voltage (D MAX ) = 0.14
? Duty cycle at minimum input voltage (D MIN ) = 0.054
where:
A R is the internal ramp amplifier gain.
A D is the current balancing amplifier gain.
R DS is the total low ? side MOSFET on ? resistance,
C R is the internal ramp capacitor value.
Setting the Switching Frequency for
RPM Operation
During the RPM operation, the ADP3211 runs in
pseudo ? constant frequency if the load current is high
enough for continuous current mode. While in DCM, the
switching frequency is reduced with the load current in a
linear manner. To save power with light loads, lower
switching frequency is usually preferred during RPM
operation. However, the V CCGFX ripple specification of
IMVP ? 6.5 sets a limitation for the lowest switching
frequency. Therefore, depending on the inductor and
output capacitors, the switching frequency in RPM can be
equal to, greater than, or less than its counterpart in PWM.
A resistor from RPM to GND sets the pseudo constant
V VID ) 1.0 V
Setting the Clock Frequency for PWM
The ADP3211 operates in fixed frequency PWM mode
during startup, for 100 m s after a VID change, and in current
limit. In PWM operation, the ADP3211 uses a
frequency as following:
2 R T
R RPM +
A R
R R
(1 * D)
C R
V VID
f SW
* 0.5 k W
(eq. 3)
fixed ? frequency control architecture. The frequency is set by
an external timing resistor (R T ). The clock frequency
determines the switching frequency, which relates directly to
the switching losses and the sizes of the inductors and input
and output capacitors. For example, a clock frequency of 400
kHz sets the switching frequency to 400 kHz. This selection
represents the trade ? off between the switching losses and the
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 = 718 k W , the following resistance sets up
400 kHz switching frequency in RPM operation.
minimum sizes of the output filter components. To achieve a
400 kHz oscillator frequency at a VID voltage of 1.1 V, R T
must be 274 k W . Alternatively, the value for R T can be
calculated by using the following equation:
R RPM +
2 274 k W
1.1 V ) 1.0 V
0.5 (1 * 0.054)
718 k W 5 pF
1.1 V
400 kHz
* 500 W + 93.1 k W
(eq. 4)
V VID ) 1.0 V
R T + * 16 k W
A R L
R R +
2 f SW 9 pF (eq. 1)
where:
9 pF and 16 k W are internal IC component values.
V VID is the VID voltage in volts.
f SW is the switching frequency in hertz.
For good initial accuracy and frequency stability, it is
recommended to use a 1% resistor.
Ramp Resistor Selection
The ramp resistor (R R ) is used for setting the size of the
internal PWM ramp. The value of this resistor is chosen to
provide the best combination of thermal balance, stability,
and transient response. Use this equation to determine a
starting value:
3 A D R DS C R
Inductor Selection
The choice of inductance determines the ripple current
of the inductor. Less inductance results in more ripple
current, which increases the output ripple voltage and the
conduction losses in the MOSFETs. However, this allows
the use of smaller ? size inductors, and for a specified
peak ? to ? peak transient deviation, it allows less total output
capacitance. Conversely, a higher inductance results in
lower ripple current and reduced conduction losses, but it
requires larger ? size inductors and more output capacitance
for the same peak ? to ? peak transient deviation. For a buck
converter, the practical value for peak ? to ? peak inductor
ripple current is less than 50% of the maximum dc current
of that inductor. Equation 5 shows the relationship between
the inductance, oscillator frequency, and peak ? to ? peak
ripple current. Equation 6 can be used to determine the
minimum inductance based on a given output ripple
R R +
3
0.5
5
560 nH
5.2 m W
5 pF
+ 718 k W
(eq. 2)
voltage.
http://onsemi.com
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3211MNR2G | 功能描述:DC/DC 开关控制器 IMVP6.5 BCK CTRL 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 |
| ADP3211NMNR2G | 功能描述:DC/DC 开关控制器 IMVP6.5 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 |
| ADP3212 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:7-Bit Programmable, 3-Phase, Mobile CPU Synchronous Buck Controller |
| ADP32120091MNR2G | 制造商:ON Semiconductor 功能描述: |
| ADP3212A | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:7-Bit, Programmable, 3-Phase, Mobile CPU Synchronous Buck Controller |
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