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ML4818CP Scheda tecnica(PDF) 1 Page - Fairchild Semiconductor

Il numero della parte ML4818CP
Spiegazioni elettronici  Phase Modulation/Soft Switching Controller
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ML4818CP Scheda tecnica(HTML) 1 Page - Fairchild Semiconductor

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REV. 1.0.3 6/21/01
Features
• Full bridge phase modulation zero voltage switching
circuit with programmable ZV transition times
• Constant frequency operation to 500kHz
• Current mode operation
• Cycle-by-cycle current limiting with integrating fault
detection and restart delay
• Precision buffered 5V reference (+1%)
• Four 1.5A peak current totem-pole output drivers
• Under-voltage lockout circuit with 6V hysteresis
• Power DIP package
General Description
The ML4818 is a complete phase modulation control IC suit-
able for full bridge soft switching converters. Unlike conven-
tional PWM circuits, the phase modulation technique allows
for zero-voltage switching transitions and square wave drive
across the transformer. The IC modulates the phases of the
two sides of the bridge to control output power.
The ML4818 can be operated in current mode. The delay
times for the outputs are externally programmable to allow
the zero-voltage switching transitions to take place.
Pulse-by-pulse current limit, integrating fault detection, and
soft start reset are provided. The under-voltage lockout cir-
cuit features a 6V hysteresis with a low starting current to
allow off-line start up with a low power bleed resistor. A
shutdown function powers down the IC, putting it into a low
quiescent state.
Block Diagram
10
13
11
2
3
5
8
9
12
4
24
20
16
17
22
21
14
*
ILIM
RCRESET
SOFT START
INV
E/A OUT
CT
RAMP
RT
CLOCK
SHUTDOWN
VREF
VCC
A2 OUT
A1 OUT
B1 OUT
B2 OUT
RDELAY
GND
REFERENCE
AND
UNDER-VOLTAGE
LOCKOUT
+
T FLIP
FLOP
T
Q
Q
SQ
R
OSC
Q
+
ΦMOD
+
ERROR
AMP
V+
I1
+5V
3V
Q
R
S
+
1V
DELAY
VCC
DELAY
VCC
DELAY
VCC
DELAY
INHIBIT
OUTPUTS
*PINS 1, 6, 7, 15, 18, 19 AND 23 ARE GND
0.7V
I2
+
R
S
ML4818
Phase Modulation/Soft Switching Controller


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