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參數資料
| 型號： | MC44608 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Few External Components Reliable Flexible GreenLine Very High Voltage PWM Controller |
| 中文描述： | 很少的外部元件的可靠靈活二七二三六七六七高電壓PWM控制器 |
| 文件頁數： | 5/16頁 |
| 文件大小： | 266K |
| 代理商： | MC44608 |
MC44608
http://onsemi.com
5
PIN FUNCTION DESCRIPTION
Pin
Name
Description
1
Demag
The Demag pin offers 3 different functions: Zero voltage crossing detection (50mV), 24
μ
A current detection
and 120
μ
A current detection. The 24
μ
A level is used to detect the secondary reconfiguration status and the
120
μ
A level to detect an Over Voltage status called Quick OVP.
2
Isense
The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the
power MOSFET. When Isense reaches 1V, the Driver output (pin 5) is disabled. This is known as the Over
Current Protection function. A 200
μ
A current source is flowing out of the pin 3 during the start–up phase and
during the switching phase in case of the Pulsed Mode of operation. A resistor can be inserted between the
sense resistor and the pin 3, thus a programmable peak current detection can be performed during the SMPS
stand–by mode.
3
Control Input
A feedback current from the secondary side of the SMPS via the opto–coupler is injected into this pin. A
resistor can be connected between this pin and GND to allow the programming of the Burst duty cycle during
the Stand–by mode.
4
Ground
This pin is the ground of the primary side of the SMPS.
5
Driver
The current and slew rate capability of this pin are suited to drive Power MOSFETs.
6
VCC
This pin is the positive supply of the IC. The driver output gets disabled when the voltage becomes higher
than 15V and the operating range is between 6.6V and 13V. An intermediate voltage level of 10V creates a
disabling condition called Latched Off phase.
7
This pin is to provide isolation between the Vi pin 8 and the VCC pin 6.
This pin can be directly connected to a 500V voltage source for start–up function of the IC. During the
Start–up phase a 9 mA current source is internally delivered to the VCC pin 6 allowing a rapid charge of the
VCC capacitor. As soon as the IC starts–up, this current source is disabled.
8
Vi
OPERATING DESCRIPTION
Regulation
Figure 1. Regulator
S3
1
0
&
3
Regulation
Output
20
S2
1
0
Control
Input
VCC
VLP–stby
5 V
4 kHz
Filter
Vdd
PWM
Comparator
Switching Phase
Stand–by
Latched off Phase
1.6 V
The pin 3 senses the feedback current provided by the opto
coupler. During the switching phase the switch S2 is closed
and the shunt regulator is accessible by the pin 3. The shunt
regulator voltage is typically 5V. The dynamic resistance of
the shunt regulator represented by the zener diode is 20 .
The gain of the Control input is given on Figure 10 which
shows the duty cycle as a function of the current injected into
the pin 3.
A 4kHz filter network is inserted between the shunt
regulator and the PWM comparator to cancel the high
frequency residual noise.
The switch S3 is closed in Stand–by mode during the
Latched Off Phase while the switch S2 remains open. (See
section PULSED MODE DUTY CYCLE CONTROL).
The resistor Rdpulsed (Rduty cycle burst) has no effect on
the regulation process. This resistor is used to determine the
burst duty cycle described in the chapter “Pulsed Duty Cycle
Control” on page 8.
PWM Latch
The MC44608 works in voltage mode. The on–time is
controlled by the PWM comparator that compares the
oscillator sawtooth with the regulation block output (refer to
the block diagram on page 2).
The PWM latch is initialized by the oscillator and is reset
by the PWM comparator or by the current sense comparator
in case of an over current. This configuration ensures that
only a single pulse appears at the circuit output during an
oscillator cycle.
Current Sense
The inductor current is converted to a positive voltage by
inserting a ground reference sense resistor RSense in series
with the power switch.
The maximum current sense threshold is fixed at 1V. The
peak current is given by the following equation:
Ipkmax
Rse1
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相關代理商/技術參數 |
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| MC44608_06 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Few External Components Reliable and Flexible SMPS Controller |
| MC44608P100 | 功能描述:IC REG CTRLR FLYBK ISO PWM 8-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| MC44608P40 | 功能描述:電壓模式 PWM 控制器 40KHz High Voltage RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MC44608P40G | 功能描述:電壓模式 PWM 控制器 40KHz High Voltage SMPS PWM RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| MC44608P75 | 功能描述:電壓模式 PWM 控制器 75KHz High Voltage RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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