参数资料
型号: ISL8120IRZ-TEC
厂商: Intersil
文件页数: 32/33页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 32-QFN
标准包装: 6,000
PWM 型: 电压模式
输出数: 2
频率 - 最大: 1.5MHz
占空比: 90%
电源电压: 3 V ~ 22 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: 32-VFQFN 裸露焊盘
包装: 带卷 (TR)
ISL8120IR
Figure 25 shows the tolerance of various output voltage
regulation for 1%, 0.5%, and 0.1% feedback resistor
2.5
%min = ( Vref ? ( 1 – Ref% ) – V OS_DA ) ? ? 1 + ---------------------------------------- ?
dividers. Note that the farther the output voltage setpoint
away from the internal reference voltage, the larger the
tolerance; the lower the resistor tolerance (R%), the tighter
the regulation.
? R FB ? ( 1 – R% ) ?
? R OSMAX ?
2.0
1.5
1.0
0.5
0.0
R% = 1%
0.5%
0.1%
R OSMAX = -----------------------------------------------------------------------------------------------------
----------------------------------------- + ----------------------------------------------------
1 1
R OS ? ( 1 + R% ) R DIF ? ( 1 + R DIF % )
1
(EQ. 9)
-0.5
-1.0
-1.5
0.1%
0.5%
%max = ( Vref ? ( 1 – Ref% ) – V OS_DA ) ? ? 1 + ---------------------------------------- ?
? R OSMIN ?
? R FB ? ( 1 – R% ) ?
-2.0
-2.5
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1%
4.5
5.0
R OSMIN = -----------------------------------------------------------------------------------------------
--------------------------------------- + -------------------------------------------------
R OS ? ( 1 – R % ) R DIF ? ( 1 – R DIF % )
1
1 1
(EQ. 10)
OUTPUT VOLTAGE (V)
FIGURE 25. OUTPUT REGULATION WITH DIFFERENT
RESISTOR TOLERANCE FOR REF% = ± 0.6%
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
32
FN6763.2
November 11, 2011
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