参数资料
| 型号： | ISL62881CIRTZ |
| 厂商： | Intersil |
| 文件页数： | 12/37页 |
| 文件大小： | 0K |
| 描述： | IC REG PWM SGL PHASE 28TQFN |
| 标准包装： | 75 |
| 应用： | 控制器，Intel IMVP-6.5? |
| 输入电压： | 4.5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.013 V ~ 1.5 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 管件 |
| 配用： | ISL62881CCPUEVAL2Z-ND - EVAL BOARD ISL62881CCPU 28QFN |
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ISL62881C, ISL62881D
CLOCK
VCRM
Theory of Operation
Multiphase R 3? Modulator
VW MASTER CLOCK CIRCUIT
MASTER COMP
CLOCK
The ISL62881C is a single-phase regulator implementing
Intel ? IMVP-6.5 ? protocol. It uses Intersil patented
R 3? (Robust Ripple Regulator ? ) modulator. The R 3?
modulator combines the best features of fixed frequency
PWM and hysteretic PWM while eliminating many of their
shortcomings. Figure 5 conceptually shows the
ISL62881C R 3? modulator circuit, and Figure 6 shows
GMVO
CRM
the operation principles.
R
VW
SLAVE CIRCUIT
CLOCK S PWM
Q
PHASE
L
IL
VO
CO
A current source flows from the VW pin to the COMP pin,
creating a voltage window set by the resistor between
between the two pins. This voltage window is called VW
window in the following discussion.
GM
CRS
VW
VCRM
VCRS
FIGURE 5. R 3? MODULATOR CIRCUIT
H Y S T E R E T IC
W IN D O W
Inside the IC, the modulator uses the master clock circuit
to generate the clocks for the slave circuit. The
modulator discharges the ripple capacitor C rm with a
current source equal to g m V o , where g m is a gain factor.
C rm voltage V crm is a sawtooth waveform traversing
between the VW and COMP voltages. It resets to VW
when it hits COMP, and generates a one-shot clock
signal.
The slave circuit has its own ripple capacitor C rs , whose
voltage mimics the inductor ripple current. A g m
amplifier converts the inductor voltage into a current
COM P
C LO C K
PW M
VW
VCRS
FIGURE 6. R 3? MODULATOR OPERATION PRINCIPLES
IN STEADY STATE
VW
COMP
VCRM
CLOCK
PWM
VW
VCRS
FIGURE 7. R 3? MODULATOR OPERATION PRINCIPLES
IN LOAD INSERTION RESPONSE
12
source to charge and discharge C rs . The slave circuit
turns on its PWM pulse upon receiving the clock signal,
and the current source charges C rs . When C rs voltage
V Crs hits VW, the slave circuit turns off the PWM pulse,
and the current source discharges C rs .
Since the ISL62881C works with V crs , which is large-
amplitude and noise-free synthesized signal, the
ISL62881C achieves lower phase jitter than conventional
hysteretic mode and fixed PWM mode controllers. Unlike
conventional hysteretic mode converters, the ISL62881C
has an error amplifier that allows the controller to
maintain a 0.5% output voltage accuracy.
Figure 7 shows the operation principles during load
insertion response. The COMP voltage rises during load
insertion, generating the clock signal more quickly, so the
PWM pulse turns on earlier, increasing the effective
switching frequency, which allows for higher control loop
bandwidth than conventional fixed frequency PWM
controllers. The VW voltage rises as the COMP voltage
rises, making the PWM pulse wider. During load release
response, the COMP voltage falls. It takes the master
clock circuit longer to generate the next clock signal so
the PWM pulse is held off until needed. The VW voltage
falls as the VW voltage falls, reducing the current PWM
pulse width. This kind of behavior gives the ISL62881C
excellent response speed.
FN7596.0
March 8, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL62881CIRTZ-T | 功能描述:直流/直流开关调节器 1-PHS PWM BUCKG FOR MICROPROC PWR SUPPLY RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62881D | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Single-Phase PWM Regulator for IMVP-6.5a?￠ Mobile CPUs and GPUs |
| ISL62881DHRTZ | 功能描述:直流/直流开关调节器 1 PHS CNTRLR W/INTEG DRVR 32LD 5X5 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62881DHRTZ-T | 功能描述:直流/直流开关调节器 1 PHS CNTRLR W/INTEG DRVR 32LD 5X5 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL62881HRTZ | 功能描述:直流/直流开关调节器 1 PHS PWM BUCKG FOR MICROPROCESR PWR SUP RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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