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参数资料
| 型号： | IR3529MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 10/22页 |
| 文件大小： | 0K |
| 描述： | IC CTRL XPHASE CPU/ASIC 20-MLPQ |
| 标准包装： | 1 |
| 系列： | XPhase3™ |
| 应用： | 处理器 |
| 电流 - 电源： | 2mA |
| 电源电压： | 8 V ~ 16 V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-MLPQ |
| 供应商设备封装： | 20-MLPQ（4x4） |
| 包装： | 标准包装 |
| 其它名称： | IR3529MTRPBFDKR |
IR3529
PHASE IC
CLOCK
PULSE
EAIN
PWMRMP
VDAC
GATEH
GATEL
STEADY-STATE
OPERATION
DUTY CYCLE INCREASE
DUE TO LOAD
INCREASE
DUTY CYCLE DECREASE
DUE TO VIN INCREASE
(FEED-FORWARD)
DUTY CYCLE DECREASE DUE TO LOAD
DECREASE (BODY BRAKING) OR FAULT
(VCCLUV, OCP, VID=11111X)
STEADY-STATE
OPERATION
Figure 3: PWM Operating Waveforms
Body Braking
TM
In a conventional synchronous buck converter, the minimum time required to reduce the current in the inductor in
response to a load step decrease is;
T SLEW =
L * ( I MAX ? I MIN )
V O
The slew rate of the inductor current can be significantly increased by turning off the synchronous rectifier in response
to a load step decrease. The switch node voltage is then forced to decrease until conduction of the synchronous
rectifier’s body diode occurs. This increases the voltage across the inductor from Vout to Vout + V BODYDIODE . The
minimum time required to reduce the current in the inductor in response to a load transient decrease is now;
T SLEW =
L * ( I MAX ? I MIN )
V O + V BODYDIODE
Since the voltage drop in the body diode is often comparable to the output voltage, the inductor current slew rate can
be increased significantly. This patented technique is referred to as “body braking” and is accomplished through the
“body braking comparator” located in the phase IC. If the error amplifier’s output voltage drops below the output voltage
of the share adjust amplifier in the phase IC, this comparator turns off the low side gate driver.
Lossless Average Inductor Current Sensing
Inductor current can be sensed by connecting a series resistor and a capacitor network in parallel with the inductor and
measuring the voltage across the capacitor, as shown in Figure 4. The equation of the sensing network is,
Page 10 of 22
v C ( s ) = v L ( s )
1
1 + sR CS C CS
= i L ( s )
R L + sL
1 + sR CS C CS
February 12, 2010
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相关代理商/技术参数 |
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|---|---|
| IR3531A | 制造商:IRF 制造商全称:International Rectifier 功能描述:41 Phase Dual Output Control IC Pre-bias compatible |
| IR3531A-MPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:41 Phase Dual Output Control IC Pre-bias compatible |
| IR3531AMTRPBF | 制造商:International Rectifier 功能描述:4+1 DUAL OUPUT CONTROLLER IC WITH I2C - Tape and Reel 制造商:International Rectifier 功能描述:IC OUTPUT CTRL 4+1 PHASE 48MLPQ 制造商:International Rectifier 功能描述:T&R / 4+1 Dual Ouput Controller IC with I2C |
| IR3531A-MTRPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:41 Phase Dual Output Control IC Pre-bias compatible |
| IR3531MTRPBF | 制造商:International Rectifier 功能描述:4+1 DUAL OUPUT CONTROLLER IC WITH I2C - Tape and Reel 制造商:International Rectifier 功能描述:IC OUTPUT CTRL 4+1 PHASE 48MLPQ 制造商:International Rectifier 功能描述:4 1 Dual Ouput Contr IC with I2C 制造商:International Rectifier 功能描述:T&R / 4+1 Dual Ouput Controller IC with I2C |
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