SUPPORT PRODUCTS
FOR MICRO LINEAR I.C.'S
Premier
P
M
Magnetics Inc.
"INNOVATORS IN MAGNETICS TECHNOLOGY"
➊ Magnetics Micro Linear's ML4824 Switcher
GENERAL APPLICATION ML4824-1
➊ Magnetics For Micro Linear's Ballast IC's
100WATT PFC UNIVERSAL OFF-LINE SWITCHING MAGNETICS
Premier Magnetics' TSD-735 Switch Mode Transformer was designed for use with MICRO LINEAR'S ML4824-1 PFC/PWM
Combination off-line controller IC, in the Two Transistor Single-Ended Forward Converter Configuration. This
converter topology can provide isolated multiple outputs with efficiencies up to 90%. Premiers' TSD-735 transformer
has been optimized to provide maximum power throughput and to provide the necessary bias voltage for the
ML4824-1 and it's auxiliary circuitry.
The ML4824-1 from Micro Linear is highly integrated power supply controller, incorporating a PFC front end operating
at 100KHz, and a synchronized PWM switching regulator running @ 50KHz. This combination provides all necessary
functions for a Universal-Input, Power Factor Corrected DC power supply in the 50 to 500W output range. The TSD-
734 boost inductor and TSD-735 output transformer are critical to the performance of the circuit. Together they define
the harmonic reduction, efficiency, output power and the size of the Power Factor Correction and DC output stages.
Below is a typical universal input, high precision application circuit utilizing Micro Linear's ML4824-1 PFC/PWM control
IC. The AC mains voltage is power factor corrected and boosted to 382VDC by the PFC half of the ML4824-1 and
the TSD-734 PFC boost inductor. The PWM half of the ML4824-1 and the PMGD-03 gate drive transformer then provide
the MOSFET gate drives for operating the TSD-735 output transformer which converts the 382VDC hot rail to a
regulated 12VDC, 100W output. Recommended component values can be obtained from Micro-Linear's ML4824-
1 application notes. Evaluation boards are available from Micro Linear.
SCHEMATIC
D2
L1
TSD-734
D1
F1
+382VDC HOT RAIL
Q2
3
6
LINE
>>
~
+
-
D
S
D
S
Q1
G
90-260Vac
50/60Hz
R17
G
BR1
C4
R2A
R2B
R27
C1
C5
R1A
R1B
R7A
R7B
C25
NEUT
>>
~
T1
R21
D9
R30
PMGD-03
(TSD-736)
D5
6
1
C3
D7
L2
R3
R4
T2
TSD-735
VTP-05007
D11A
4
+12V
3
>>
C2
3
11 & 12
C30
C24
Vout
12V
R15
D11B
C21
1
R18
C20
D
S
Q3
G
7 & 8
6
>>
RETURN
R14
D3
D6
C12
5
R19
R20A
R20B
C17
R24
R23
R28
R9
R13
R16
Q4
C22
C7
R12
U2
R6
D4
C7
C
E
A
C
R22
ML4824
1
2
3
4
5
6
7
8
16
IEAO
IAC
ISENSE
VRMS
SS
VEAO
FB
REF
VCC
V01
V02
C10
15
14
13
12
11
10
9
R11
R26
VDC
RAMP1
RAMP2
C15
C16
C13
C14
GND
DCILIM
U3
R
C23
R8
R10
D10
C8
C9
C
A
R5A
R5B
R5C
R5D
C19
C18
C11
D8
R25
Specifications subject to change without notice.
mlsuport 09/98
20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: (949) 452-0511 • FAX: (949) 452-0512 • http://www.premiermag.com
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