参数资料
| 型号： | MC44605PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO PWM 16DIP |
| 产品变化通告： | Product Obsolescence 19/Dec/2008 |
| 标准包装： | 500 |
| 系列： | GreenLine™ |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 80% |
| 电源电压： | 10 V ~ 15 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 其它名称： | MC44605PGOS |
MC44605
Summary of the Main Design Equations
The following table consists of equations enabling to dimension a multisynchronized SMPS operating in discontinuous
mode.
Pout max is the maximum power the load may draw in normal working.
Pin max +
Pout max
η
The maximum input power Pin max is easily deducted by dividing Pout max by the
efficiency ( η ). In this kind of application, the efficiency is generally taken equal to
80%.
2 ·Vac
min
NVo 2
The inductor value Lp must be chosen lower than Lp max or ideally equal to this
value (to optimize the application design ? in).
2 ·Vac
Lp max +
2
min
Pin max
) NVo
fsync max
In effect, if Lp was higher than Lp max , a synchronized and discontinuous working
could not be guaranteed (in some cases, the demagnetization phase would not be
finished while a new conduction phase should start to follow the synchronization).
min
Ipk max +
2
L
Pin max
fsync
Ipk max is the maximum inductor peak current. This current is obtained when the
power to transfer is maximum at the minimum synchronization frequency (60 W
output, 30 kHz in the proposed application).
min
d max +
Pin max
Lp
Vac
fsync max
d max is the maximum duty cycle. The duty cycle is maximum at the lowest input
voltage when the power demand is maximum while the synchronization frequency
also is maximum.
3
Pon max + 1
Rds on
Ipk max2
d max
Pon max is the maximum MOSFET on ? time losses that are proportional to Ipk max ,
d max and Rds on (on ? time MOSFET resistor).
This conduction losses estimation enables to dimension the power MOSFET.
DS
(V
) max +
2
Vac max ) (N
Vout)
( V DS )max is the maximum voltage the power switch must be able to face. In fact,
this calculation does not take into account the turnings off spikes. So, it is
necessary to take a margin of at least about 50 V.
(V ) max +
D
2
Vac max
N
) Vout
(V D )max is the maximum voltage the high voltage secondary diode must be able
to face. Because of the turning off spikes, a margin must also be taken.
(A L ) and (ni) are the magnetic parameters.
(ni) max + N
n
Vout
Ipk max
(ni) max must not exceed the ferrite (ni). Otherwise, the transformer may get
saturated when the peak current is high.
A +
P
Vout
L
(N
L
n
)2
(A L ) is the ferrite constant that links the primary inductor value to the squared
number of primary turns: Lp = A L x n p2 .
13
14 2.5 V
Voltage
Error Amplifier
A fully compensated Error Amplifier with access to the
inverting input and output is provided. It features a typical
DC voltage gain of 70 dB. The non inverting input is
internally biased at 2.5 V and is not pinned out. The
converter output voltage is typically divided down and
monitored by the inverting input. The maximum input bias
current with the inverting input at 2.5 V is ? 2.0 m A. This can
cause an output voltage error that is equal to the product of
the input bias current and the equivalent input divider source
resistance.
R FB R f Amplifier
C f
Feedback
Input
R 1 R 2
+
Compensation 1.0 mA
Error
2R
R
1.0 V
MC44605
GND
From Power Supply Output
Current
Sense
Comparator
4
Figure 1. Error Amplifier Compensation
http://onsemi.com
8
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相关代理商/技术参数 |
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| MC44608 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller |
| MC44608_06 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Few External Components Reliable and Flexible SMPS Controller |
| MC44608P100 | 功能描述:IC REG CTRLR FLYBK ISO PWM 8-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MC44608P40 | 功能描述:电压模式 PWM 控制器 40KHz High Voltage 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 |
| MC44608P40G | 功能描述:电压模式 PWM 控制器 40KHz High Voltage SMPS PWM 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 |
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