参数资料
| 型号： | ISL6277IRZ-T |
| 厂商： | Intersil |
| 文件页数： | 27/37页 |
| 文件大小： | 0K |
| 描述： | IC PWM REG MULTIPH AMD 48-QFN |
| 标准包装： | 4,000 |
| 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： | -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（6x6） |
| 包装： | 带卷 (TR) |
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ISL6277
Thermal Monitor [NTC, NTC_NB]
The ISL6277 features two thermal monitors which use an
Table 13 summarizes the fault protections.
TABLE 13. FAULT PROTECTION SUMMARY
external resistor network which includes an NTC thermistor to
monitor motherboard temperature and alert the AMD CPU of a
thermal issue. Figure 20 shows the basic thermal monitor circuit
on the Core VR NTC pin. The Northbridge VR features the same
thermal monitor. The controller drives a 30μA current out of the
NTC pin and monitors the voltage at the pin. The current flowing
out of the NTC pin creates a voltage that is compared to a
warning threshold of 640mV. When the voltage at the NTC pin
falls to this warning threshold or below, the controller asserts
VR_HOT_L to alert the AMD CPU to throttle back load current to
stabilize the motherboard temperature. A thermal fault counter
begins counting toward a minimum shutdown time of 100μs.
The thermal fault counter is an up/down counter, so if the
voltage at the NTC pin rises above the warning threshold, it will
count down and extend the time for a thermal fault to occur. The
warning threshold does have 20mV of hysteresis.
FAULT TYPE
Overcurrent
Phase Current
Unbalance
Way-Overcurrent
(1.5xOC)
Undervoltage
-325mV
Overvoltage
+325mV
FAULT DURATION
BEFORE
PROTECTION
7.5μs to 11.5μs
1ms
Immediately
PROTECTION
ACTION
PWM tri-state,
PGOOD latched
low
PGOOD latched
low.
PWM tri-state.
PGOOD latched
low.
Actively pulls the
output voltage to
FAULT
RESET
ENABLE
toggle or
VDD toggle
If the voltage at the NTC pin continues to fall down to the
shutdown threshold of 580mV or below, the controller goes into
below VID value,
then tri-state.
shutdown and triggers a thermal fault. The PGOOD pin is pulled
low and tri-states the power MOSFETs. A fault on either side will
shutdown both VRs.
NTC Thermal
100μs min
PGOOD latched
low.
PWM tri-state.
Fault Recovery
INTERNAL TO
ISL6277
All of the previously described fault conditions can be reset by
bringing ENABLE low or by bringing VDD below the POR
30μA
VR_HOT_L
+V
R
threshold. When ENABLE and VDD return to their high operating
levels, the controller resets the faults and soft-start occurs.
Interface Pin Protection
NTC
The SVC and SVD pins feature protection diodes which must be
R p
+
V NTC
-
R NTC
R s
MONITOR
WARNING SHUTDOWN
640mV 580mV
considered when removing power to VDD and VDDIO, but leaving
it applied to these pins. Figure 21 shows the basic protection on
the pins. If SVC and/or SVD are powered but VDD is not, leakage
current will flow from these pins to VDD.
INTERNAL TO
FIGURE 20. CIRCUITRY ASSOCIATED WITH THE THERMAL MONITOR
ISL6277
FEATURE OF THE ISL6277
VDD
As the board temperature rises, the NTC thermistor resistance
decreases and the voltage at the NTC pin drops. When the
voltage on the NTC pin drops below the over-temperature trip
threshold, then VR_HOT is pulled low. The VR_HOT signal is used
to change the CPU operation and decrease power consumption.
With the reduction in power consumption by the CPU, the board
temperature decreases and the NTC thermistor voltage rises.
Once the over-temperature threshold is tripped and VR_HOT is
taken low, the over-temperature threshold changes to the reset
level. The addition of hysteresis to the over-temperature
threshold prevents nuisance trips. Once both pin voltages exceed
the over-temperature reset threshold, the pull-down on VR_HOT
is released. The signal changes state and the CPU resumes
normal operation. The over-temperature threshold returns to the
trip level.
27
SVC, SVD
GND
FIGURE 21. PROTECTION DEVICES ON THE SVC AND SVD PINS
FN8270.1
March 8, 2012
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