- 您现在的位置：买卖IC网 > PDF目录15488 > MAX1858AEEG+ (Maxim Integrated Products)IC REG CTRLR BUCK PWM VM 24-QSOP PDF资料下载
参数资料
| 型号： | MAX1858AEEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 660kHz |
| 电源电压： | 4.5 V ~ 23 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 ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
Dual 180° Out-of-Phase Buck Controllers with
Sequencing/Prebias Startup and POR
At some higher frequency, the output capacitor ’s
impedance becomes insignificant compared to its ESR,
and the LC system becomes more like an LR system,
The following loop-gain equation can be found by using
these previous approximations with Figure 9:
V SET
turning a double pole into a single pole. This zero
occurs at:
A L ?
V IN
V RAMP
× ×
V OUT
g M _ COMP × R COMP × R ESR
sL
f ESR =
1
2 π × R ESR C OUT
Setting the loop gain to 1 and solving for the crossover
frequency yields:
× SET
A final pole is added using C COMP_B to reduce the
gain and attenuate noise after crossover. This pole
(f COMP_B ) occurs at:
f CO = GBW =
V IN
V RAMP
V
V OUT
f COMP _ B =
1
2 π × R COMP C COMP _ B
g M _ COMP × R COMP × R ESR
×
2 π × L
To ensure stability, select R COMP to meet the following
Figure 10 shows a Bode plot of the poles and zeros in
their relative locations.
Near crossover, the following approximations can be
made to simplify the loop-gain equation:
? R COMP has much higher impedance than C COMP .
This is true if, and only if, crossover occurs above
f Z_COMP_A . If this is true, C COMP_A can be ignored
(as a short to ground).
criteria:
? Unity-gain crossover must occur below 1/5th of the
switching frequency.
? For reasonable phase margin using type 1 compen-
sation, f CO must be larger than 5 ? f ESR .
Choose C COMP_A so that f Z_COMP_A equals half f LC
using the following equation:
? R ESR is much higher impedance than C OUT . This is
true if, and only if, crossover occurs well after the out-
put capacitor ’s ESR zero. If this is true, C OUT
C COMP _ A =
2 × LC OUT
R COMP
becomes an insignificant part of the loop gain and can
be ignored (as a short to ground).
Choose C COMP_B so that f COMP_B occurs at 3 times
f CO using the following equation:
( )
? C COMP_B is much higher impedance than R COMP
and can be ignored (as an open circuit). This is true
if, and only if, crossover occurs far below f COMP_B .
C COMP _ B =
1
2 π × 3 × f CO × R COMP
P
DH
N
GAIN = +V IN /V RAMP
W
L
V OUT
L
V C
M
DL
FB
N
LX
R ESR
C OUT
=
COMP_
LX
FB
R ESR
C OUT
COMP_
g M_COMP
g M_COMP
R COMP_
C COMP_A
V SET
R COMP_
C COMP_A
C COMP_B
V SET
C COMP_B
Figure 9. Fixed-Frequency Voltage-Mode Control Loop
18
______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| GBC30DRYH-S93 | CONN EDGECARD 60POS DIP .100 SLD |
| GBC31DRTS-S93 | CONN EDGECARD 62POS DIP .100 SLD |
| MAX1876AEEG+ | IC REG CTRLR BUCK PWM VM 24-QSOP |
| GCC20DRTN-S93 | CONN EDGECARD 40POS DIP .100 SLD |
| MAX1771EPA+ | IC REG CTRLR BST PWM 8-DIP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1858AEEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858AEEG+T | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
| MAX1858AEEG-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 |
| MAX1858EEG | 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 |
| MAX1858EEG+ | 功能描述:电压模式 PWM 控制器 Dual 180 Out Buck Controllers 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 |
发布紧急采购，3分钟左右您将得到回复。