參數(shù)資料
型號(hào)： MC44604
廠商： ON SEMICONDUCTOR
英文描述： High Safety Pulsed Mode Stanby GreenLine PWM Controller
中文描述： 高安全性脈沖模式Stanby二七二三六七六七PWM控制器
文件頁(yè)數(shù)： 20/24頁(yè)
文件大?。?/td> 341K
代理商： MC44604
MC44604
http://onsemi.com
20
until the next re–start
Figure 42. Standby Regulation
time
V
Izener
Ipin 15
output
Vpin 15
CC
Vstby
P supply
voltage
Ireg
Idet
Stby Vdisable 2(12.5 V)
Vstup (14.5 V)
As a consequence, Vstby 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 Ireg 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 Rreg, is drawn by this device, when the
μ
P supply
voltage gets higher than Vz. By this way, the current injected
in the pin 15 increases and when this current is detected as
higher than Ireg, the output gets disabled until the next
start–up (Note 1).
Practically, the pin 15 current can be expressed as follows
(when the zener is activated):
Vstby
Ipin15
CTR
Vopto
Rreg
Vz
where: CTR is the opto coupler gain, Vopto is opto coupler
voltage drop.
So, as the Vstby peak value is obtained when (Ipin15 =
Ireg), it can be calculated using the following equation:
Vstby pk
Vz
Vopto
Rreg
Ireg
CTR
Practically, Rreg is chosen very low (in the range of 10
,
low resistance just to limit the current when Vstby pk gets
higher than Vz):
Vstby pk
Vz
Vopto
Note 1. If the pin 15 current is higher than Ireg at start–up, the
output is just shutdown but not latched. The circuit must
detect a sequence during which Ipin15 lower than Ireg
before being able to latch gets higher than Vz).
Transitions Between Normal Mode and Standby Mode
(Refer to Figure 43)
The MC44604 detects a transition by comparing the pin
15 current to:
— Idet (transition standby to normal mode)
— Iinit (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.
transition normal mode to standby:
This transition is detected by comparing the Ipin15 current
to the threshold current (Iinit).
Iinit 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
μ
P initializes the standby mode by turning
on the switch T. This results in the C capacitor charge that
produces a peak current in the primary side of the opto
coupler. C and Rinit must be dimensioned so that the opto
coupler primary side generates a pin 15 current higher than
Iinit during more than 1
μ
s.
transition standby to normal mode:
If the circuit detects that (Ipin15 < Idet) during standby
operation, the circuit is turned off. So, if the normal mode is
maintained at the following start–up, the circuit will re–start
in a normal mode configuration.
The arrangement in Figure 41 allows to perform this
detection. When the
μ
P detects the end of the standby, it
turns off the switch T and the opto coupler stops supplying
current to the circuit.
Figure 43. Transitions Between Modes
Stand–by Burst Mode
Normal
Mode
14.5 V
12.5 V
The transition stand–by to normal mode occurs while
the circuit is on (working phase)
The transition stand–by to normal mode occurs while
the circuit is off (VCC charge phase)
Stand–by Burst Mode
Normal
Mode
Stand–by
time
(....
(....
Normal
Mode
14.5 V
12.5 V
Normal
Mode
time
Normal
Mode
Stand–by
Normal
Mode
VCC
VCC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MC44604_05 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:High Safety Pulsed Mode Standby GreenLine TM PWM Controller
MC44604P 功能描述:電流型 PWM 控制器 Voltage Mode PWM RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MC44604PG 功能描述:電流型 PWM 控制器 Voltage Mode PWM w/Bust Mode Standby RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MC44605 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:High Safety, Latched Mode, GreenLine PWM Controller for (Multi)Synchronized Applications
MC44605_06 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:High Safety, Latched Mode, GreenLine TM PWM Controller for (Multi) Synchronized Applications
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