参数资料
型号: IR3514MTRPBF
厂商: International Rectifier
文件页数: 36/46页
文件大小: 0K
描述: IC XPHASE3 CONTROL HYBRD 40-MLPQ
产品变化通告: (EP) Parts Discontinuation 25/May/2012
标准包装: 1
系列: XPhase3™
应用: 处理器
安装类型: 表面贴装
封装/外壳: 40-MLPQ
供应商设备封装: 40-MLPQ(6x6)
包装: 标准包装
产品目录页面: 1383 (CN2011-ZH PDF)
其它名称: IR3514MTRPBFDKR
IR3514
Type III Compensation for AVP Applications
Determine the compensation at no load, the worst case condition. Assume the time constant of the resistor and
capacitor across the output inductors matches that of the inductor, the crossover frequency and phase margin of
the voltage loop can be estimated by (25) and (26), where R LE is the equivalent resistance of inductor DCR.
f C 1
R DRP
2 S * C E   G CS * R FB   R LE
(25)
T C 1
90   A tan( 0 . 5 )  
180
S
(26)
Choose the desired crossover frequency fc around fc1 estimated by (25) or choose fc between 1/10 and 1/5 of
the switching frequency per phase, and select the components to ensure the slope of close loop gain is -20dB
/Dec around the crossover frequency. Choose resistor R FB1 according to (27), and determine C FB and C DRP from
(28) and (29).
R FB 1
1
2
R FB
to
R FB 1
2
3
R FB
(27)
C FB
C DRP
1
4 S   f C   R FB 1
( R FB   R FB 1 )   C FB
R DRP
(28)
(29)
R CP and C CP have limited effect on the crossover frequency, and are used only to fine tune the crossover
frequency and transient load response. Determine R CP and C CP from (30) and (31).
R CP
C CP
( 2 S   f C ) 2   L E   C E   R FB   5
V I
10   L E   C E
R CP
(30)
(31)
WKH VZLWFKLQJ IUHTXHQF SHU SKDVH DQG VHOHFW WKH GHVLUHG SKDVH PDUJLQ F  &DOFXODWH . IDFWRU IURP       DQG
C CP1 is optional and may be needed in some applications to reduce the jitter caused by the high frequency noise.
A ceramic capacitor between 10pF and 220pF is usually enough.
Type III Compensation for Non-AVP Applications
Resistor R DRP and capacitor C DRP are not needed. Choose the crossover frequency fc between 1/10 and 1/5 of
determine the component values based on (33) to (37),
tan[   ( C   1 . 5 )]
K
4 180
S T
(32)
R CP
R FB  
( 2 S   L E   C E   f C ) 2   5
V I   K
(33)
C CP
C CP 1
Page 36 of 46
K
2 S   f C   R CP
1
2 S   f C   K   R CP
(34)
(35)
10/30/2007
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