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| 型号： | ISL8120EVAL3Z |
| 厂商： | Intersil |
| 文件页数： | 29/35页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL8120 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 1.2V，1.2V |
| 电流 - 输出： | 2 x 25A 或 1 x 50A |
| 输入电压： | 3 ~ 22 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 150kHz ~ 1.5MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL8120 |
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ISL8120
VCC
VSEN1/2- COM1/2
VSEN2-
COM1/2
VSEN1/2- COM1/2
ISET
ISL8120 1
ISET
ISL8120 2
VSEN1+
ISET
ISL8120 3
R ISET1
ISHARE
R ISET2
ISHARE
VSEN1-
ISHARE
R ISET3
R ISHARE1
R ISHARE2
R ISHARE3
SHARE BUS
R ISHARE_ = R ISET_
FIGURE 16. SIMPLIFIED 6-PHASE SINGLE OUTPUT IMPLEMENTATION
The second option for multi-module parallel system is to
have only one signal (ISHARE) wire connection. The signal
wire connection scheme is targeted for a N+1 system, where
each module is a standard one that can be paralleled to build
up power systems with different capacity, and each module
can start-up at different time, and each module can be shut
down and removed without the system shutdown. Figure 15
shows some extra circuits needed for such a parallel module
system (each module with independant voltage feedback
loop where only one analog signal (ISHARE) wire is
connected between the module) besides the circuits shown
ensure the successful start-up of the system with the
individual module starting up at different time. With this
circuitry, each module’s local ISHARE signal is connected to
the system share bus only when it starts switching (finishing
of pre-biased start-up). In addition, when the module is shut
off, its ISHARE signal will be removed from the ISHARE bus.
The validated signal transistors shown in Figure 15 are:
MMBT3904 for Q1 and Q2; 2N7002 for Q3.
With the circuits of Figure 15 implemented, the system can
also be further implemented with the CLKOUT-SYNC
connection to have the modules synchornized and phase-
shifted, which is the third option of system configuration.
However, the lose of CLKOUT signal will cause the
shutdown of the other module receiving the signal.
Compared with the second option (single wire (ISHARE)
connection), this option has one more wire connection, but
In dual mode, the current sharing block for current sharing of
modules with independant voltage loop is disabled.
Overcurrent Protection
The OCP function is enabled at start-up. When both
channels operate independently, the average function is
disabled and generates zero average current (IAVG = 0).
The Channel 2 current (ICS2) is compared with ITRIP
(108μA) as its own independent overcurrent protection and
the 7 clock cycles delay is bypassed. The Channel 1’s
current (ICS1) plus 15μA offset forms a voltage (VISHARE)
with an external resistor R ISHARE and compares with a
precision 1.2V threshold for OCP; while the 108μA OCP
comparator with 7-cycle delay is also activated.
In multiphase operation, the VISHARE represents the average
current of all active channels and compares with the ISHARE
pin precision 1.2V threshold to determine the overcurrent
condition. At the same time, each channel has additional
overcurrent trip point at 108μA with 7-cycle delay for phase
overcurrent protection. This scheme helps protect against loss
of channel(s) in multi-phase mode so that no single channel
could carry more than 108μA in such event. See Figure 13.
Note that it is not necessary for the R ISHARE to be scaled to trip
at the same level as the 108μA OCP comparator if the
application allows. Typically the ISHARE pin average current
protection level should be higher than the phase current
protection level. For instance, when Channel 1 operates
independently, the OC trip set by 1.2V comparator can be lower
than 108μA trip point as shown in Equation 6.
? ---------- + ---------------- ? ? ? ? ? ? ? DCR
---------------- – t MIN_OFF
? N ?
2F SW
R ISEN1 = ----------------------------------------------------------------------------------------------------------------------
all the modules are synchronized and phase-shifted.
In summary, the communication wire connection in parallel
systems offers flexibility. Each configuration option has its
? I OC V OUT 1 – D ?
L
I TRIP
(EQ. 6)
R ISHARE = ---------------
own unique features. The selection of the connections of the
conmmunication wire should be based upon evaluation of
the priorities of system requirements and features, such as
1.2V
I TRIP
R ISET = R ISHARE ? N CNTL
reliability, number of wire connections, synchronizations and
fault tolerance, etc.
29
where N is the number of phases; NCNTL is the number of
the ISL8120 controllers in parallel or multiphase operations;
March 20, 2009
FN6641.0
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