参数资料
| 型号： | ZL2008ALAFT1 |
| 厂商： | Intersil |
| 文件页数： | 33/42页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 36-QFN |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.4MHz |
| 占空比： | 95% |
| 电源电压： | 3 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 36-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ZL2008
3.3V - 5V
C IN
V IN
The ISHARE_CONFIG command is used to configure the device
for active current sharing. The default setting is a stand-alone
non-current sharing device. A current sharing rail can be part of a
DDC
ZL
C IN
C OUT
system sequencing group.
For fault configuration, the current share rail is configured in a
quasi-redundant mode. In this mode, when a member device
fails, the remaining members will continue to operate and
attempt to maintain regulation. Of the remaining devices, the
device with the lowest member position will become the
DDC
ZL
C OUT
V OUT
reference. If fault spreading is enabled, the current share rail
failure is not broadcast until the entire current share rail fails.
Up to eight (8) devices can be configured in a given current
sharing rail.
C IN
TABLE 28. Current Share Position Settings
DDC
ZL
C OUT
R CFG2
(k Ω )
Current Share Position
Current Sense
10
0
FIGURE 22. Current Sharing Group
11
12.1
1
2
13.3
14.7
3
4
DCR
V REFERENCE
-R
16.2
17.8
5
6
V MEMBER
-R
19.6
42.2
46.4
51.1
7
0
1
2
I MEMBER
I OUT
I REFERENCE
56.2
61.9
3
4
RDS
FIGURE 23. Active Current Sharing
Upon system start-up, the device with the lowest member
position as selected in ISHARE_CONFIG is defined as the
reference device. The remaining devices are members. The
reference device broadcasts its current over the DDC bus. The
members use the reference current information to trim their
voltages (V MEMBER ) to balance the current loading of each device
in the system.
68.1
75
82.5
5
6
7
TABLE 29. Current Share Pin-strap Settings
Current Share # of
Figure 23 shows that, for load lines with identical slopes, the
member voltage is increased towards the reference voltage
which closes the gap between the inductor currents.
The relation between reference and member current and voltage
is given by Equation 36:
CFG0 Pin
LOW
OPEN
HIGH
NLR
1.5%
Disabled
2%
Members
0
Current Sharing
Disabled
V MEMBER = V OUT + R × ( I REFERENCE ? I MEMBER )
where R is the value of the droop resistance.
33
(EQ. 36)
FN6859.4
April 29, 2011
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