ML4802IS 반도체 회로 부품 판매점
PFC/PWM Controller Combo with Green Mode
|
|
 Micro Linear |
August 2000
PRELIMINARY
ML4802
PFC/PWM Controller Combo with Green Mode
GENERAL DESCRIPTION
The ML 4802 is a controller for power factor corrected,
switched mode power supplies that offers Green Mode
operation and reduced start-up and operating currents.
Green Mode is an efficiency improving circuit feature
which operates automatically in low power situations.
This feature helps meet the demands of Energy Star™
programs.
Power Factor Correction (PFC) offers the use of lower cost
bulk capacitors, reduces power line loading and stress on
the switching FETs. The ML4802 includes circuits for the
implementation of a leading edge, average current,
“boost” type power factor corrector and a trailing edge
Pulse Width Modulator (PWM).
The PFC frequency of the ML4802 is automatically
synchronized to be one half that of the PWM. This
technique allows the user to design with smaller PWM
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 brown-out protection.
FEATURES
s Internally synchronized PFC and PWM in one IC
s Green Mode maximizes efficiency during low power
standby operation
s Low supply current
(Start-up 200µA typ., operating 5.5mA typ.)
s Average current continuous boost leading edge PFC
s High efficiency trailing edge PWM can be configured
for current mode operation
s Reduced ripple current in the storage capacitor
between the PFC and PWM sections
s PFC overvoltage comparator eliminates output
“runaway” due to load removal
s Current fed gain modulator for improved noise
immunity
s Overvoltage protection, UVLO, and soft start
BLOCK DIAGRAM
VEAO
16
IEAO
1
VFB 15
2.5V
IAC 2
VRMS 4
ISENSE 3
VEA
-
+
1.8kΩ
IEA
+
–
GAIN
MODULATOR
8V
1.8kΩ
POWER FACTOR CORRECTOR
2.75V
+
- OVP
PFC
CONTROLLER
-1V +
-
PFC ILIMIT
VCC
13
7.5V
REFERENCE
14 VREF
PFC
OUTPUT
DRIVER
12 PFC OUT
RAMP 1 8
RT/CT 7
RAMP 2 9
VDC 6
SS 5
8V VLS
1.25V
VCC
25µA
8V
-
+
÷2
OSCILLATOR
DC LIMIT
VFB
VDC
GREEN
MODE
CONTROLLER
GREEN
MODE
VIN OK
DC ILIMIT
VFB -
+
-
2.43V +
1.5V
-
+
PULSE WIDTH MODULATOR
PWM
OUTPUT
DRIVER
11 PWM OUT
1
ML4802
PIN CONFIGURATION
ML4802
16-Pin PDIP (P16)
16-Pin Narrow SOIC (S16N)
IEAO
IAC
ISENSE
VRMS
SS
VDC
RT/CT
RAMP 1
1 16 VEAO
2 15 VFB
3 14 VREF
4 13 VCC
5 12 PFC OUT
6 11 PWM OUT
7 10 GND
8 9 RAMP 2
TOP VIEW
PIN DESCRIPTION
PIN NAME
FUNCTION
1 IEAO
PFC current error amplifier output
2 IAC
PFC gain control reference input
3 ISENSE
Current sense input to the PFC current
limit comparator
4 VRMS
Input for PFC RMS line voltage
compensation
5 SS
Connection point for the PWM soft start
capacitor
6 VDC
PWM feedback voltage input
7 RT/CT
Connection for master (PWM) oscillator
frequency setting components
8 RAMP 1 PFC ramp input
PIN NAME
FUNCTION
9 RAMP 2
PWM current feedback/overcurrent
limit input
10 GND
Ground
11 PWM OUT PWM driver output
12 PFC OUT PFC driver output
13 VCC
Positive supply input
14 VREF
Buffered output for the internal 7.5V
reference
15 VFB
PFC voltage error amplifier input
16 VEAO
PFC voltage error amplifier output
2 Datasheet August 2000
|
PDF 파일 내의 페이지 : 총 15 페이지
제조업체: Micro Linear
( ml )
ML4802IS controller
데이터시트 다운로드 :
[ ML4802IS.PDF ]
[ ML4802IS 다른 제조사 검색 ]
국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
관련 데이터시트
ML4802IP
PFC/PWM Controller Combo with Green Mode - Fairchild
ML4802IP
PFC/PWM Controller Combo with Green Mode - Micro Linear
ML4802IS
PFC/PWM Controller Combo with Green Mode - Fairchild
ML4802IS
PFC/PWM Controller Combo with Green Mode - Micro Linear