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参数资料
| 型号： | IR3009 |
| 厂商： | International Rectifier |
| 英文描述： | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 3相皓龙，速龙，或控制IC的VR10.X |
| 文件页数： | 12/39页 |
| 文件大小： | 693K |
| 代理商： | IR3009 |
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IR3093
Page 12 of 39
07/15/04
Figure 3
– 3 Phase Oscillator and PWM Waveforms
The RSFF is reset dominant allowing both phases to go to zero duty cycle within a few tens of nanoseconds in
response to a load step decrease. Phases can overlap and go to 100% duty cycle in response to a load step increase
with turn-on gated by the clock pulses. An Error Amplifier output voltage greater than the common mode input range of
the PWM comparator results in 100% duty cycle regardless of the voltage of the PWM ramp. This arrangement
guarantees the Error Amplifier is always in control and can demand 0 to 100% duty cycle as required. It also favors
response to a load step decrease which is appropriate given the low output to input voltage ratio of most systems. The
inductor current will increase much more rapidly than decrease in response to load transients.
This control method is designed to provide “single cycle transient response” where the inductor current changes in
response to load transients within a single switching cycle maximizing the effectiveness of the power train and
minimizing the output capacitor requirements.
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 the 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
)
CLK1
CLK3
50% INTERNAL OSCILLATOR RAMP
RAMP1 SLOPE = 50mV / % DC
0.6V
FIXED RAMP1
EAOUT
RAMP3
RAMP3 MIN DUTY
CYCLE ADJUST
RAMP3 MAX DUTY
CYCLE ADJUST
THE SHARE ADJUST ERROR AMPLIFIER CAN
CHANGE THE PULSE WIDTH OF RAMPS 2 & 3 FROM
0.5 x RAMP1 TO 2.0 X RAMP1 TO FORCE
CURRENT SHARING.
CLK2
RAMP2
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