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参数资料
| 型号： | MAX15026CATD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 14TDFN |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2.4MHz |
| 占空比： | 88% |
| 电源电压： | 4.5 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX15026
Low-Cost, Small, 4.5V to 28V Wide Operating
Range, DC-DC Synchronous Buck Controller
C F =
f P 3 =
2 π × R F × F CF
Solving for C F :
1
2 π × R F × f PO × 0 . 75
3) Place a high-frequency pole at f P1 = 0.5 x f SW (to
attenuate the ripple at the switching frequency, f SW )
and calculate C CF using the following equation:
Depending on the location of the ESR zero (f ZO ), use
f P2 to cancel f ZO , or to provide additional attenuation of
the high-frequency output ripple:
1
C × C
C F + C CF
f P3 attenuates the high-frequency output ripple.
C CF =
1
π × R F × f SW
?
1
C F
Place the zeros and poles so the phase margin peaks
around f O .
Ensure that R F >>2/g M and the parallel resistance of R 1 ,
R 2 , and R I is greater than 1/g M . Otherwise, a 180°
Type III Compensation Network
(See Figure 4)
When using a low-ESR tantalum or ceramic type, the
ESR-induced zero frequency is usually above the tar-
geted zero crossover frequency (f O ). Use Type III com-
phase shift is introduced to the response making the
loop unstable.
Use the following compensation procedure:
1) With R F ≥ 10k ? , place the first zero (f Z1 ) at 0.8 x f PO .
pensation. Type III compensation provides three poles
and two zeros at the following frequencies:
f Z 1 =
1
2 π × R F × C F
= 0 . 8 × f PO
f Z 1 =
f Z 2 =
G AI N MOD =
×
( 2 π
1
2 π × R F × C F
1
2 π × C I × ( R 1 + R I )
Two midband zeros (f Z1 and f Z2 ) cancel the pair of
complex poles introduced by the LC filter:
f P1 = 0
So:
V IN
V RAMP
2) The gain of the modulator (GAIN MOD ), comprises
the pulse-width modulator, LC filter, feedback
divider, and associated circuitry at the crossover
frequency is:
f P 2 =
( 2 π × f O ) × L OUT × C OUT
f P1 introduces a pole at zero frequency (integrator) for
nulling DC output voltage errors:
1
2 π × R I × C I
G AI N MOD =
V IN
V RAMP
×
2
1
V OUT
R 1
V OUT
R F
C CF
C F
R 2
V REF
g M
R F
COMP
R I
C I
R 1
C F
C CF
R 2
g M
COMP
V REF
Figure 3. Type II Compensation Network
16
Figure 4. Type III Compensation Network
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15026CETD+ | 功能描述:DC/DC 开关控制器 4.5-28V Synchronous Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15026CETD+G1D | 制造商:Maxim Integrated Products 功能描述:LOW-COST, SMALL, 4.5V TO 28V WIDE OPERATING RANGE, DC-DC SYN - Rail/Tube |
| MAX15026CETD+T | 功能描述:DC/DC 开关控制器 4.5-28V Synchronous Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15026CETD+TG1D | 制造商:Maxim Integrated Products 功能描述:LOW-COST, SMALL, 4.5V TO 28V WIDE OPERATING RANGE, DC-DC SYN - Tape and Reel |
| MAX15026CETD+TW | 制造商:Maxim Integrated Products 功能描述:LOW-COST SMALL 4.5V TO 28V WIDE OPERATING RANGE DC-DC CONT - Tape and Reel |
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