ML4810CP Micro Linear, ML4810CP Datasheet

no-image

ML4810CP

Manufacturer Part Number
ML4810CP
Description
High frequency power supply controller
Manufacturer
Micro Linear
Datasheet

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ML4810CP
Manufacturer:
ML
Quantity:
5 510
Part Number:
ML4810CP
Manufacturer:
MAXIM
Quantity:
5 510
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,
however these controllers include many features not
found on the 1825. These features are set in Italics.
BLOCK DIAGRAM
10
11
12
20
6
7
8
3
2
1
9
4
E/A OUT
NI
INV
SOFT START
I
RC (RESET)
RESET DELAY
R
C
SYNC
O.V.P./SHUTDOWN
RAMP
LIM
T
T
2.45V
/SD
1.5V
1.1V
+
+
+
+
ERROR
3 I(1)
AMP
1.25V
CLOCK
OSC
Q
(Pin numbers shown are for ML4811)
S
R
High Frequency Power Supply Controller
1.1V
+
I(1)
+
COMP
V+
2.2V
S
R
+
P
C
+
Q
TF.F.
1.1V
Q
Q
I(1)
FEATURES
Integrating Soft Start Reset
High current (2A peak) dual totem pole outputs
Practical operation to 1MHz (f
5.1V 2% trimmed bandgap reference
Under voltage lockout with 7V hysteresis
Soft Start Reset Delay (ML4811)
Oscillator synchronization function (ML4811)
Soft Start latch ensures full soft start cycle
Outputs pull low for undervoltage lockout
Accurately controlled oscillator ramp discharge current
All timing currents “slaved” to R
5.1V
** This part is Obsolete
* This part is End of Life as of August 1, 2000
V+
LOCKOUT
VOLTAGE
UNDER
ML4810*,
R
S
+
9V
Q
OSC
V
ENABLE
POWER GND
POWER V
REF
I(1) =
T
V
REF
for precise control
INTERNAL
)
GEN
BIAS
16 x R
3V
C
ML4811**
+
T
POWER GND
4V
May 1997
1.5V V
PWR V
CLOCK
OUT A
OUT B
GND
V
REF
CC
C
17
16
14
15
19
18
13
1
5

Related parts for ML4810CP

ML4810CP Summary of contents

Page 1

High Frequency Power Supply Controller 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 ...

Page 2

ML4810, ML4811 PIN CONFIGURATION ML4810 16-Pin DIP (P16) 16-Pin SOIC (S16W) INV E/A OUT RESET RAMP 7 10 SOFT START 8 9 ...

Page 3

ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Supply Voltage (Pins 18, 16) ...................................... 25V Output Current, ...

Page 4

ML4810, ML4811 ELECTRICAL CHARACTERISTICS PARAMETER ERROR AMPLIFIER (Continued) CMRR PSRR Output Sink Current Output Source Current Output High Voltage Output Low Voltage Unity Gain Bandwidth Slew Rate PWM COMPARATOR Pin 8 Bias Current Duty Cycle Range Pin 3 Zero DC ...

Page 5

FUNCTIONAL DESCRIPTION SOFT START AND CURRENT LIMIT The ML4810/11 offers a unique system of fault detection and reset. Most PWM controllers use a two threshold method which relies on the buildup of current in the output inductor during a fault. ...

Page 6

ML4810, ML4811 OSCILLATOR The ML4811 oscillator charges the external capacitor (C with a current (I ) equal to 3/R . When the capacitor SET T voltage reaches the upper threshold (Ramp Peak), the comparator changes state and the capacitor discharges ...

Page 7

ERROR AMPLIFIER The ML4811 error amplifier is a 5.5MHz bandwidth 12V/ sec slew rate op-amp with provision for limiting the positive output voltage swing (Output Inhibit line) for ease in implementing the soft start function. 4.70 2.20 1.00 0.47 0.22 ...

Page 8

ML4810, ML4811 3 2 SOURCE 1 SINK 0 0 OUT (A) Figure 13. Saturation Curves 100 200 300 TIME (ns) Figure 15. Rise/Fall Time (C 8 1.0 1.5 Figure 14. Rise/Fall Time (C ...

Page 9

ML4810, ML4811 9 ...

Page 10

ML4810, ML4811 PHYSICAL DIMENSIONS 16 PIN 0.02 MIN (0.50 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN) 0.400 - 0.414 (10.16 - 10.52) 16 PIN 0.024 - 0.034 (0.61 - 0.86) ...

Page 11

PHYSICAL DIMENSIONS 20 PIN 0.060 MIN (1.52 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN) 0.498 - 0.512 (12.65 - 13.00) 20 PIN 0.024 - 0.034 0.050 BSC (0.61 - 0.86) ...

Page 12

... ML4810, ML4811 ORDERING INFORMATION PART NUMBER ML4810CP ML4810CS ML4811CP ML4811CS is a registered trademark of Micro Linear Corporation © Micro Linear 1997 Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; ...

Related keywords