参数资料
| 型号： | ADP3198JCPZ-RL |
| 厂商： | ON Semiconductor |
| 文件页数： | 14/31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
OUTPUT CROWBAR
To protect the load and output components of the supply, the
PWM outputs are driven low, which turns on the low-side
MOSFETs when the output voltage exceeds the upper crowbar
threshold. This crowbar action stops once the output voltage
falls below the release threshold of approximately 375 mV.
Turning on the low-side MOSFETs pulls down the output as
the reverse current builds up in the inductors. If the output
overvoltage is due to a short in the high-side MOSFET, this
action current limits the input supply or blows its fuse,
protecting the microprocessor from being destroyed.
OUTPUT ENABLE AND UVLO
For the ADP3198 to begin switching, the input supply (VCC) to
the controller must be higher than the UVLO threshold and the
EN pin must be higher than its 0.85 V threshold. This initiates a
system start-up sequence. If either UVLO or EN is less than
their respective thresholds, the ADP3198 is disabled. This holds
the PWM outputs at ground, shorts the DELAY capacitor to
ground, and forces PWRGD and OD signals low.
In the application circuit (see Figure 10), the OD pin should be
connected to the OD inputs of the ADP3110A drivers.
Grounding OD disables the drivers such that both DRVH and
DRVL are grounded. This feature is important in preventing the
discharge of the output capacitors when the controller is shut
off. If the driver outputs are not disabled, a negative voltage can
be generated during output due to the high current discharge of
the output capacitors through the inductors.
THERMAL MONITORING
The ADP3198 includes a thermal-monitoring circuit to detect
when a point on the VR has exceeded two different user-
defined temperatures. The thermal-monitoring circuit requires
an NTC thermistor to be placed between TTSENSE and GND.
A fixed current of 8 × IREF (normally giving 123 μA) is sourced
out of the TTSENSE pin and into the thermistor. The current
source is internally limited to 5 V. An internal circuit compares
the TTSENSE voltage to a 1.105 V and a 0.81 V threshold, and
outputs an open-drain signal at the VRFAN and VRHOT
outputs, respectively. Once the voltage on the TTSENSE pin
drops below its respective threshold, the open-drain outputs
assert high to signal the system that an overtemperature event
has occurred. Because the TTSENSE voltage changes slowly
with respect to time, 50 mV of hysteresis is built into these com-
parators. The thermal monitoring circuitry does not depend on
EN and is active when UVLO is above its threshold. When UVLO
is below its threshold, VRFAN and VRHOT are forced low.
Table 4.VR11 and VR10.x VID Codes for the ADP3198
VR11 DAC CODES: VIDSEL = HIGH
VR10.x DAC CODES: VIDSEL = LOW
OUTPUT
OFF
OFF
1.60000
1.59375
1.58750
1.58125
1.57500
1.56875
1.56250
1.55625
1.55000
1.54375
1.53750
1.53125
1.52500
1.51875
1.51250
1.50625
1.50000
1.49375
1.48750
1.48125
1.47500
1.46875
1.46250
1.45625
VID7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VID6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
VID5 VID4 VID3 VID2
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 0
0 0 0 1
0 0 0 1
0 0 0 1
0 0 0 1
0 0 1 0
0 0 1 0
0 0 1 0
0 0 1 0
0 0 1 1
0 0 1 1
0 0 1 1
0 0 1 1
0 1 0 0
0 1 0 0
0 1 0 0
0 1 0 0
0 1 0 1
0 1 0 1
0 1 0 1
0 1 0 1
0 1 1 0
0 1 1 0
VID1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
VID3 VID2 VID1 VID0 VID5
N/A
N/A
1 0 1 0 1
1 0 1 0 1
1 0 1 1 0
1 0 1 1 0
1 0 1 1 1
1 0 1 1 1
1 1 0 0 0
1 1 0 0 0
1 1 0 0 1
1 1 0 0 1
1 1 0 1 0
1 1 0 1 0
1 1 0 1 1
1 1 0 1 1
1 1 1 0 0
1 1 1 0 0
1 1 1 0 1
1 1 1 0 1
1 1 1 1 0
1 1 1 1 0
1 1 1 1 1
1 1 1 1 1
0 0 0 0 0
0 0 0 0 0
VID6
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Rev. 2 | Page 14 of 31 | www.onsemi.com
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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 |
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