SSC2006SA datasheet(17/23 Pages) SANKEN

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SSC2006SA

SSC2006SA - DSJ Rev.1.6

SANKEN ELECTRIC CO.,LTD.

Aug.11, 2015

http://www.sanken-ele.co.jp/en/

DVCC

RCS

RST

VCC

GND

CVCC

CCP

DZVCC

DFW

VOUT

LINE

GND

VAC

VCCP

Figure 9-5 VCC pin peripheral circuit

(Power supply from auxiliary winding)

9.2.8

Power MOSFET, Q1

Choose a power MOSFET having proper margin of

VDSS against output voltage, VOUT. The size of heat sink

is chosen taking into account some loss by switching

and ON resistance of MOSFET.

The loss PRDS(ON) by on-resistance, RDS(ON) of power

MOSFET is calculated using IDRMS of the result of

Equation (14) as follows:





125

)

(

DRSM

)

(

RDS







(W)

(21)

Where,

RDS(ON)125°C : ON resistance of MOSFET

at Tch = 125 °C (Ω)

9.2.9

Boost Diode, DFW

Choose a boost diode having proper margin of a peak

reverse voltage VRSM against output voltage VOUT.

A fast recovery diode is recommended to reduce the

switching noise and loss. Please ask our staff about our

lineup. The size of heat sink is chosen taking into

account some loss by VF and recovery current of boost

diode.

The loss of VF, PDFW is expressed as follows:

OUT

DFW





(W)

(22)

Where,

: Forward voltage of boost diode (V)

IOUT

: Out put current (A)

9.2.10 Bypass Diode, DBYP

Bypass diode protects the boost diode from a large

current such as an inrush current. A high surge current

tolerance diode is recommended. Please ask our staff

about our lineup.

9.2.11 Output Capacitor, C2

Apply proper design margin to accommodate the

ripple current, the ripple voltage and the temperature rise.

Use of high ripple current and low impedance types,

designed

for

switch-mode

power

supplies,

recommended, depending on their purposes.

In order to obtain C2 value CO, calculate both

Equation (23) and (25) described in following and select

a larger value.

(1) Ripple voltage considered

)

(

OUT

LINE

OUT









(F)

(23)

Where,

VOUTRIPPLE : C2 ripple voltage (10 VPP for example)

fLINE

: Line frequency (Hz)

IOUT

: Output current (A)

The C2 voltage is expressed Equation (24).

When the output ripple is high, the VC2 voltage may

reach to Overvoltage Protection voltage, VOVP in near

the maximum value of VC2, or input current waveform

may be distorted due to the stop of the boost operation

in near the minmum value of VC2. It is necessary to

select large CO value or change the setting of output

voltage (boost voltage).

)

(

OUT





(V)

(24)

(2) Output hold time considered

)

MIN

(

OUT

HOLD

OUT







(F)

(25)

Where,

tHOLD

: Output hold time (s)

VOUT(MIN) : Minmum output voltage of C2 during

output hold (V)

If tHOLD = 20 ms, PO = 200 W, η = 90 % and the

output voltage = 330 V to 390 V, CO value is derived

as 205 μF. Thus, CO value of approximately 220 μF is

connected.

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