TSD-734 Datasheet, PDF (1/2 Pages) Premier Magnetics, Inc. – SUPPORT PRODUCTS FOR MICRO LINEAR I.C.S

P ^Premier
SUPPORT PRODUCTS
M _{Magnetics Inc. FOR MICRO LINEAR I.C.'S}
"INNOVATORS IN MAGNETICS TECHNOLOGY"
– Magnetics Micro Linear's ML4824 Switcher
— Magnetics For Micro Linear's Ballast IC's
GENERAL APPLICATION ML4824-1
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.
F1
LINE >>
90-260Vac
50/60Hz
NEUT >>
D2
SCHEMATIC
~+
L1
TSD-734
3
6
Q1
D1
D
+382VDC HOT RAIL
D
Q2
BR1
C1
R2A
R27
~-
R1A
R21
R2B
R1B
C3
G
S
D9
C4
C5
R7A
R7B
R17
T1
C25
PMGD-03
(TSD-736)
1
6
G
S
R30
D7
R3
C2
R4
C30
4
3
D5
T2
TSD-735
3
11 & 12
D11A
L2
VTP-05007
C24
R15
C20
Q3
D
D11B
C21
1
7 &8
R14
G
S
D6
6
D3
R19
R20A
R20B
C12
5
>> +12V
Vout
R18
>>
12V
RETURN
R5A
R5B
R5C R5D
C19
C7
R6
R12
C7
ML4824
1 _IEAO
VEAO ¹⁶
2 _IAC
FB ¹⁵
3 _ISENSE
REF ¹⁴
4 _VRMS
VCC ¹³
5 _SS
V01 ¹²
6 _VDC
7 _RAMP1
V02 ¹¹
GND ¹⁰
8 _RAMP2
DCILIM ⁹
R8
D8
C18
C11
C17
R28
R9
R13
Q4
D4
C15 C16
R10
R11
C13 C14
C8 C9
D10
R24
R16
R23
C22
U2
C
A
R22
C10
C
E
R26
U3
C
R
A
C23
R25
Specifications subject to change without notice.
mlsuport 09/98
20381 BARENTS SEA CIRCLE, LAKE FOREST, CA 92630 • TEL: [phone] • FAX: [phone] • http://www.premiermag.com
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