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参数资料
| 型号： | MAX1761EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/23页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 428kHz |
| 电源电压： | 4.5 V ~ 20 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Small, Dual, High-Efficiency
Buck Controller for Notebooks
V IN
TOFF
ON-TIME
COMPUTE
OUT
Q 1-SHOT
TRIG
Q 1-SHOT
TO DH DRIVER INPUT
TRIG
TON
Q
S
Q
S
TO DL DRIVER INPUT
1-SHOT
R
R
Q
FROM ZERO-CROSSING DETECTOR
FROM CURRENT-LIMIT COMPARATOR
ERROR
REF
AMP
REF
-30%
GAIN
DRIVER
x2
MAX1761
UVP
FEEDBACK
OUT
FROM OUT
SHDN
SHDN
ON/OFF
CONTROL
TIMER
UVP
LATCH
MUX
(SEE FIGURE 12)
FB
FROM FEEDBACK
Figure 3. PWM Controller (One Side Only)
The maximum on-time and minimum off-time, t OFF(MIN) ,
one-shots restrict the continuous-conduction output
voltage. The worst-case dropout performance occurs
with the minimum on-time and the maximum off-time, so
the worst-case duty cycle for V IN = 6V, V OUT1 = 5V is
given by:
Resistive voltage drops in the inductor loop and the
dead-time effect cause switching-frequency variations.
Parasitic voltage losses decrease the effective voltage
applied to the inductor. The MAX1761 compensates by
shifting the duty cycle to maintain the regulated output
voltage. The resulting change in frequency is:
Duty Cycle =
t ON(MIN)
t ON(MIN) + t OFF(MAX)
=
?=
V OUT +V DROP1
t ON (V IN + V DROP2 )
2 . 054 μ s
2 . 054 μ s + 500 ns
= 80 . 4 %
V DROP1 is the sum of the parasitic voltage drops in the
inductor discharge path, including synchronous rectifi-
The duty cycle is ideally determined by the ratio of
input-to-output voltage (Duty Cycle = V OUT /V IN ).
Voltage losses in the loop cause the actual duty cycle
to deviate from this relationship. See the Dropout
Performance section for more information. Equate the
off-time duty cycle restriction to the nonideal input/out-
put voltage duty cycle ratio. Typical units will exhibit
better performance. Operation of any power supply in
dropout will greatly reduce the circuit ’ s transient
response, and some additional bulk capacitance may
be required to support fast load changes.
er, inductor, and PC board resistances; V DROP2 is the
sum of the resistances in the charging path; and t ON is
the on-time calculated by the MAX1761.
In forced PWM mode, the dead-time effect increases
the effective on-time, reducing the switching frequency
as one or both dead times. This occurs only at light or
negative loads when the inductor current reverses.
Under these conditions, the inductor ’ s EMF causes the
switching node of the inductor to go high during the
dead time, extending the effective on-time.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1761EVKIT | 功能描述:DC/DC 开关控制器 Evaluation Kit for the MAX1761 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 |
| MAX1762EUB | 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 |
| MAX1762EUB+ | 功能描述:DC/DC 开关控制器 Step-Down Controller for Notebooks 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 |
| MAX1762EUB+T | 功能描述:DC/DC 开关控制器 Step-Down Controller for Notebooks 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 |
| MAX1762EUB-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 |
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