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參數(shù)資料
| 型號： | IR3009 |
| 廠商： | International Rectifier |
| 英文描述： | 3 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC |
| 中文描述： | 3相皓龍，速龍，或控制IC的VR10.X |
| 文件頁數(shù)： | 20/39頁 |
| 文件大?。?/td> | 693K |
| 代理商： | IR3009 |
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IR3093
Page 20 of 39
07/15/04
2
15
10
2
5
DAC
DAC
C
R
(2)
DAC
SOURCE
C
UP
I
SR
(3)
The oscillator frequency is programmable from 100kHz to 540kHz with an external resistor R
ROSC
as shown in
Figure 6 oscillator generates an internal 50% duty cycle sawtooth signal (Figure 3.) that is used t
o generate 120°
out-of-phase timing pulses to set Phase 1,2 and 3 RS flip-flops. Once the switching frequency is chosen, R
ROSC
can
be determined from the curve in the Typical Operating Characteristics Section.
Soft Start, Over-Current Fault Delay, and Hiccup Mode
The IR3093 has a programmable soft-start function to limit the surge current during converter power-up. A capacitor
connected between the SS/DEL and LGND pins controls soft start timing as well as over-current protection delay
and hiccup mode timing.
Figure 8 depicts the various operating modes of the SS/DEL function. Under a no fault condition, the SS/DEL
capacitor will charge. The SS/DEL charge soft-start duration is controlled by a 60uA charge current which charges
CSS up to 4.0V. The Error Amplifier output is clamped low until SS/DEL reaches 1.1V. The Error Amplifier will then
regulate the converter’s output voltage to match the SS/DEL voltage less the 1.1V offset until it reaches the level
determined by the VID inputs. The PWRGD signal is asserted once the SS/DEL voltage exceeds 3.75V.
Five different faults will immediately cause SS/DEL to begin discharging and set the Fault Latch once SS/DEL is
below 3.75V;
1. VCC Under Voltage Lock Out
2. 5VUVL Under Voltage Lock Out
3. VID=11111x fault
4. Low Enable pin
5. Over Current Condition.
A delay is included if any fault condition occurs after a successful soft start sequence. This is required since
momentary faults can occur as part of normal operation due to load transients such as exciting an over-current
condition or a VID=11111x code while going through VID transitions. If any fault occurs during normal operation, the
SS/DEL capacitor will discharge through a 55uA current sink but will not set the fault latch immediately. If the fault
condition persists long enough for the SS/DEL capacitor to discharge below the 3.75V threshold of the delay
comparator, the Fault latch will be set pulling the Error Amplifier’s output low, inhibiting switching and de-asserting
the PWRGD signal. The SS/DEL capacitor is then discharged through a 6uA discharge current resulting in a long
hiccup duration.
The SS/DEL capacitor will continue to discharge until it reaches 0.265V where the fault latch is reset allowing a
normal soft start to occur. If a fault condition is again encountered during the soft start cycle, the fault latch will be
set without any delay and hiccup mode will begin. During hiccup mode the 10 to 1 charge to discharge ratio results
in a 9.1% hiccup mode duty cycle regardless of at what point a fault condition occurs.
The converter can be disabled if the SS/DEL pin is pulled below 0.9V.
Oscillator Resistor R
ROSC
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