參數(shù)資料
型號(hào)： IR3088A
廠商： International Rectifier
英文描述： XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT
中文描述： XPHASETM相集成電路及超溫故障檢測
文件頁數(shù)： 7/34頁
文件大小： 1264K
代理商： IR3088A
IR3088A
PWM Control Method
The PWM block diagram of the
XPhase
TM
architecture is shown in Figure 2. Feed-forward voltage mode control with
trailing edge modulation is used. A high-gain wide-bandwidth voltage type error amplifier in the Control IC is used for
the voltage control loop. An external RC circuit connected to the input voltage and ground is used to program the
slope of the PWM ramp and to provide the feed-forward control at each phase. The PWM ramp slope will change
with the input voltage and automatically compensate for changes in the input voltage. The input voltage can change
due to variations in the silver box output voltage or due to the wire and PCB-trace voltage drop related to changes in
load current.
+
-
10K
+
-
SHARE
ADJUST
ERROR
AMPLIFIER
CURRENT
SENSE
AMPLIFIER
X34
X
0.91
20mV
+
-
+
-
+
-
10K
SHARE
ADJUST
ERROR
AMPLIFIER
CURRENT
SENSE
AMPLIFIER
X34
20mV
X
0.91
+
-
+
-
+
-
+
-
+
-
DACIN
PWMRMP
BIASIN
RAMPIN-
RAMPIN+
GATEH
SCOMP
ISHARE
CSIN+
GATEL
EAIN
CSIN-
SYSTEM
REFERENCE
VOLTAGE
ENABLE
CLOCK
PULSE
GENERATOR
BODY
BRAKING
COMPARATOR
RAMP
DISCHARGE
CLAMP
PWM
LATCH
S
RESET
DOMINANT
PHASE IC
R
PWM
COMPARATOR
RDRP
RPWMRMP
RPHS2
CSCOMP
+
-
RPHS1
+
-
+
-
RCS
RVFB
+
-
CPWMRMP
CSCOMP
CCS
RPWMRMP
RCS
+
-
CPWMRMP
+
-
+
-
CCS
RPHS2
RPHS1
+
-
GND
VOUT
BIASIN
VDAC
VBIAS
DACIN
PWMRMP
RAMPIN+
VOSNS-
VOSNS+
VOSNS-
ISHARE
RAMPIN-
IIN
VDRP
EAIN
GATEH
SCOMP
CSIN-
CSIN+
GATEL
EAOUT
RMPOUT
VIN
FB
IROSC
SYSTEM
REFERENCE
VOLTAGE
VDAC
BODY
BRAKING
COMPARATOR
RAMP
DISCHARGE
CLAMP
ENABLE
CLOCK
PULSE
GENERATOR
VBIAS
REGULATOR
IFB
VDRP
AMP
50%
DUTY
CYCLE
RAMP GENERATOR
VVALLEY
VPEAK
ERROR
AMP
R
S
RESET
DOMINANT
PWM
LATCH
PHASE IC
COUT
CONTROL IC
PWM
COMPARATOR
Figure 2. PWM Block Diagram
Frequency and Phase Timing Control
An oscillator with programmable frequency is located in the Control IC. The output of the oscillator is a 50% duty
cycle triangle waveform with peak and valley voltages of approximately 5V and 1V respectively. This signal is used to
program both the switching frequency and phase timing of the Phase ICs. The Phase IC is programmed by resistor
divider R
PHS1
and R
PHS2
connected between the VBIAS reference voltage and the Phase IC LGND pin. A
comparator in the Phase ICs detects the crossing of the oscillator waveform over the voltage generated by the
resistor divider and triggers a clock pulse that starts the PWM cycle. The peak and valley voltages track the VBIAS
voltage reducing potential Phase IC timing errors. Figure 3 shows the Phase timing for an 8 phase converter. Note
that both slopes of the triangle waveform can be used for phase timing by swapping the RMPIN+ and RMPIN– pins,
as shown in Figure 2.
Page 7 of 34
9/30
/04
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IR3088A_05 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT
IR3088AM 制造商:IRF 制造商全稱:International Rectifier 功能描述:XPHASETM PHASE IC WITH FAULT AND OVERTEMP DETECT
IR3088AMPBF 功能描述:IC XPHASE CONTROL 20L-MLPQ RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase™ 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
IR3088AMTR 功能描述:IC XPHASE W/FAULT DET 20L-MLPQ RoHS:否 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:XPhase™ 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件
IR3088AMTRPBF 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 XPHASE IC W/ FAULT OVERTEMP DETECT 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(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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