- 您现在的位置：买卖IC网 > PDF目录21684 > MAX17410GTM+T (Maxim Integrated)IC CTLR QPWM 2PH FOR IMV 48TQFN PDF资料下载
参数资料
| 型号： | MAX17410GTM+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 35/45页 |
| 文件大小： | 0K |
| 描述： | IC CTLR QPWM 2PH FOR IMV 48TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页当前第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页
Dual-Phase, Quick-PWM Controller
for IMVP6+ CPU Core Power Supplies
I LOAD ( SKIP ) = η TOTAL ? SW OUT ? ? IN OUT ?
Light-Load Pulse-Skipping Operation
(Deeper Sleep)
When DPRSLPVR is pulled high, the MAX17410 oper-
ates with a single-phase pulse-skipping mode. The
pulse-skipping mode enables the driver’s zero-crossing
comparator, so the controller pulls DL1 low when its cur-
rent-sense inputs detect “zero” inductor current. This
keeps the inductor from discharging the output capaci-
tors and forces the controller to skip pulses under light
load conditions to avoid overcharging the output.
When pulse-skipping, the controller blanks the upper
PWRGD and CLKEN thresholds, and also blanks
PHASEGD high impedance. Upon entering pulse-
skipping operation, the controller temporarily sets the
OVP threshold to 1.80V, preventing false OVP faults
when the transition to pulse-skipping operation coin-
cides with a VID code change. Once the error amplifier
detects that the output voltage is in regulation, the OVP
threshold tracks the selected VID DAC code. The
MAX17410 automatically uses forced-PWM operation
during soft-start and soft-shutdown, regardless of the
DPRSLPVR and PSI configuration.
Automatic Pulse-Skipping Switchover
In skip mode (DPRSLPVR = high), an inherent automatic
switchover to PFM takes place at light loads (Figure 8).
This switchover is affected by a comparator that trun-
input range of 7V to 20V, this threshold is relatively con-
stant, with only a minor dependence on the input volt-
age due to the typically low duty cycles. The total load
current at the PFM/PWM crossover threshold
(I LOAD(SKIP) ) is approximately:
? t V ? ? V - V ?
? L ? ? V IN ?
where η TOTAL is the number of active phases.
The switching waveforms may appear noisy and asyn-
chronous when light loading activates pulse-skipping
operation, but this is a normal operating condition that
results in high light-load efficiency. Trade-offs between
PFM noise and light-load efficiency are made by varying
the inductor value. Generally, low inductor values pro-
duce a broader efficiency vs. load curve, while higher
values result in higher full-load efficiency (assuming that
the coil resistance remains fixed) and less output volt-
age ripple. Penalties for using higher inductor values
include larger physical size and degraded load-tran-
sient response, especially at low input voltage levels.
cates the low-side switch on-time at the inductor cur-
rent ’s zero crossing. The zero-crossing comparator
senses the inductor current across the low-side
MOSFETs. Once V LX drops below the zero-crossing
comparator threshold (see the Electrical Characteristics
Δ i
Δ t
=
V IN - V OUT
L
I PEAK
table), the comparator forces DL low (Figure 2). This
mechanism causes the threshold between pulse-skip-
ping PFM and non-skipping PWM operation to coincide
with the boundary between continuous and discontinu-
ous inductor-current operation. The PFM/PWM
I LOAD = I PEAK /2
crossover occurs when the load current of each phase
is equal to 1/2 the peak-to-peak ripple current, which is
0
ON-TIME
TIME
a function of the inductor value (Figure 8). For a battery
Figure 8. Pulse-Skipping/Discontinuous Crossover Point
______________________________________________________________________________________
35
相关PDF资料 |
PDF描述 |
|---|---|
| BAV99W,115 | DIODE ARRAY 100V 130MA SOT323 |
| ATS049B | CRYSTAL 4.9152 MHZ 18PF |
| ATS221B | CRYSTAL 22.1184 MHZ 18 PF FUND |
| ATS20A | CRYSTAL 20.0 MHZ 20 PF FUND |
| ATS073B | CRYSTAL 7.3728 MHZ 18 PF FUND |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17411GTM+ | 功能描述:电流型 PWM 控制器 IMVP7 CPU & Graphics Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411GTM+T | 功能描述:电流型 PWM 控制器 IMVP7 CPU & Graphics Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411RGTM+ | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411RGTM+T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX17411RGTM+TW | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
发布紧急采购，3分钟左右您将得到回复。