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参数资料
| 型号： | MAX1964TEEE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/30页 |
| 文件大小： | 0K |
| 描述： | IC POWER CTRLR/SEQUENCER 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 应用： | 电源控制器，序列发生器 |
| 输入电压： | 4.5 V ~ 28 V |
| 电流 - 电源： | 1.25mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 管件 |
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Tracking/Sequencing Triple/Quintuple
Power-Supply Controllers
I PEAK =
V OUT V REF A VEA
V OUT ( NOMINAL ) R DS ( ON ) A VCS
f POLE ( OUT ) =
1
2 π C OUT R LOAD
=
I LOAD ( MAX )
2 π C OUT V OUT
where V REF = 1.24V, A VCS is the current-sense amplifi-
er ’ s gain (4.9 typ), A VEA is the DC gain of the transcon-
ductance error amplifier (2000 typ) set by its DC output
resistance, and V OUT(NOMINAL) is the output voltage
4) The series compensation resistor and capacitor
provide a zero which can be used to cancel the
second pole in order to ensure stability:
set by the feedback resistive-divider (internal or exter-
nal). Since the output voltage is a function of the load
current and load resistance, the total DC loop gain
R COMP ≥
1
2 π C COMP 1 f POLE ( OUT )
A V ( DC ) ≈ ≈
400 × V REF R LOAD
(A V(DC) ) is approximately:
I PEAK V REF R LOAD A VEA
I LOAD V OUT ( NOMINAL ) R DS ( ON ) A VCS
≈
V OUT ( NOMINAL ) R DS ( ON )
5) For most applications using electrolytic capacitors,
the output capacitor ’ s ESR forms a second zero
that occurs before crossover. Applications using
low-ESR capacitors (e.g., polymer, OS-CON) may
have ESR zeros that occur after crossover.
Therefore, verify the frequency of the output capaci-
tor ’ s ESR zero:
The first compensation capacitor (C COMP1 ) creates the
dominant pole. Due to the current-mode control
scheme, the output capacitor also creates a pole in the
f ZERO ( ESR ) ≈
1
2 π C OUT R ESR
system which is a function of the load resistance. As
the load resistance increases, the frequency of the out-
put capacitor ’ s pole decreases. However, the DC loop
gain increases with larger load resistance, so the unity-
gain bandwidth remains fixed. Additionally, the com-
6) Finally, if the output capacitor ’ s ESR zero occurs
before crossover, add the parallel compensation
capacitor (C COMP2 ) to form a third pole to cancel
this second zero:
pensation resistor and the output capacitor ’ s ESR both
generate zeros which must be canceled out by corre-
sponding poles. Therefore, in order to achieve stable
operation, use the following procedure to properly com-
pensate the system:
1) The crossover frequency (the frequency at which
C COMP 2 ≈
≈
C COMP 1
( 2 π R COMP C COMP 1 f ZERO ( ESR ) - 1 )
C COMP 1 f POLE ( OUT )
( f ZERO ( ESR ) - f POLE ( OUT ) )
f C ≤ SW
unity gain occurs) must be less than 1/5th the
switching frequency:
f
5
For example, the MAX1964 Standard Application
Circuit shown in Figure 1 requires a 5V output that sup-
ports up to 2A. Using the above compensation guide-
lines, we can determine the proper component values:
? First, select the crossover frequency to be 1/5th the
2) Determine the series compensation capacitor
(C COMP1 ) required to set the desired crossover fre-
quency:
?
200kHz switching frequency.
Next, determine the total DC loop gain (A V(DC) ) so
you can calculate the series compensation capaci-
tance (C COMP1 ). Since the applications circuit uses
C COMP 1 ≥
1 ? g m A V ( DC ) ?
? ?
2 π ? 2000 f C ?
the International Rectifier IRF7101 with an R DS(ON)
of 100m ? , the DC loop gain approximately equals
2480 and C COMP1 must be approximately 490pF.
where the error amplifier ’ s transconductance (g m )
is 100μS (see Electrical Characteristics ) and A V(DC)
is the total DC loop gain defined above.
3) Before crossover occurs, the output capacitor and
the load resistor generate a second pole:
?
Select the closest standard capacitor value of
470pF.
Determine the location of the output pole
(f POLE(OUT) ). With a 5V output supplying 2A and a
1000μF electrolytic capacitor, the output pole
occurs at 64Hz.
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1964TEEE+ | 功能描述:电流和电力监控器、调节器 Track/Seq Trpl/Wuint Power-Supply Ctlr RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1964TEEE+T | 功能描述:电流和电力监控器、调节器 Track/Seq Trpl/Wuint Power-Supply Ctlr RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1964TEEE-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1965TEEP | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1965TEEP-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
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