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参数资料
| 型号： | MAX15020ATP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 2A 20TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 36 V |
| 输入电压： | 7.5 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 300kHz ~ 500kHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
2A, 40V Step-Down DC-DC Converter with
Dynamic Output-Voltage Programming
C13
C13
C11
R6
R9
C11
R6
R9
C12
C12
V OUT
R7
V OUT
R7
R8
FB
ERROR
AMPLIFIER
COMP
R8
FB
ERROR
AMPLIFIER
COMP
CLOSED-LOOP
GAIN
SS
ERROR-
SS
CLOSED-LOOP
GAIN
ERROR-
GAIN
(dB)
AMPLIFIER
GAIN
GAIN
(dB)
AMPLIFIER
GAIN
f Z1
f Z2
f C
f P2
f P3
FREQUENCY (Hz)
f Z1
f Z2
f P2
f C
f P3 FREQUENCY (Hz)
Figure 3. Error-Amplifier Compensation Circuit (Closed-Loop
and Error-Amplifier Gain Plot) for Ceramic Capacitors
Figure 4. Error-Amplifier Compensation Circuit (Closed-Loop
and Error-Amplifier Gain Plot) for Higher ESR Output Capacitors
Compensation when f C > f ZESR
For larger ESR capacitors such as tantalum and alu-
minum electrolytics, f ZESR can occur before f C . If f ZESR
< f C , then f C occurs between f P2 and f P3 . f Z1 and f Z2
R 6 =
R 9 × 10 × f LC 2
f C 2
remain the same as before, however, f P2 is now set
C11 is then calculated as:
equal to f ZESR . The output capacitor’s ESR zero fre-
quency is higher than f LC but lower than the closed-
loop crossover frequency. The equations that define
C 11 =
C OUT × ESR
R 6
the error amplifier’s poles and zeros (f Z1 , f Z2 , f P1 , f P2 ,
and f P3 ) are the same as before. However, f P2 is now
lower than the closed-loop crossover frequency. Figure
Since R7 >> R6, R7 + R6 can be approximated as R7.
R7 is then calculated as:
4 shows the error-amplifier feedback as well as its gain
response for circuits that use higher-ESR output capac-
itors (tantalum or aluminum electrolytic).
R 7 =
1
2 π × f LC × C 11
C 12 =
C 13 =
Pick a value for the feedback resistor R9 in Figure 4
(values between 1k Ω and 10k Ω are adequate).
C12 is then calculated as:
1
2 π × 0 . 8 × f LC × R 9
The error-amplifier gain between f P2 and f P3 is approxi-
mately equal to R9 / R6 (given that R6 << R7). R6 can
then be calculated as:
f P3 is set at 5 x f C . Therefore, C13 is calculated as:
C 12
2 π × C 12 × R 9 × f P 3 ? 1
Based on the calculations above, the following com-
pensation values are recommended when the switch-
ing frequency of DC-DC converter ranges from 100kHz
to 500kHz. ( Note: The compensation parameters in
Figure 2 are strongly recommended if the switching
frequency is from 300kHz to 500kHz. )
______________________________________________________________________________________
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| MAX15021ATI+ | 功能描述:直流/直流开关调节器 Dual 4A/2A 4MHz w/Tracking/Seq 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 |
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