参数资料
型号: PRM48BF480T400A00
元件分类: 稳压器
英文描述: 8.33 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, DMA24
封装: ROHS COMPLIANT PACKAGE-24
文件页数: 10/22页
文件大小: 1097K
代理商: PRM48BF480T400A00
Rev. 1.1
12 / 2010
Page 18 of 22
PRM48BF480T400A00
(Formerly VIP0001TFJ)
VI CHIP CORP. (A VICOR COMPANY) 25 FRONTAGE RD. ANDOVER, MA 01810 800-735-6200
10.2.4 Midband Gain Design (R1,R3):
With reference to Figure 27: curve ABC is the:
minimum output voltage in the application
maximum input voltage expected in the application
maximum load
PRM open loop response, and is where the maximum
crossover frequency occurs. In order for the maximum
crossover frequency to occur at the design choice FCMAX,
the compensation gain must be equal and opposite of the
powertrain gain at this frequency. For stability purposes,
the compensation should be in the Mid-band (J-K) at the
crossover. Using Equation [1], the mid-band gain can be
selected appropriately.
10.2.5 Compensation Zero Design (C1):
With reference to Figure 27: curve EFG is the:
maximum output voltage in the application
minimum input voltage expected in the application
minimum load in the application
PRM open loop response, and is where the minimum
crossover frequency FCMIN occurs. Based on stability
criteria, the compensation must be in the mid-band at the
minimum crossover frequency, therefore FCMIN will occur
where EFG is equal and opposite of GMB. C1 can be
selected using Equation [2] so that FZ1 occurs prior to
FCMIN.
Figure 26 – Control circuit example
PRM
TM
Regulator
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