参数资料
| 型号： | MC44605PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/20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
Finally, when there is a winding short circuit, an
(V CS + V shift )/R S
V CS /R S
(Vin x d t/L leak
Vin x d t/L p
overcurrent is detected by the WSCD comparator. The
output of this comparator, V WSCD , is connected to the
disabling block (refer to the disabling block §).
Maximum Power Limitation Section (MPL)
The MPL block is designed to calculate this input power
using the following equation:
Pin + 1
2
L
P
Ipk 2
f
d t
d t
time
where: Lp is the inductor value
Ipk is the inductor peak current
f is the switching frequency
D Ipk + Vin
P
+ Vin
( D Ipk)
Leak
Vcs 2
V
+ R
k
(Sf) + k1 R C
Figure 12. Overcurrent in a WSCD Case
Now, in normal working, this overcurrent D Ipk is equal to:
δ t
L
where: V in is the input voltage (rectified a.c. line)
While in a WSCD case:
δ t
WSCD L
Consequently, as the leakage inductor value is generally
much lower than the primary one (less than 5% generally),
the overcurrent is much higher in the WSCD case. That is
why this fault can be detected by detecting the high
overcurrents.
So, the WSCD block consists of comparing the sensed
current to a reference equal to: (V cs + V shift ), where V shift is
a voltage proportional to the current injected in the pin 15
(refer to Figure 13).
Vin
As V cs is proportional to the inductor peak current
(V cs = R s x Ipk), the squared Ipk value is estimated by
building a current source proportional to V cs2 . This current
is chopped by a calibrated pulse Sf, generated at each new
oscillator cycle (refer to Figure 14).
Finally, using an external resistor and capacitor network
(R MPL , C MPL ) on the MPL pin, a voltage V MPL ,
proportional to the input power can be obtained.
In effect,
(Sf)
MPL MPL MPL T
where: k MPL is the multiplier gain
(Sf) is the width of the calibrated pulse
T is the switching (oscillator) period
Now, as Sf is built comparing the oscillator to a constant
level, (Sf) is proportional to R ref and C T :
ref T
where: k1 is a constant
On the other hand, k MPL that is depending on the reference
current source I ref , is proportional to 1/R ref :
MPL
ref
Pin 7
I sense
C WSCD
V WSCD
Disabling
Block
Pin 15
R
k
where: k2 is a constant
+ k2
1
R
3.75 W
So:
MPL
MPL
V shift
V shift shift = 500 W
I shift
V + R k1 k2
where: C T is the oscillator capacitor
Vcs 2
f
C
T
V + R Γ Vcs 2 f C
Pin + 1 L Ipk 2 f
Vcs
MC44605
Figure 13. WSCD
Now, as the overcurrent level depends on the input voltage
V in , it is preferable to use a V shift proportional to this input
voltage instead of a constant V shift . So, the WSCD pin must
be connected to V in through a resistor that fixes V shift by
adjusting the current injected in this pin 15.
Finally:
MPL MPL MPL T
where: Γ MPL is the MPL parameter as defined in the
specification. This is a constant equal to the product
(k1 x k2).
Now, as:
2 P
http://onsemi.com
15
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| 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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