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參數資料
| 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： | 18/24頁 |
| 文件大小： | 405K |
| 代理商： | MC44603A |
MC44603A
18
MOTOROLA ANALOG IC DEVICE DATA
Undervoltage Lockout Section
Figure 47. VCC Management
Reference Block:
Voltage and Current
Sources Generator
(Vref, Iref, ...)
VCC
Vref enable
Cstartup
1
0
1
0
Vdisable2
7.5 V
Startup
14.5 V
UVLO1
(to Soft–Start)
Vdisable1
9.0 V
CUVLO1
RF Stby
Rref
Pin 15
Pin 16
1
As depicted in Figure 47, an undervoltage lockout has
been incorporated to garantee that the IC is fully functional
before allowing system operation.
This block particularly, produces Vref (Pin 16 voltage) and
Iref that is determined by the resistor Rref connected between
Pin 16 and the ground:
Vref
Rref
Another resistor is connected to the Reference Block:
RF Stby that is used to fix the standby frequency.
In addition to this, VCC is compared to a second threshold
level that is nearly equal to 9.0 V (Vdisable1). UVLO1 is
generated to reset the maximum duty cycle and soft–start
block disabling the output stage as soon as VCC becomes
lower than Vdisable1. In this way, the circuit is reset and made
ready for the next startup, before the reference block is
disabled (refer to Figure 29). Finally, the upper limit for the
minimum normal operating voltage is 9.4 V (maximum value
of Vdisable1) and so the minimum hysteresis is 4.2 V.
((Vstup–th) min = 13.6 V).
The large hysteresis and the low startup current of the
MC44603A make it ideally suited for off–line converter
applications where efficient bootstrap startup techniques are
required.
Iref
where Vref
2.5 V (typically)
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相關代理商/技術參數 |
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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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格: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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