参数资料
型号: TPS54260DRCR
厂商: Texas Instruments
文件页数: 26/52页
文件大小: 0K
描述: IC REG BUCK ADJ 2.5A 10SON
标准包装: 3,000
系列: SWIFT™, Eco-Mode™
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.8 V ~ 58 V
输入电压: 3.5 V ~ 60 V
PWM 型: 电流模式
频率 - 开关: 100kHz ~ 2.5MHz
电流 - 输出: 2.5A
同步整流器:
工作温度: -40°C ~ 150°C
安装类型: 表面贴装
封装/外壳: 10-VFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-SON 裸露焊盘(3x3)
SLVSA86A – MARCH 2010 – REVISED DECEMBER 2010
DETAILED DESCRIPTION (continued)
www.ti.com
= Adc ′ è
V OUT
V C
? s ?
? 1 + ÷
? s ?
? 1 + ÷
2 p ′ f Z ?
è 2 p ′ f P ?
(14)
Adc = gm ps ′ R L
(15)
C OUT ESR ′ 2 p
f P =
f Z =
1
C OUT ′ R L ′ 2 p
1
′ R
(16)
(17)
Small Signal Model for Frequency Compensation
The TPS54260 uses a transconductance amplifier for the error amplifier and readily supports three of the
commonly-used frequency compensation circuits. Compensation circuits Type 2A, Type 2B, and Type 1 are
shown in Figure 47 . Type 2 circuits most likely implemented in high bandwidth power-supply designs using low
ESR output capacitors. The Type 1 circuit is used with power-supply designs with high-ESR aluminum
electrolytic or tantalum capacitors.. Equation 18 and Equation 19 show how to relate the frequency response of
the amplifier to the small signal model in Figure 47 . The open-loop gain and bandwidth are modeled using the R O
and C O shown in Figure 47 . See the application section for a design example using a Type 2A network with a
low ESR output capacitor.
Equation 18 through Equation 27 are provided as a reference for those who prefer to compensate using the
preferred methods. Those who prefer to use prescribed method use the method outlined in the application
section or use switched information.
V O
R1
VSENSE
gm ea
COMP
Type 2A
Type 2B
Type 1
Vref
R2
R O
C O
R3
C2
R3
C2
C1
C1
Figure 47. Types of Frequency Compensation
26
Product Folder Link(s): TPS54260
Copyright ? 2010, Texas Instruments Incorporated
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