参数资料
型号: IR3092MPBF
厂商: International Rectifier
文件页数: 12/37页
文件大小: 0K
描述: IC VID VOLTAGE PROGRAMMER 48MLPQ
标准包装: 100
应用: VID 电压编程器
电源电压: 7.3 V ~ 21 V
电流 - 电源: 29mA
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 48-MLPQ
供应商设备封装: 48-MLPQ(7x7)
包装: 剪切带 (CT)
IR3092PbF
50% INTERNAL OSCILLATOR RAMP
DUTY CYCLE
CLK1
CLK2
RAMP2 MIN DUTY
CYCLE ADJUST
RAMP2 MAX DUTY
CYCLE ADJUST
EAOUT
0.7V
FIXED RAMP1
RAMP2
RAMP1 SLOPE = 57mV / % DC
THE SHARE ADJUST ERROR AMPLIFIER
CAN CHANGE THE PULSE WIDTH OF
RAMP2 FROM 0.5x RAMP1 TO 2.0x
RAMP1 TO FORCE CURRENT SHARING.
Figure 3 – 2 Phase Oscillator and PWM 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 x (I MAX - I MIN )] / Vout
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 th e synchronous rectifier’s
body diode occurs. This increases the voltage across the inductor from Vout to Vout + V BODY DIODE . The minimum time
required to reduce the current in the inductor in response to a load transient decrease is now;
T SLEW = [L x (I MAX - I MIN )] / (Vout + V BODY DIODE )
Since the voltage drop in the body diode is often higher than output voltage, the inductor current slew rate can be
increased by 2X or more. This patent pending technique is referred to as “body braking” and is accomplished through the
“0% Duty Cycle Comparator”. If the Error Amplifier’s output voltage drops below 0.55V, this comparator turns off the low
side gate driver.
Figure 4 depicts PWM operating waveforms under various conditions
Page 12 of 37
09/07/05
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