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參數(shù)資料
| 型號： | ML4828 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | BiCMOS Phase Modulation/Soft Switching Controller(BiCMOS 相調(diào)制器/全橋軟開關(guān)控制器) |
| 中文描述： | BiCMOS工藝相位調(diào)制/軟開關(guān)控制器（BiCMOS工藝相調(diào)制器/全橋軟開關(guān)控制器） |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 187K |
| 代理商： | ML4828 |
5
ML4828
FUNCTIONAL DESCRIPTION
PHASE MODULATOR
The ML4828 controls the power of a full bridge power
section by modulating the phases of the switches of the A
and B sides (Figure 1). The power cycle starts with A2 and
B1 high, as shown in the timing diagram (Figure 2).
1. With A2 and B1 high, Q1 and Q2 are ON. Current
flows through the primary of the transformer, and
power is delivered to the output through the secondary
winding (not shown).
2. After either the
Φ
MOD or I
LIM
comparator trips, B1
goes low, turning off Q2. Energy in the primary winding
charges the parasitic capacitances of Q2 and Q3 to
+VIN during t
DB
.
3. B2 goes high after time t
DB
, which is set by the resistor
connected from RB (pin 2) to GND. t
DB
should be set
large enough such that the source of Q3 has been
charged to +VIN. At this time, Q3 turns on at zero
voltage. The transformer is now effectively shorted
through Q1 and Q3, with the primary magnetizing
current circulating in the loop formed by the
transformer primary, Q1, and Q3.
4. CLOCK then goes high and A2 goes low, while A1
remains low for time t
DA
, which is set by the resistor
connected from RA (pin 1) to GND. During this time,
both Q1 and Q4 are OFF. The primary magnetizing
current discharges the parasitic capacitances of Q1 and
Q4 to GND.
5. A1 goes high after time t
DA
. At this point, the drain of
Q4 is discharged to GND, and Q4 turns on at zero
voltage. With both Q3 and Q4 ON, a new power cycle
starts, and power is delivered to the output.
The above sequence is then repeated with the roles of
side A and B interchanged.
The ML4828 can also be used in current mode by sensing
the load current on the RAMP input (pin 11).
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
ML4828
T
B
T
A
Figure 1. Simplified diagram of Phase Modulated power Outputs.
t
DA
t
DA
t
DB
t
DA
t
DB
t
PD1
t
PD1
t
DB
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 |
|---|---|
| ML4828CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:BiCMOS Phase Modulation/Soft Switching Controller |
| ML4828CP UP DIE | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4828CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:BiCMOS Phase Modulation/Soft Switching Controller |
| ML4828IP | 制造商:Rochester Electronics LLC 功能描述: |
| ML4828IP-G | 制造商:Rochester Electronics LLC 功能描述: |
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