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参数资料
| 型号： | MAX1962EEP |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 2.35V to 5.5V, 0.5% Accurate, 1MHz PWM Step-Down Controllers with Voltage Margining |
| 中文描述： | SWITCHING CONTROLLER, 1120 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | QSOP-20 |
| 文件页数： | 18/29页 |
| 文件大小： | 455K |
| 代理商： | MAX1962EEP |
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M
A small capacitor C
F
, can also be added from COMP to
GND to provide high-frequency decoupling. C
F
will add
another high-frequency pole (f
PHF
) to the error-amplifier
response. This pole should be greater than 100 times
the error-amplifier zero frequency to have negligible
impact on the phase margin. This pole should also be
less than half the switching frequency for effective
decoupling:
100f
ZEA
< f
PHF
< 0.5f
S
Select a value for f
PHF
in the range given above, then
solve for C
F
using the following equation:
Below is a numerical example to calculate compensa-
tion values:
V
IN
= 3.3V
V
RAMP
= 0.85V
V
OUT
= 1.8V
V
FB
= 0.8V
I
OUT(max)
= 15A
C
O
= 2 x 680μF = 1360μF
ESR = 0.008
/ 2 = 0.004
L
O
= 0.22μH
g
mEA
= 2mS
f
S
= 1MHz
Choose the crossover frequency (f
C
) in the range f
ZESR
< f
C
< f
S
/5:
29.3kHz < f
C
< 200kHz
Select f
C
= 100kHz, this meets the criteria above, and the
bandwidth is high enough for good transient response.
The power modulator gain at f
C
is:
Choose R
1
= 8.06k
, then R
2
= 10k
(see the
Setting
the Output Voltage
section):
V
g
V
G
mEA
FB
MOD f
=
11
Select C
C
= 8200pF (nearest standard capacitor
value).
Select f
PHF
in the range 100f
ZEA
< f
PHF
< 0.5f
S
.
184kHz < f
PHF
< 500kHz
Select f
PHF
=
250kHz, then solve for C
F
:
Select the nearest standard capacitor value C
F
= 56pF.
Summary of feedback divider and compensation com-
ponents:
R
1
= 8.06k
R
2
= 10k
R
C
= 11k
C
C
= 8200pF
C
F
= 56pF
Power MOSFET Selection
When selecting a MOSFET, essential parameters
include:
(1) Total gate charge (Q
G
)
(2) Reverse transfer capacitance (C
RSS
)
(3) On-resistance (R
DS(ON)
)
(4) Gate threshold voltage (V
TH(MIN)
)
(5) Turn-on/turn-off times
(6) Turn-on/turn-off delays
C
R
f
k
kHz
pF
F
C
PHF
=
×
×
=
×
×
=
1
2
1
2
11
250
58
π
π
C
R
f
k
pF
C
C
PMOD
=
×
×
=
×
×
=
5
2
5
2
11
9201
7863
π
π
k
C
OUT
=
×
×
=
.
.
. 0 102
0 8
( )
1 8
0 002
G
V
V
f
f
f
k
k
MO( )
IN
RAMP
3
0 85
PMOD
ZESR
(
.
29 3
C
×
(
)
×
.
×
)
100
×
.
=
=
=
2
2
9201
0 102
f
C
R
kHz
ZESR
O
ESR
1
10
=
×
×
=
×
×
=
1
2
2
29 3
1360
6
π
π
.
0 004
f
L
C
kHz
PMOD
O
O
=
×
×
=
×
×
×
×
=
1
2
1
2
9 201
.
0 22
.
10
1360
10
6
6
π
π
C
R
f
F
C
PHF
=
×
×
1
2
π
2.35V to 5.5V, 0.5% Accurate, 1MHz PWM
Step-Down Controllers with Voltage Margining
18
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1962EEP+ | 功能描述:DC/DC 开关控制器 1MHz PWM Step-Down 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 |
| MAX1962EEP+T | 功能描述:DC/DC 开关控制器 1MHz PWM Step-Down 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 |
| MAX1962EEP-T | 功能描述:DC/DC 开关控制器 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 |
| MAX1963AETT120+T | 功能描述:低压差稳压器 - LDO Low Input Voltage 300mA LDO Regulators with RESET in SOT and TDFN RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX1963AETT150+T | 功能描述:低压差稳压器 - LDO Low-Input-Voltage 300mA LDO Regulators with RESET in SOT and TDFN RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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