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參數(shù)資料
| 型號(hào)： | ML4818CP |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Phase Modulation/Soft Switching Controller |
| 中文描述： | 1.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP24 |
| 封裝： | POWER, PLASTIC, DIP-24 |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 92K |
| 代理商： | ML4818CP |
PRODUCT SPECIFICATION
ML4818
REV. 1.0.3 6/21/01
6
Functional Description
Phase Modulator
Power is controlled by modulating the switching phase on
sides A and B of the full H-bridge converter (Figure 1).
Power is delivered to the output through the transformer sec-
ondary. The power conversion process is described by the
following sequence and illustrated by the timing diagram of
Figure 2:
1.
A2 and B1 are high (Q1 and Q2 are on), beginning the
power conversion cycle.
2.
After the
Φ
MOD comparator trips, B1 goes low turning
off Q2. The parasitic drain-to-source capacitances of Q2
and Q4 charge to +VIN. This forces the drain-to-source
voltage across Q3 to 0V.
3.
B2 now goes high after t
DELAY
(set by R
DELAY
). Since the
voltage across Q3 is now 0V, B2 turns Q3 on at zero
voltage.
4.
The CLOCK now goes high turning A2 off. During this
period, Q1 and Q2 and Q4 are off. The transformer leak-
age current discharges the drain-to-source capacitance
on Q4 until there is 0V across it.
5.
A1 will remain low for a period defined by t
DELAY
, then it
goes high. The voltage across Q4 is now 0V as A1 turns
it on at zero voltage.
6.
The previous sequence is now repeated with the oppo-
site polarity on all outputs (see Figure 2).
The above sequence is then repeated but with the opposite
polarity on all outputs.
Figure 1. Simplified diagram of Phase Modulated power Outputs
Figure 2. Phase Modulation control waveforms (Shaded areas indicate a power cycle)
B2
B1
A2
A1
I
LIM
R
SENSE
T
B
Q3
Q2
Q4
Q1
T
A
TRANSFORMER
L
LEAKAGE
B
A
+VIN
ML4818
t
DELAY
t
DELAY
t
DELAY
t
DELAY
t
DELAY
t
PD1
t
PD1
t
DELAY
t
PD1
C
T
CLOCK
A2
A1
B1
B2
B
A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4818CP | 制造商:Fairchild Semiconductor Corporation 功能描述:CONTROLLER IC ROHS COMPLIANT:NO |
| ML4818CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Phase Modulation/Soft Switching Controller |
| ML4819 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor and PWM Controller Combo |
| ML4819CP | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 PFC Controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML4819CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Power Factor and PWM Controller Combo |
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