参数资料
型号: ISL62771HRTZ-T
厂商: Intersil
文件页数: 18/36页
文件大小: 0K
描述: IC PWM CTRLR MULTIPHASE 40TQFN
标准包装: 6,000
系列: Robust Ripple Regulator™ (R³)
应用: 控制器,AMD Fusion? SVI 2.0 CPU GPU
输入电压: 4.5 V ~ 25 V
输出数: 2
输出电压: 0.006 V ~ 1.55 V
工作温度: -10°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 40-WFQFN 裸露焊盘
供应商设备封装: 40-TQFN-EP(5x5)
包装: 带卷 (TR)
ISL62771
balancing circuit recommended for ISL62771. The current
sensing traces should be routed to the inductor pads so they only
pick up the inductor DCR voltage. Each ISEN pin sees the average
voltage of two sources: its own, phase inductor phase-node pad,
and the other phase inductor output side pad. Equations 8
through 9 give the ISEN pin voltages:
REP RATE = 10kHz
V ISEN1 = V 1p + V 2n
V ISEN2 = V 1n + V 2p
The ISL62771 will make V ISEN1 = V ISEN2 as shown in
Equation 10:
(EQ. 8)
(EQ. 9)
V 1p + V 2n = V 1n + V 2p
Rewriting Equation 10 gives Equation 11:
V 1p – V 1n = V 2p – V 2n
Therefore:
R dcr1 × I L1 = R dcr2 × I L2
(EQ. 10)
(EQ. 11)
(EQ. 12)
REP RATE = 25kHz
Current balancing (I L1 = I L2 ) is achieved when R dcr1 = R dcr2 .
R pcb1 and R pcb2 do not have any effect.
Since the slave ripple capacitor voltages mimic the inductor
currents, the R 3 ? modulator can naturally achieve excellent
current balancing during steady state and dynamic operations.
Figure 16 shows the current balancing performance of the
evaluation board with load transient of 12A/51A at different rep
rates. The inductor currents follow the load current dynamic
change with the output capacitors supplying the difference. The
inductor currents can track the load current well at a low
repetition rate, but cannot keep up when the repetition rate gets
into the hundred-kHz range, where it is out of the control loop
bandwidth. The controller achieves excellent current balancing in
all cases installed.
18
REP RATE = 50kHz
REP RATE = 100kHz
REP RATE = 200kHz
FIGURE 16. CURRENT BALANCING DURING DYNAMIC OPERATION.
CH1: I L1 , CH2: I LOAD , CH3: I L2 , CH4: I L3
FN8321.2
September 12, 2013
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ISL62771IRTZ-T 功能描述:IC PWM CTRLR MULTIPHASE 40TQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:Robust Ripple Regulator™ (R³) 标准包装:43 系列:- 应用:控制器,Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN(7x7) 包装:管件
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