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參數(shù)資料
| 型號： | IR3500MPBF |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 中文描述： | XPHASE3TM VR11.0 |
| 文件頁數(shù)： | 10/47頁 |
| 文件大?。?/td> | 778K |
| 代理商： | IR3500MPBF |
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IR3500
Page 10 of 47
June 12, 2007
Frequency and Phase Timing Control
The oscillator and system clock frequency is programmable from 250kHz to 9MHZ by an external resistor (ROSC).
The control IC system clock signal (CLKOUT) is connected to CLKIN of all the phase ICs. The phase timing of the
phase ICs is controlled by the daisy chain loop, where control IC phase clock output (PHSOUT) is connected to the
phase clock input (PHSIN) of the first phase IC, and PHSOUT of the first phase IC is connected to PHSIN of the
second phase IC, etc. and PHSOUT of the last phase IC is connected back to PHSIN of the control IC. During
power up, the control IC sends out clock signals from both CLKOUT and PHSOUT pins and detects the feedback at
PHSIN pin to determine the phase number and monitor any fault in the daisy chain loop. Figure 5 shows the phase
timing for a four phase converter. The switching frequency is set by the resistor ROSC as shown in Figure 23. The
clock frequency equals the number of phase times the switching frequency.
Phase IC1
PWM Latch SET
Control IC CLKOUT
(Phase IC CLKIN)
Control IC PHSOUT
(Phase IC1 PHSIN)
Phase IC 1 PHSOUT
(Phase IC2 PHSIN)
Phase IC 2 PHSOUT
(Phase IC3 PHSIN)
Phase IC 3 PHSOUT
(Phase IC4 PHSIN)
Phase IC4 PHSOUT
(Control IC PHSIN)
Figure 5 - Four Phase Oscillator Waveforms
PWM Operation
The PWM comparator is located in the phase IC. Upon receiving the falling edge of a clock pulse, the PWM latch is
set; the PWM ramp voltage begins to increase; the low side driver is turned off, and the high side driver is then
turned on after the non-overlap time. When the PWM ramp voltage exceeds the error amplifier’s output voltage the
PWM latch is reset. This turns off the high side driver, then turns on the low side driver after the non-overlap time,
and activates the ramp discharge clamp. The ramp discharge clamp quickly discharges the PWM ramp capacitor to
the output voltage of the share adjust amplifier in the phase IC until the next clock pulse.
The PWM latch is reset dominant allowing all 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 up 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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IR3500MTRPBF | XPHASE3TM VR11.0 & AMD PVID CONTROL IC |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IR3500MTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 COMPLETE VR11.0 OR AMD PVID PWR SOLTION RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3500V | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 X-PHASE IR3500V AMD SVID CTRL IC RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| IR3502 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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