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参数资料
| 型号： | MAX17024ETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DIVIDER PWM 14TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 电源电压： | 2 V ~ 26 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 是 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 85°C |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
Single Quick-PWM Step-Down
Controller with Dynamic REFIN
With most chemistries (polymer, tantalum, aluminum
electrolytic), the actual capacitance value required
relates to the physical size needed to achieve low ESR
and the chemistry limits of the selected capacitor tech-
nology. Ceramic capacitors provide low ESR, but the
capacitance and voltage rating (after derating) are
determined by the capacity needed to prevent V SAG
and V SOAR from causing problems during load tran-
sients. Generally, once enough capacitance is added to
meet the overshoot requirement, undershoot at the ris-
ing load edge is no longer a problem (see the V SAG and
V SOAR equations in the Transient Response section).
Thus, the output capacitor selection requires carefully
balancing capacitor chemistry limitations (capacitance
For a standard 300kHz application, the effective zero
frequency must be well below 95kHz, preferably below
50kHz. With these frequency requirements, standard
tantalum and polymer capacitors already commonly
used have typical ESR zero frequencies below 50kHz,
allowing the stability requirements to be achieved with-
out any additional current-sense compensation. In the
standard application circuit (Figure 1), the ESR needed
to support a 15mV P-P ripple is 15mV / (10A x 0.3) =
5m ? . Two 330μF, 9m ? polymer capacitors in parallel
provide 4.5m ? (max) ESR and 1 / (2 π x 330μF x 9m ? )
= 53kHz ESR zero frequency. See Figure 7.
vs. ESR vs. voltage rating) and cost. See Figure 6.
Output Capacitor Stability Considerations
For Quick-PWM controllers, stability is determined by
the in-phase feedback ripple relative to the switching
frequency, which is typically dominated by the output
ESR. The boundary of instability is given by the fol-
TON
BST
DH
LX
L1
C IN
PWR
INPUT
OUTPUT
owing equation:
f SW
π
≥
1
2 π R EFF C OUT
MAX17024 DL
CS
C OUT
PWR
R EFF = R ESR + R PCB + R COMP
where C OUT is the total output capacitance, R ESR is the
FB
R CS
R ESR C OUT ≥
total equivalent-series resistance of the output capaci-
tors, R PCB is the parasitic board resistance between
the output capacitors and feedback sense point, and
AGND
GND
PWR
PWR
STABILITY REQUIREMENT
1
2f SW
R COMP is the effective resistance of the DC- or AC-cou-
pled current-sense compensation (see Figure 8).
Figure 6. Standard Application with Output Polymer or Tantalum
TON
BST
DH
MAX17024 LX
DL
L1
C IN
PWR
INPUT
C OUT
C LOAD
PCB PARASITIC RESISTANCE
SENSE RESISTANCE FOR EVALUATION
OUTPUT
CS
C COMP
0.1 μ F
PWR
R COMP
100 ?
PWR
OUTPUT VOLTAGE REMOTELY
SENSED NEAR POINT OF LOAD
FB
GND
PWR
STABILITY REQUIREMENT
AGND
PWR
R ESR C OUT ≥
1
2f SW
AND R COMP C COMP ≥
1
f SW
FEEDBACK RIPPLE IN PHASE WITH INDUCTOR CURRENT
Figure 7. Remote-Sense Compensation for Stability and Noise Immunity
18
______________________________________________________________________________________
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相关代理商/技术参数 |
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|---|---|
| MAX17024EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX17024 EVAL KIT - Boxed Product (Development Kits) |
| MAX17026 | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX17028GTJ+ | 功能描述:电压模式 PWM 控制器 Intel GMCH Single Phase PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17028GTJ+T | 功能描述:电压模式 PWM 控制器 Intel GMCH Single Phase PWM Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX1702BEGX | 功能描述:PMIC 解决方案 RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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