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Micro Linear
Micro Linear

ML4811 Datasheet Preview

ML4811 Datasheet

High Frequency Power Supply Controller

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ML4811 pdf
May 1997
ML4810*, ML4811**
High Frequency Power Supply Controller
GENERAL DESCRIPTION
FEATURES
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,
however these controllers include many features not
found on the 1825. These features are set in Italics.
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
* This part is End of Life as of August 1, 2000
** This part is Obsolete
BLOCK DIAGRAM (Pin numbers shown are for ML4811)
6 RT
7 CT
OSC
SYNC
10
O.V.P./SHUTDOWN
11
RAMP
8
1.25V
E/A OUT
3
2 NI
ERROR
+ AMP
1 INV
9 SOFT START
2.2V
+
COMP
+
I(1)
V+
I(1) C Q
TF.F.
PQ
1.1V
ILIM/SD
12
1.5V
+
+
2.45V
RC (RESET)
4
+
3× I(1)
S
Q
R
RESET DELAY
20
CLOCK
1.1V
+
V+
SQ
R
5.1V
1.1V
CLOCK
5
R
SQ
POWER GND
PWR VC 16
OUT A 14
POWER VC
OUT B 17
POWER GND
15
+ 4V
ENABLE
VREF
VREF GEN
1.5V VREF 19
9V
UNDER +
VOLTAGE
LOCKOUT
INTERNAL
BIAS
I(1)
=
3V
16 x RT
VCC 18
GND
13
1



Micro Linear
Micro Linear

ML4811 Datasheet Preview

ML4811 Datasheet

High Frequency Power Supply Controller

No Preview Available !

ML4811 pdf
ML4810, ML4811
PIN CONFIGURATION
ML4810
16-Pin DIP (P16)
16-Pin SOIC (S16W)
INV
NI
E/A OUT
RCRESET
RT
CT
RAMP
SOFT START
1 16
2 15
3 14
4 13
5 12
6 11
7 10
89
TOP VIEW
5.1V REF
VCC
OUTB
POWER VC
PWR GND
OUTA
GND
ILIM/S.D.
ML4811
20-Pin DIP (P20)
20-Pin SOIC (S20)
INV
NI
E/A OUT
RCRESET
CLOCK
RT
CT
RAMP
SOFT START
SYNC
1 20
2 19
3 18
4 17
5 16
6 15
7 14
8 13
9 12
10 11
TOP VIEW
RESET DELAY
5.1V REF
VCC
OUTB
POWER VC
PWR GND
OUTA
GND
ILIM/S.D.
OVP
PIN DESCRIPTION
PIN NAME
1 INV
FUNCTION
Inverting input to error amp.
2 NI
Non-inverting input to error amp.
3 E/A OUT
Output of error amplifier and input to
main comparator.
4 RCRESET
Timing elements for Integrating Soft
Start reset.
5 CLOCK
Oscillator output.
6 RT
Timing resistor for oscillator — sets
charging current for oscillator timing
capacitor (pin 6).
7 CT
8 RAMP
Timing capacitor for oscillator.
Non-inverting input to main
comparator. Connected to CT for
voltage mode operation or to current
sense resistor for current mode.
9 SOFT START Normally connected to Soft Start
capacitor.
10 SYNC
A high going pulse terminates the
PWM cycle and discharges CT.
PIN NAME
11 OVP
FUNCTION
Exceeding 2.5V terminates the PWM
cycle and inhibits the outputs.
12 ILIM/S.D.
Current limit sense pin. Normally
connected to current sense resistor.
13 GND
Analog signal ground.
14 OUTA
High current totem pole output. This
output is the first one energized after
power on reset.
15 PWR GND Return for the high current totem
pole outputs.
16 VC
Positive supply for the high current
totem pole outputs.
17 OUTB
High current totem pole output.
18 VCC
19 5.1V REF
Positive supply for the IC.
Buffered output for the 5.1V voltage
reference.
20 RESET DELAY Timing capacitor to determine the
amount of delay between fault.
2


Part Number ML4811
Description High Frequency Power Supply Controller
Maker Micro Linear
Total Page 12 Pages
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