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ML4826

更新时间： 2024-02-22 17:38:19
品牌 Logo 应用领域
MICRO-LINEAR 功率因数校正控制器
页数 文件大小 规格书
16页 299K
描述
PFC and Dual Output PWM Controller Combo

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中文翻译

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ML4826 数据手册

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June 1997  
ML4826*  
PFC and Dual Output PWM Controller Combo  
GENERAL DESCRIPTION  
FEATURES  
The ML4826 is a high power controller for power factor  
corrected, switched mode power supplies. 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 IEC1000-3-2  
specifications. The ML4826 includes circuits for the  
implementation of a leading edge, average current “boost”  
type power factor correction and a trailing edge, pulse  
width modulator (PWM) with dual totem-pole outputs.  
■ Internally synchronized PFC and PWM in one IC  
■ Low total harmonic distortion  
■ Reduced ripple current in the storage capacitor  
between the PFC and PWM sections  
■ Average current, continuous boost, leading edge PFC  
■ High efficiency trailing edge PWM with dual  
The device is available in two versions; the ML4826-1  
totem-pole outputs  
(f  
= f ) and the ML4826-2 (f  
= 2 x f ).  
PWM  
PFC  
PWM PFC  
Doubling the switching frequency of the PWM 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. The PWM section can be operated  
in current or voltage mode at up to 250kHz and includes a  
duty cycle limit to prevent transformer saturation.  
■ Average line voltage compensation with brown-out  
control  
■ PFC overvoltage comparator eliminates output  
“runaway” due to load removal  
■ Current-fed multiplier for improved noise immunity  
■ Overvoltage protection, UVLO, and soft start  
BLOCK DIAGRAM  
* This Part Is End Of Life As Of August 1, 2000  
20  
11  
1
17  
POWER FACTOR CORRECTOR  
V
CC  
AGND  
IEAO  
VEAO  
V
CCZ  
OVP  
V
V
REF  
VEA  
FB  
13.5V  
7.5V  
REFERENCE  
+
IEA  
18  
15  
3.5kΩ  
19  
-
-
2.7V  
-1V  
-
+
-
2.5V  
AC  
+
+
S
Q
I
2
4
3
+
-
8V  
GAIN  
V
I
R
S
Q
Q
RMS  
MODULATOR  
PFC OUT  
3.5kΩ  
PFC I  
LIMIT  
SENSE  
RAMP 1  
R
Q
8
7
R C  
T T  
OSCILLATOR  
V
CC2  
x 2  
(-2 VERSION ONLY)  
RAMP 2  
16  
14  
S
Q
DUTY CYCLE  
LIMIT  
9
PWM 2  
8V  
T
Q
-
V
PGND  
1.5V  
DC  
6
5
+
V
S
Q
Q
CC  
V
CC2  
-
V
OK  
1V  
IN  
PWM 1  
PGND  
V
-
50µA  
8V  
FB  
SS  
+
-
13  
12  
R
2.5V  
+
+
DC I  
LIMIT  
V
DC I  
LIMIT  
10  
UVLO  
CCZ  
PULSE WIDTH MODULATOR  
1
1234567...16

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