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参数资料
| 型号： | IR3500MPBF |
| 厂商： | International Rectifier |
| 英文描述： | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 中文描述： | XPHASE3TM VR11.0 |
| 文件页数： | 24/47页 |
| 文件大小： | 778K |
| 代理商： | IR3500MPBF |
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IR3500
Page 24 of 47
June 12, 2007
phase IC, the OVP circuit overrides the normal PWM operation and will fully turn-on the low side MOSFET within
approximately 150ns. The low side MOSFET will remain on until ISHARE pin voltage drops below V(VCCL) -
800mV, which signals the end of over voltage condition. An over voltage fault condition is latched in the IR3500 and
can only be cleared by cycling power to the IR3500 VCCL.
AFTER
OVP
130mV
FAULT
LATCH
OUTPUT
VOLTAGE
(VO)
OVP
THRESHOLD
IIN
(ISHARE)
VCCL-800 mV
OVP CONDITION
NORMAL OPERATION
GATEH
(PHASE IC)
GATEL
(PHASE IC)
ERROR
AMPLIFIER
OUTPUT
(EAOUT)
VDAC
Figure 15 - Over-voltage protection during normal operation
In the event of a high side MOSFET short before power up, the OVP flag is activated with as little supply voltage as
possible, as shown in Figure 16. The VOSEN+ pin is compared against a fixed voltage of 1.73V (typical) for OVP
conditions at power-up. The ROSC/OVP pin will be pulled higher than 1.6V with VCCLDRV voltage as low as 1.8V.
An external MOSFET or comparator should be used to disable the silver box, activate a crowbar, or turn off the
supply source. The 1.8V threshold is used to prevent false over-voltage triggering caused by pre-charging of output
capacitors.
Pre-charging of converter output voltage may trigger OVP. If the converter output is pre-charged above 1.73V as
shown in Figure 17, ROSC/OVP pin voltage will be higher than 1.6V when VCCLDRV voltage reaches 1.8V.
ROSC/OVP pin voltage will be VCCLDRV-1V and rise with VCCLDRV voltage until VCCL is above UVLO threshold,
after which ROSC/OVP pin voltage will be VCCL-1V. The converter cannot start unless the over voltage condition
stops and VCCL is cycled. If the converter output is pre-charged 130mV above VDAC but lower than 1.73V, as
shown in Figure 17, the converter will soft start until SS/DEL voltage is above 3.92V (4.0V-0.08V). Then, over
voltage comparator is activated and fault latch is set.
相关PDF资料 |
PDF描述 |
|---|---|
| IR3500MTRPBF | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| IR3623MPBF | HIGH FREQUENCY 2-PHASE, SINGLE OR DUAL OUTPUT SYNCHRONOUS STEP DOWN CONTROLLER WITH OUTPUT TRACKING AND SEQUENCING |
| IR3624MPBF | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER |
| IR3624MTRPBF | HIGH FREQUENCY SYNCHRONOUS PWM BUCK CONTROLLER |
| IR4426 | DUAL LOW SIDE DRIVER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3500MTRPBF | 功能描述:开关变换器、稳压器与控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3500V | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3500V AMD SVID CTRL IC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3502 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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