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參數(shù)資料
| 型號： | MC44603A |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | DC/DC變換器 |
| 英文描述： | RV Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 3.3V; Output Voltage (Vdc): 15V; 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： | 混合頻率模式二七二三六七六七的PWM控制器 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 405K |
| 代理商： | MC44603A |
MC44603A
10
MOTOROLA ANALOG IC DEVICE DATA
–50
–25
0
25
50
75
100
TA, AMBIENT TEMPERATURE (
°
C)
Figure 25. Standby Reference Current
versus Temperature
Figure 26. Current Sense Voltage Threshold
Standby Mode versus Temperature
–50
–25
0
25
50
75
100
TA, AMBIENT TEMPERATURE (
°
C)
270
260
250
240
230
0.33
0.32
0.31
0.30
μ
R
I
A
V
265
255
245
235
S
VR P Stdby (Pin 12)
Voltage Increasing
VCC = 12 V
Rref = 10 k
CT = 820 pF
Pin 12 Clamped
at 1.0 V
PIN FUNCTION DESCRIPTION
Pin
Name
Description
1
VCC
VC
This pin is the positive supply of the IC. The operating voltage range after startup is 9.0 to 14.5 V.
2
The output high state (VOH) is set by the voltage applied to this pin. With a separate connection to the
power source, it can reduce the effects of switching noise on the control circuitry.
3
Output
Peak currents up to 750 mA can be sourced or sunk, suitable for driving either MOSFET or Bipolar
transistors. This output pin must be shunted by a Schottky diode, 1N5819 or equivalent.
4
Gnd
The ground pin is a single return, typically connected back to the power source; it is used as control and
power ground.
5
Foldback Input
The foldback function provides overload protection. Feeding the foldback input with a portion of the VCC
voltage (1.0 V max) establishes on the system control loop a foldback characteristic allowing a smoother
startup and sharper overload protection. Above 1.0 V the foldback input is inactive.
6
Overvoltage
Protection
When the overvoltage protection pin receives a voltage greater than 17 V, the device is disabled and
requires a complete restart sequence. The overvoltage level is programmable.
7
Current Sense
Input
A voltage proportional to the current flowing into the power switch is connected to this input. The PWM
latch uses this information to terminate the conduction of the output buffer when working in a current
mode of operation. A maximum level of 1.0 V allows either current or voltage mode operation.
8
Demagnetization
Detection
A voltage delivered by an auxiliary transformer winding provides to the demagnetization pin an indication
of the magnetization state of the flyback transformer. A zero voltage detection corresponds to complete
core saturation. The demagnetization detection ensures a discontinuous mode of operation. This
function can be inhibited by connecting Pin 8 to Gnd.
9
Synchronization
Input
The synchronization input pin can be activated with either a negative pulse going from a level between
0.7 V and 3.7 V to Gnd or a positive pulse going from a level between 0.7 V and 3.7 V up to a level
higher than 3.7 V. The oscillator runs free when Pin 9 is connected to Gnd.
10
CT
The normal mode oscillator frequency is programmed by the capacitor CT choice together with the Rref
resistance value. CT, connected between Pin 10 and Gnd, generates the oscillator sawtooth.
11
Soft–Start/Dmax/
Voltage–Mode
A capacitor, resistor or a voltage source connected to this pin limits the switching duty–cycle. This pin
can be used as a voltage mode control input. By connecting Pin 11 to Ground, the MC44603A can be
shut down.
12
RP Standby
A voltage level applied to the RP Standby pin determines the output power level at which the oscillator will
turn into the reduced frequency mode of operation (i.e. standby mode). An internal hysteresis
comparator allows to return in the normal mode at a higher output power level.
13
E/A Out
The error amplifier output is made available for loop compensation.
14
Voltage Feedback
This is the inverting input of the Error Amplifier. It can be connected to the switching power supply output
through an optical (or other) feedback loop.
15
RF Standby
Rref
The reduced frequency or standby frequency programming is made by the RF Standby resistance choice.
Rref sets the internal reference current. The internal reference current ranges from 100
μ
A to 500
μ
A.
This requires that 5.0 k
≤
Rref
≤
25 k
.
16
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相關(guān)代理商/技術(shù)參數(shù) |
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| MC44603A_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Enhanced Mixed Frequency Mode GreenLine TM PWM Controller:Fixed Frequency, Variable Frequency,Standby Mode |
| MC44603ADW | 功能描述:電流型 PWM 控制器 Voltage/Current PWM RoHS:否 制造商:Texas Instruments 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC44603ADWG | 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(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC44603ADWR2 | 功能描述:電流型 PWM 控制器 Voltage/Current PWM RoHS:否 制造商:Texas Instruments 開關(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MC44603ADWR2G | 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(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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