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參數(shù)資料
| 型號： | MC44604P |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RV Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 3.3V; Output Voltage (Vdc): 3.3V; Power: 2W; High Isolation 2W Converter; Approved for Medical Applications; EN and UL Safety Certificates; 6kVDC Isolation; Skinny DIP24 Package; Optional Continuous Short Circuit Protected; Fully Encapsulated; Very Low Isolation Capacitance |
| 中文描述： | 0.75 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | PDIP-16 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大?。?/td> | 341K |
| 代理商： | MC44604P |
MC44604
http://onsemi.com
19
That is why, as explained in the transitions §, at each
change of mode, the MC44604 is first turned off so that a
new start–up should be performed.
Figure 40. Start–up Operation
STAND–BY
Ipin 15 > Idet*
YES
NO
Start–up
Vcc gets higher than Vstup–th
– 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 pin 15
to Ireg – refer to stand–by
regulation )
– the soft–start is inhibited
and its capacitor is dis-
charged
– the lpmax limitation block
is activated (clamp of the
peak current)
– the level Vdisable2 is
increased (refer to under-
voltage lockout section)
– The pin 15 is con-
nected to pin 12 to pro-
vide the E/A input with a
feedback
– the stand–by block is
inhibited
NORMAL MODE
* this test is performed
during the first 5 s of
circuit operation
At each start–up, the circuit detects if it must work in
standby or in normal mode configuration.
To do that, the circuit compares the current Ipin15 to Idet
so that, if:
— Ipin15 > Idet: Standby mode
— Ipin15 < Idet: 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
μ
s of
circuit operation in order to have the internal signals well
stabilized before the decision is taken.
Figure 41. Standby Pin 15 Arrangement
C
Vstby
Pin 15
Opto Coupler
TL431
R
VCC
MC44604
Z
Rreg
Rdet
Rinit
T
P
Standby Management
The standby operation consists of two main phases:
— the
off phase
during which the MC44604 is off.
During this sequence, the circuit Vcc 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.
During the active phase, the power conversion is
controlled so that:
— the normal mode regulation means (error amplifier)
and the soft–start are inhibited
— the Vcc undervoltage lockout (Vdisable2) level is
increased from 9 V up to 12.5 V. This limitation of the
Vcc 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 RIpmax connected to the pin 9 so that:
0,4
Ipmax
Iref
2,6
Rlpmax
RS
where: Ipmax is the standby inductor peak current, RS is
the current sense resistor.
— when the pin 15 current gets higher than the threshold
Ireg (20.5
Iref), this operating mode stops and the
circuit output is latched off.
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 Vcc
capacitor is being charged. When the Vcc gets higher
than Vstup–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 Ipin15 gets higher than Ireg
— the
latched phase
: the circuit is on but the output is
disabled. This sequence lasts until the standby Vcc
undervoltage lockout voltage (12.5 V) is reached. A
new off phase is then initialized.
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PDF描述 |
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| MC44605 | High Safety, Latched Mode, GreenLine PWM Controller for (Multi)Synchronized Applications |
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| MC44608P40 | RW-S Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 09V; Power: 2W; DIP24 Low Profile Miniature Package; 1kVDC Isolation; Feedback Regulated Output; 2:1 Wide Range Voltage Input; Continuous Short Circuit Protection; Less than 7mm Height; SMD Pinning Option; Efficiency to 87% |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC44605 | 制造商:ONSEMI 制造商全稱: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:ON Semiconductor 功能描述:High Safety, Latched Mode, GreenLine TM PWM Controller for (Multi) Synchronized Applications |
| MC44605P | 功能描述:電流型 PWM 控制器 Greenline PWM RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC44605PG | 功能描述:電流型 PWM 控制器 ANA SMPS PWM FREQ CONT RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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