参数资料
| 型号： | MC44605PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/20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
dson
ref
OHD
R 2
(p on) max
OHD
S
E.H.T. OVP
Consequently, by replacing V OHD by 2.5 V (threshold
value) in the last equation, the value R OHD to use, can be
deducted:
2.5 R R
R +
3 Γ
where: (p on ) max are the maximum on time losses that are
acceptable.
Pin 12
V re f
1 0
3.4% I ref
Dis OHD
Dis MPL
V ref
1
104% I ref
0
Q S V WSCD
R
Disabling Block Section
V CC
Delay
4 m S
This section consists of a “definitive inhibition latch”
(directly supplied by the V cc ) that disables the output (the
output is forced to zero).
In effect, this block aims at definitively disabling the
circuit when one of the following faults is detected:
— a Winding Short Circuit
— too high synchronization pulses
— a too high input power
— a too high power switch (MOSFET) heating
2.5 V
Definitive
Inhibition
Latch
Output
Buffer
MC44605
The signals corresponding to these faults are high when a
fault is detected (for instance, when the input power is
detected as too high, Dis MPL is high).
When one (or several) of these four faults is detected, a
current source charges C ext (with a certain duty cycle) and
when its voltage becomes higher than V ref , the definitive
inhibition latch is activated. Thus, the circuit gets
definitively disabled after a delay depending on C ext .
According to the detected fault, the current that charges
C ext is not the same:
The typical values are:
— 260 m A for EHTOVP and WSCD
— 8.5 m A for OHD and MPL
Figure 15. Disabling Block
This latch is reset when the V cc falls down to about 3.0 V.
In this case, if a new startup is performed, the circuit will
work normally (until this fault or another one is detected).
Practically, to re ? start after a fault has shutdown the
circuit, the converter must be turned off for a time long
enough to enable the V cc capacitor discharge (repair time...).
Note: As V WSCD is generally a really narrow pulse, it is
necessary to add a latch and a delay to build a 4 m s width
pulse when V WSCD becomes high.
when R ref is equal to 10 k W .
http://onsemi.com
17
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| 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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