参数资料
| 型号： | ADP3198JCPZ-RL |
| 厂商： | ON Semiconductor |
| 文件页数： | 27/31页 |
| 文件大小： | 0K |
| 描述： | IC BUCK CTRLR 8BIT PROG 40LFCSP |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel VRM |
| 输入电压： | 12V |
| 输出数： | 4 |
| 输出电压： | 0.5 V ~ 1.6 V |
| 工作温度： | 0°C ~ 85°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) |
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ADP3198
Figure 13 and Figure 14 show the typical transient response
using these compensation values.
1
The capacitor manufacturer’s ripple-current ratings are often
based on only 2000 hours of life. As a result, it advisable to
further derate the capacitor or to choose a capacitor rated at a
higher temperature than required. Several capacitors can be
placed in parallel to meet size or height requirements in the
design. In this example, the input capacitor bank is formed by
two 2700 μF, 16 V aluminum electrolytic capacitors and eight
4.7 μF ceramic capacitors.
To reduce the input current di/dt to a level below the recom-
mended maximum of 0.1 A/μs, an additional small inductor
(L > 370 nH at 18 A) should be inserted between the converter
and the supply bus. This inductor also acts as a filter between
the converter and the primary power source.
CH1 50mV
M 10 μ s
A CH1
–36mV
THERMAL MONITOR DESIGN
Figure 13. Typical Transient Response for Design Example Load Step
A thermistor is used on the TTSENSE input of the ADP3198
for monitoring the temperature of the VR. A constant current
of 123 μA is sourced out of this pin and runs through a
thermistor network such as the one shown in Figure 15.
ADP3198
1
8
VRFAN
OPTIONAL
TEMPERATURE
ADJUST RESISTOR
9
10
VRHOT
TTSENSE
CH1 50mV
M 10 μ s
A CH1
–36mV
PLACE
THERMISTOR
NEAR CLOSEST
PHASE
R TTSENSE
0.1 μ F
Figure 14. Typical Transient Response for Design Example Load Release
C IN SELECTION AND INPUT CURRENT
di/dt REDUCTION
In continuous inductor current mode, the source current of the
high-side MOSFET is approximately a square wave with a duty
ratio equal to n × V OUT /V IN and an amplitude of one-nth the
maximum output current. To prevent large voltage transients,
a low ESR input capacitor, sized for the maximum rms current,
must be used. The maximum rms capacitor current is given by
Figure 15. VR Thermal Monitor Circuit
A voltage is generated from this current through the thermistor
and sensed inside the IC. When the voltage reaches 1.105 V,
the VRFAN output gets set. When the voltage reaches 0.81 V,
the VRHOT gets set. This corresponds to R TTSENSE values of
8.98 kΩ for VRFAN and 6.58 kΩ for VRHOT.
These values correspond to a thermistor temperature of ~100°C
and ~110°C when using the same type of 100 kΩ NTC thermistor
used in the current sense amplifier.
I CRMS = D × I O ×
1
N × D
? 1
(44)
An additional fixed resistor in parallel with the thermistor allows
tuning of the trip point temperatures to match the hottest tem-
perature in the VR, when the thermistor itself is directly sensing
I CRMS = 0 . 108 × 1 19 A ×
1
4 × 0.108
? 1 = 14.7 A
a proportionately lower temperature. Setting this resistor value
is best accomplished with a variable resistor during thermal
validation and then fixing this value for the final design.
Additionally, a 0.1 μF capacitor should be used for filtering noise.
Rev. 2 | Page 27 of 31 | www.onsemi.com
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相关代理商/技术参数 |
参数描述 |
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| ADP3199AJCPZ-RL | 功能描述:DC/DC 开关控制器 LSER SPEC VS ADP3193 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 |
| ADP3199JCPZ-RL | 功能描述:DC/DC 开关控制器 LSER SPEC VS ADP3193 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 |
| ADP32 | 功能描述:插座和适配器 EEROM-8U ADAPTER 32-PIN PLCC PACKAGE RoHS:否 制造商:Silicon Labs 产品:Adapter 用于:EM35x |
| ADP320 | 制造商:AD 制造商全称:Analog Devices 功能描述:Triple, 200 mA, Low Noise, High PSRR Voltage Regulator |
| ADP3203 | 制造商:AD 制造商全称:Analog Devices 功能描述:2-Phase IMVP-II & IMVP-III Core Controller for Mobile CPUs |
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