ML4805IS Micro Linear, ML4805IS Datasheet

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ML4805IS

Manufacturer Part Number
ML4805IS
Description
Variable Feedforward PFC/PWM Controller Combo
Manufacturer
Micro Linear
Datasheet
GENERAL DESCRIPTION
The ML4805 is a controller for power factor corrected,
switched mode power supplies. Similar to the ML4801,
the ML4805 may be used for voltage mode operation. Key
features of this combined PFC and PWM controller are
low start-up and operating currents. Power Factor
Correction (PFC) allows the use of smaller, lower cost
bulk capacitors, reduces power line loading and stress on
the switching FETs, and results in a power supply that
fully complies with IEC1000-2-3 specifications. The
ML4805 includes circuits for the implementation of a
leading edge, average current “boost” type power factor
correction and a trailing edge pulse width modulator.
The PFC frequency of the ML4805 is automatically set at
half that of the PWM frequency generated by the internal
oscillator. This technique allows the user to design with
smaller output components while maintaining the
optimum operating frequency for the PFC. An over-
voltage comparator shuts down the PFC section in the
event of a sudden decrease in load. The PFC section also
includes peak current limiting and input voltage brown-
out protection.
BLOCK DIAGRAM
17
11
2
4
3
8
7
9
6
5
I AC
V FB
V RMS
I SENSE
RAMP 1
R T C T
RAMP 2
V DC
SS
AGND
2.5V
Variable Feedforward PFC/PWM Controller Combo
V CC
25µA
8V
8V
+
-
VEA
VEAO
MODULATOR
1.25V
GAIN
18
1.6k
1.6k
+
-
+
IEA
IEAO
+
-
1
OSCILLATOR
+
-
2.5V
V FB
POWER FACTOR CORRECTOR
PULSE WIDTH MODULATOR
+
-
V IN OK
÷2
DUTY CYCLE
LIMIT
FEATURES
Internally synchronized PFC and PWM in one IC
Low start-up current (200µA typ.)
Low operating current (5.5mA typ.)
Low total harmonic distortion
Reduces ripple current in the storage capacitor
between the PFC and PWM sections
Average current continuous boost leading edge PFC
High efficiency trailing edge PWM optimized for
voltage mode operation
Current fed gain modulator for improved noise
immunity
Brown-out control, overvoltage protection, UVLO, and
soft start
1.5V
2.75V
-1V
PFC I LIMIT
+
-
OVP
+
+
-
-
DC I LIMIT
V CC
V CC
UVLO
R
R
R
S
S
S
Q
Q
Q
Q
Q
Q
REFERENCE
7.5V
15
ML4805
V CC
November 1998
PWM OUT
PRELIMINARY
PFC OUT
PGND
V REF
I LIM
10
16
14
12
13
1

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ML4805IS Summary of contents

Page 1

Variable Feedforward PFC/PWM Controller Combo GENERAL DESCRIPTION The ML4805 is a controller for power factor corrected, switched mode power supplies. Similar to the ML4801, the ML4805 may be used for voltage mode operation. Key features of this combined PFC and ...

Page 2

ML4805 PIN CONFIGURATION PIN DESCRIPTION PIN NAME FUNCTION 1 IEAO PFC transconductance current error amplifier output 2 I PFC gain control reference input Current sense input to the PFC current SENSE limit comparator 4 V Input for ...

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 ............................................................................................... I Voltage .................................................. - ...

Page 4

ML4805 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER OVP COMPARATOR Threshold Voltage Hysteresis PFC I COMPARATOR LIMIT Threshold Voltage PFC I Threshold - Gain Modulator Output LIMIT Delay to Output DC I COMPARATOR LIMIT Threshold Voltage Input Bias Current Delay to Output V ...

Page 5

ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER REFERENCE Output Voltage Line Regulation Load Regulation Temperature Stability Total Variation Long Term Stability PFC Minimum Duty Cycle Maximum Duty Cycle Output Low Voltage Output High Voltage Rise/Fall Time PWM DC Duty Cycle Range V Output ...

Page 6

ML4805 FUNCTIONAL DESCRIPTION The ML4805 consists of a combined average-current- controlled, continuous boost Power Factor Corrector (PFC) front end and a synchronized Pulse Width Modulator (PWM) back end distinguished from earlier combo controllers by its dramatically reduced start-up ...

Page 7

FUNCTIONAL DESCRIPTION 18 VEAO V FB VEA IEA 1. 2.5V + – GAIN V RMS MODULATOR 4 1.6k I SENSE 3 RAMP (except at unusually inversely ...

Page 8

ML4805 FUNCTIONAL DESCRIPTION Overvoltage Protection The OVP comparator serves to protect the power circuit from being subjected to excessive voltages if the load should suddenly change. A resistor divider from the high voltage DC output of the PFC is fed ...

Page 9

FUNCTIONAL DESCRIPTION operating frequency can typically be approximated by: = EXAMPLE: For the application circuit shown in the data sheet, with the oscillator running at ´ ´ = ´ Solving for yields 2 ...

Page 10

ML4805 FUNCTIONAL DESCRIPTION Generating V CC The ML4805 is a voltage-fed part. It requires an external 15V±10% or better Zener shunt voltage regulator, or some other controlled supply, to regulate the voltage supplied to the part at 15V nominal. This ...

Page 11

V FB (V) Figure 5. I vs. V VEAO FB 200 160 120 (V) Figure OTA 180 ...

Page 12

PHYSICAL DIMENSIONS 18 PIN 0.045 MIN (1.14 MIN) (4 PLACES) 0.170 MAX (4.32 MAX) 0.125 MIN (3.18 MIN) 0.449 - 0.463 (11.40 - 11.76) 18 PIN 0.024 - 0.034 0.050 BSC (0.61 - 0.86) ...

Page 13

... PART NUMBER ML4805CP ML4805CS ML4805IP ML4805IS © Micro Linear 1998 registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; ...

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