参数资料
| 型号： | MC44604PG |
| 厂商： | ON Semiconductor |
| 文件页数： | 19/22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
That is why, as explained in the transitions §, at each
change of mode, the MC44604 is first turned off so that a
new startup should be performed.
V cc gets higher than V stup ? th
Startup
Standby Management
The standby operation consists of two main phases:
? the off phase during which the MC44604 is off.
During this sequence, the circuit V cc is being charged
and no energy is transferred to the output.
? the active phase during which the MC44604 is on. At
this moment, some power can be drawn from the
mains.
YES
I pin 15 > I det *
NO
During the active phase, the power conversion is
controlled so that:
? the normal mode regulation means (error amplifier)
and the soft ? start are inhibited
lpmax
ref
I pmax +
S
STANDBY
? Pin 15 and pin 12 are kept
disconnected and so, the
E/A input receives no feed-
back (the regulation is per-
formed by comparing I pin 15
to I reg ? refer to standby
regulation w )
? the soft ? start is inhibited
and its capacitor is dis-
charged
? the lpmax limitation block
is activated (clamp of the
peak current)
? the level V disable2 is in-
creased (refer to under-
voltage lockout section)
NORMAL MODE
? The pin 15 is connec-
ted to pin 12 to provide
the E/A input with a feed-
back
? the standby block is in-
hibited
* this test is performed
during the first 5 m s of
circuit operation
? the V cc undervoltage lockout (V disable2 ) level is
increased from 9 V up to 12.5 V. This limitation of the
V cc hysteresis enables to increase the pulsed mode
frequency
? the peak inductor current is forced to be constant and
equal to the level programmable by the external
resistor R Ipmax connected to the pin 9 so that:
0, 4 I R
2, 6 R
where: I pmax is the standby inductor peak current, R S is
the current sense resistor.
? when the pin 15 current gets higher than the threshold
I reg (20.5 I ref ), this operating mode stops and the
circuit output is latched off.
Figure 40. Startup Operation
At each startup, the circuit detects if it must work in
standby or in normal mode configuration.
To do that, the circuit compares the current I pin15 to I det
so that, if:
? I pin15 > I det : Standby mode
? I pin15 < I det : Normal mode
According to the detected mode, the circuit configuration
is set (refer to Figure 40).
This detection phase takes place during the first 5 m s of
circuit operation in order to have the internal signals well
stabilized before the decision is taken.
So, in fact, the active phase is split into two distinct
sequences and finally three phases can be defined (refer to
Figure 32):
? the off phase : the MC44604 is off and the V cc
capacitor is being charged. When the V cc gets higher
than V stup ? th , the circuit turns on and the switching
sequence starts
? the switching phase : the circuit is on and forces a
constant peak inductor current. This sequence lasts
until I pin15 gets higher than I reg
? the latched phase : the circuit is on but the output is
disabled. This sequence lasts until the standby V cc
undervoltage lockout voltage (12.5 V) is reached. A
new off phase is then initialized.
Opto Coupler
V stby
V CC
TL431
R reg
Z
R det
R init
C
R
Pin 15
m P
T
MC44604
Figure 41. Standby Pin 15 Arrangement
http://onsemi.com
19
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