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参数资料
| 型号： | ISL6532AEVAL1 |
| 厂商： | Intersil |
| 文件页数： | 2/9页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD 1 ISL6532A |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，DDR 存储器电源 |
| 输出及类型： | 3，非隔离 |
| 输出电压： | 1.25V，1.5V，2.5V |
| 输入电压： | 5V，12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 250kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL6532A |
Application Note 1056
Power Up and State Transitions
There are several distinct state transitions that the ISL6532A
supports. These include a Cold/Mechanical Start (S5 to S0
state transition), Active to Sleep (S0 to S3 transition), Sleep
to Active (S3 to S0 transition) and finally Active to Shutdown
(S0 to S5 transition). Table 1 shows the switch positions and
the corresponding ACPI states.
TABLE 1. ISL6532AEVAL1 STATES
Active to Sleep State Transition
Figure 2 shows the transition from Active to Sleep. Refer to
Table 1 for proper switch positions to achieve this state
transition. When transitioning from Active State to Sleep
State, it is important that the load on the V DDQ rail be
reduced to levels that the standby LDO is capable of
supporting. If the load on V DDQ is excessive, V DDQ voltage
will collapse.
ATX
S3
S5
STATE
ON
ON
ON
Active
S3
Active
Active
Active
S5
Active (S0)
Sleep (S3)
Shutdown (S5)
S3
5VATX
12VATX
If the ATX switch toggled to OFF while the system is in either
Active of Sleep state, the ISL6532A will revert to an S3
(Sleep) state. When either the S3 or S5 switch is toggled
from ACTIVE to the corresponding sleep state, there is
circuitry on the evaluation board that will force the ATX
supply OFF
Initial Power Up - Cold Start
There are two ways to initiate a Cold Start on the
V DDQ
V AGP
V TT
PGOOD
2ms/DIV
ISL6532AEVAL1. Prior to applying power to the ATX supply,
the S5 and S3 switch toggles should be pointing to “ACTIVE”
while the ATX switch toggle is pointing to “OFF”. After
5VATX @ 1V/DIV
12VATX @ 3V/DIV
PGOOD @ 5V/DIV
V DDQ @ 1V/DIV
V AGP @ 1V/DIV
V TT @ 1V/DIV
applying power to the ATX supply, the ISL6532A can be
Cold Started be engaging the ATX switch to “ON”. The
second method requires the system to be in Shutdown state,
with the ATX switch “ON”, the S3 switch “ACTIVE” and the
S5 switch in “S5”. After engaging the S5 switch to “ACTIVE”,
the system will Cold Start. Figure 1 shows a Cold Start.
FIGURE 2. ACTIVE TO SLEEP TRANSITION
Sleep to Active State Transition
Figure 3 shows the transition from Sleep to Active State.
Refer to Table 1 for proper switch positions to achieve this
state transition. Once the PGOOD signal has been asserted,
the V DDQ rail can then be loaded beyond the S3 load
limitations of the standby LDO.
S5
S3
5VSBY
S3
5VATX
5VATX
12VATX
PGOOD
V DDQ
V AGP
V TT
12VATX
V DDQ
V AGP
V TT
10ms/DIV
5VSBY @ 1V/DIV
V DDQ @ 1V/DIV
PGOOD
V AGP @ 1V/DIV
V TT @ 1V/DIV
5VATX @ 1V/DIV
12VATX @ 3V/DIV
PGOOD @ 5V/DIV
5ms/DIV
5VATX @ 1V/DIV V DDQ @ 1V/DIV
12VATX @ 3V/DIV V AGP @ 1V/DIV
FIGURE 1. COLD/MECHANICAL START
PGOOD @ 5V/DIV
V TT @ 1V/DIV
FIGURE 3. SLEEP TO ACTIVE TRANSITION
2
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