参数资料
| 型号： | MC44604PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 16/22页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBACK PWM 16-DIP |
| 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： | 82% |
| 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： | 无 |
| 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： | MC44604PGOS |
MC44604
V ref
Output
Control
V Pin 8
Zero Current
Detection
0.75 V
Pin 11
D Z
2.4 V
0.4 I ref
D max
Output
Buffer
On ? Time
Off ? Time Dead ? Tim e
65 mV
? 0.33 V
Soft ? Start
Capacitor
V OSC
Oscillator
MC44604
Figure 33. D max and Soft ? Start Block Diagram
Figure 31. Demagnetization Detection
Maximum Duty Cycle and Soft ? Start Control
A diode D has been incorporated to clamp the positive
applied voltages while an active clamping system limits the
negative voltages to typically ? 0.33 V. This negative clamp
level is sufficient to avoid the substrate diode switching on.
In addition to the comparator, a latch system has been
incorporated in order to keep the demagnetization block
output level low as soon as a voltage lower than 65 mV is
detected and as long as a new restart is produced (high level
on the output) (refer to Figure 33). This process avoids that
As explained in the paragraph “oscillator”, the duty cycle
cannot be more than 80%. Now, using the D max and
soft ? start control, this duty cycle can be limited to a lower
value. Indeed as depicted in Figure 34, the pin 11 voltage is
compared to the oscillator sawtooth, so that the MC44604
output should be disabled as soon as the pin 11 level
becomes lower than the oscillator voltage (refer to Figure 27
and to Figure 25).
any ringing on the signal used on the pin 8, disrupts the
demagnetization detection. Finally, this method results in a
very accurate demagnetization detection.
For a higher safety, the demagnetization block output is
also directly connected to the output, disabling it during the
demagnetization phase (refer to Figure 29).
Voltage
D max
Figure 34. Maximum Duty Cycle Control
Pin 11
V CT
(Pin 10)
Oscillator
Buffer
Output
R Q
Demag
S
V CC
Now, using the internal current source (0,4 I ref ), the pin 11
voltage can easily be fixed by connecting a resistor to this
pin.
If a capacitor is connected to pin 11 (without any resistor
or in parallel to a resistor for instance), the pin 11 voltage
V demag out
Negative Active
Clamping System
increases from 0 to its maximum value progressively (refer
to Figure 26).
Thus, the allowed maximum duty cycle grows for a delay
C DEM
65 mV
D
Pin 8
depending on the capacitor value (and the resistor value
when a resistor is connected).
So, this pin can be used to limit the duty cycle during the
startup phase and thus, to perform a soft ? start.
Figure 32. Demagnetization Block
http://onsemi.com
16
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