参数资料
型号: ZL2008ALAFT
厂商: Intersil
文件页数: 25/42页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 36-QFN
标准包装: 100
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:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-VFQFN 裸露焊盘
包装: 带卷 (TR)
ZL2008
Otherwise f SW (D) = f PROG
TABLE 20. UVLO Threshold Resistor Settings
This is illustrated in Figure 18. Due to quantizing effects inside
the IC, the ZL2008 will decrease its frequency in steps between
f SW and f MIN . The quantity and magnitude of the steps will
depend on the difference between f SW and f MIN as well as the
frequency range.
Adaptive frequency mode is not available for current sharing
groups when using an external clock, or if the device is outputting
a clock signal on its SYNC pin.
Power Management Functional
Description
Input Undervoltage Lockout
The input undervoltage lockout (UVLO) prevents the ZL2008 from
operating when the input falls below a preset threshold,
indicating the input supply is out of its specified range. The UVLO
threshold (V UVLO ) can be set between 2.85V and 16V using the
UVLO pin. The simplest implementation is to connect the UVLO
pin as shown in Table 19. If the UVLO pin is left unconnected, the
UVLO threshold will default to 4.5V.
TABLE 19. UVLO Threshold Pin-strap Settings
UVLO Threshold
R UVLO
(k Ω )
17.8
19.6
21.5
23.7
26.1
28.7
31.6
34.8
38.3
42.2
46.4
51.1
56.2
61.9
68.1
UVLO
(V)
2.85
3.14
3.44
3.79
4.18
4.59
5.06
5.57
6.13
6.75
7.42
8.18
8.99
9.9
10.9
UVLO Pin
LOW
OPEN
HIGH
(V)
3
4.5
10.8
75
82.5
90.9
100
12
13.2
14.54
16
If the desired UVLO threshold is not one of the listed choices, the
user can configure a threshold between 2.85V and 16V by
connecting a resistor between the UVLO pin and SGND by
selecting the appropriate resistor from Table 20.
25
The UVLO voltage can also be set to any value between 2.85V
and 16V via the I 2 C/SMBus interface.
Once an input undervoltage fault condition occurs, the device
can respond in a number of ways as follows:
1. Continue operating without interruption.
2. Continue operating for a given delay period, followed by
shutdown if the fault still exists. The device will remain in
shutdown until instructed to restart.
3. Initiate an immediate shutdown until the fault has been
cleared. The user can select a specific number of retry
attempts.
The default response from a UVLO fault is an immediate
shutdown of the device. The device will continuously check for
the presence of the fault condition. If the fault condition is no
longer present, the ZL2008 will be re-enabled.
FN6859.4
April 29, 2011
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