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ML4810CP Datasheet(PDF) 1 Page - Micro Linear Corporation

No. de pieza ML4810CP
Descripción Electrónicos  High Frequency Power Supply Controller
Download  12 Pages
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Fabricante Electrónico  MICRO-LINEAR [Micro Linear Corporation]
Página de inicio  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4810CP Datasheet(HTML) 1 Page - Micro Linear Corporation

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1
BLOCK DIAGRAM (Pin numbers shown are for ML4811)
May 1997
ML4810
*, ML4811**
High Frequency Power Supply Controller
FEATURES
s
Integrating Soft Start Reset
s
High current (2A peak) dual totem pole outputs
s
Practical operation to 1MHz (fOSC)
s
5.1V
±2% trimmed bandgap reference
s
Under voltage lockout with 7V hysteresis
s
Soft Start Reset Delay (ML4811)
s
Oscillator synchronization function (ML4811)
s
Soft Start latch ensures full soft start cycle
s
Outputs pull low for undervoltage lockout
s
Accurately controlled oscillator ramp discharge current
s
All timing currents “slaved” to RT for precise control
GENERAL DESCRIPTION
The ML4810 and ML4811 High Frequency PWM
Controllers are optimized for use in Switch Mode Power
Supply designs running at frequencies to 1MHz. The
ML4810/11 contain a unique overload protection circuit
which helps to limit stress on the output devices and
reliably performs a soft-start reset. These controllers are
designed to work in either voltage or current mode and
provide for input voltage feed forward.
A 1.1V threshold current limit comparator provides a
cycle-by-cycle current limit. An integrating circuit
“counts” the number of times the 1.1V limit was reached.
A soft-start cycle is initiated if the cycle-by-cycle current
limit is repeatedly activated. A reset delay function is
provided on the ML4811.
These controllers are similar to the UC1825 controller,
* This part is End of Life as of August 1, 2000
however these controllers include many features not
** This part is Obsolete
found on the 1825. These features are set in
Italics.
+
RT
OUT A
E/A OUT
ILIM/SD
RC (RESET)
RESET DELAY
INV
SOFT START
1.5V
CLOCK
1.1V
1.1V
5.1V
2.45V
1.1V
I(1)
3
× I(1)
V+
R
POWER VC
POWER GND
P
4V
R
TF.F.
OSC
S
UNDER
VOLTAGE
LOCKOUT
INTERNAL
BIAS
Q
ENABLE
VREF
VREF GEN
9V
Q
Q
C
Q
S
RAMP
CT
CLOCK
PWR VC
OUT B
POWER GND
VCC
GND
NI
6
7
SYNC
10
O.V.P./SHUTDOWN
11
8
3
2
1
12
9
R
Q
S
+
+
+
+
4
20
+
+
2.2V
1.5V VREF
COMP
ERROR
AMP
1.25V
I(1)
V+
I(1) =
3V
16 x RT
5
16
14
17
13
18
15
19


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