参数资料
| 型号： | MC44604PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 20/22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 CC
V stby
m P supply
voltage
V pin 15
I zener
V stup (14.5 V)
Stby Vdisable 2 (12.5 V)
detect a sequence during which I pin15 lower than I reg
before being able to latch gets higher than V z ).
Transitions Between Normal Mode and Standby Mode
(Refer to Figure 43)
The MC44604 detects a transition by comparing the pin
15 current to:
? I det (transition standby to normal mode)
? I init (transition normal mode to standby)
Each transition detection results in the circuit turning off,
so that the device can work in the new mode after the
following restart.
I pin 15
I reg
I det
output
The output is latched off
until the next re ? start
Figure 42. Standby Regulation
time
? transition normal mode to standby:
This transition is detected by comparing the I pin15 current
to the threshold current (I init ).
I init is high enough so that the opto coupler current used
for the regulation, never exceeds this value.
The arrangement in Figure 41 is well adapted to this mode
of operation. The m P initializes the standby mode by turning
on the switch T. This results in the C capacitor charge that
As a consequence, V stby varies between a peak value
(obtained at the end of the switching phase) and a valley
level (reached at the end of the off phase).
The level of the peak value is controlled by forcing a
current higher than I reg in pin 15 when this level has reached
the desired value.
The arrangement in Figure 41 allows to obtain this
operation. A zener diode Z is connected so that a current
limited by R reg , is drawn by this device, when the m P supply
voltage gets higher than V z . By this way, the current injected
in the pin 15 increases and when this current is detected as
higher than I reg , the output gets disabled until the next
startup (Note 1).
produces a peak current in the primary side of the opto
coupler. C and R init must be dimensioned so that the opto
coupler primary side generates a pin 15 current higher than
I init during more than 1 m s.
? transition standby to normal mode:
If the circuit detects that (I pin15 < I det ) during standby
operation, the circuit is turned off. So, if the normal mode is
maintained at the following startup, the circuit will restart in
a normal mode configuration.
The arrangement in Figure 41 allows to perform this
detection. When the m P detects the end of the standby, it
turns off the switch T and the opto coupler stops supplying
current to the circuit.
* Vopto * V z
stby
pin15
R reg
14.5 V
Practically, the pin 15 current can be expressed as follows
(when the zener is activated):
V
I + CTR
where: CTR is the opto coupler gain, V opto is opto coupler
voltage drop.
So, as the Vstby peak value is obtained when (I pin15 =
I reg ), it can be calculated using the following equation:
V CC
( .... )
12.5 V
Normal Normal
Mode Standby Burst Mode Mode
Standby Normal
Mode time
The transition stand ? by to normal mode occurs while
the circuit is off (V CC charge phase)
R reg I reg
+ V z ) Vopto )
stby pk
CTR
V
Practically, R reg is chosen very low (in the range of 10 W ,
low resistance just to limit the current when V stby pk gets
higher than V z ):
V CC
14.5 V
12.5 V
Normal
Mode
Standby
( .... )
Standby Burst Mode
Normal
Mode
Normal
Mode
time
stby pk
V
^ V z ) Vopto
The transition stand ? by to normal mode occurs while
Note 1. If the pin 15 current is higher than I reg at startup, the
output is just shutdown but not latched. The circuit must
http://onsemi.com
20
the circuit is on (working phase)
Figure 43. Transitions Between Modes
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