- 您现在的位置：买卖IC网 > PDF目录384487 > IR3500MTRPBF (International Rectifier) XPHASE3TM VR11.0 & AMD PVID CONTROL IC PDF资料下载
参数资料
| 型号： | IR3500MTRPBF |
| 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： | 21/47页 |
| 文件大小： | 778K |
| 代理商： | IR3500MTRPBF |
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页当前第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页
IR3500
Page 21 of 47
June 12, 2007
START DELAY (TD1)
VCC
(12V)
ENABLE
1.4V
VOUT
VRRDY
3.92V
SS/DEL
NORMAL OPERATION
VDAC
4.0V
VID
SOFT START
TIME (TD2)
VRRDY DELAY TIME (TD3)
EAOUT
Figure 12 - Start-up sequence of converter without boot voltage
Constant Over-Current Control during Soft Start
The over current limit threshold is set by a resistor connected between OCSET and VDAC. If the IIN pin voltage,
which is proportional to the average current plus VDAC voltage, exceeds the OCSET voltage during soft start, the
constant over-current control is activated. Figure 13 shows the constant over-current control with delay during soft
start. The delay time is set by the ROSC resistor, which sets the number of switching cycles for the delay counter.
The delay is required since over-current conditions can occur as part of normal operation due to inrush current. If an
over-current occurs during soft start (before VRRDY is asserted), the SS/DEL voltage is regulated by the over
current amplifier to limit the output current below the threshold set by OCSET voltage. If the over-current condition
persists after delay time is reached, the fault latch will be set pulling the error amplifier’s output low and inhibiting
switching in the phase ICs. The SS/DEL capacitor will discharge until it reaches 0.2V and the fault latch is reset
allowing a normal soft start to occur. If an over-current condition is again encountered during the soft start cycle, the
constant over-current control actions will repeat and the converter will be in hiccup mode. The delay time is
controlled by a counter which is triggered by clock. The counter values vary with switching frequency per phase in
order to have a similar delay time for different switching frequencies.
Over-Current Hiccup Protection after Soft Start
The over current limit threshold is set by a resistor connected between OCSET and VDAC pins. Figure 13 shows
the constant over-current control with delay after VRRDY is asserted. The delay is required since over-current
conditions can occur as part of normal operation due to load transients or VID transitions.
If the IIN pin voltage, which is proportional to the average current plus VDAC voltage, exceeds the OCSET voltage
after VRRDY is asserted, it will initiate the discharge of the capacitor at SS/DEL. The magnitude of the discharge
current is proportional to the voltage difference between IIN and OCSET and has a maximum nominal value of
55uA. If the over-current condition persists long enough for the SS/DEL capacitor to discharge below the 120mV
offset of the delay comparator, the fault latch will be set pulling the error amplifier’s output low and inhibiting
switching in the phase ICs and de-asserting the VRRDY signal. The output current is not controlled during the delay
time. The SS/DEL capacitor will discharge until it reaches 200 mV and the fault latch is reset allowing a normal soft
start to occur. If an over-current condition is again encountered during the soft start cycle, the over-current action
will repeat and the converter will be in hiccup mode.
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| IR4426PBF | DUAL LOW SIDE DRIVER |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| IR3502_09 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
发布紧急采购，3分钟左右您将得到回复。