SPI-8000A datasheet(3/3 Pages) SANKEN

Part #	SPI-8000A

Description	Surface Mount, Separate Excitation Step-down Switching Mode Regulator ICs

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Manufacturer	SANKEN [Sanken electric]

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

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54

ICs

■Ta-PD Characteristics

■Typical Connection Diagram

SPI-8010A

C1: 220

µF/63V

C2: 470

µF/25V

C3: 0.1

µF

C4: 1000pF

C5: 0.1

µF

C6: 0.047

µF

C7: 0.1

µF

C8: 0.1

µF

C9: 6800pF

R1: 47

Ω

L1: 47

µH

D1: SPB-G56S

(Sanken)

Diode D1

• Be sure to use a Schottky-barrier diode for D1. If other diodes like fast recovery diodes are used, ICs may be destroyed because of the reverse voltage

generated by the recovery voltage or ON voltage.

Choke coil L1

• If the winding resistance of the choke coil is too high, the efficiency may drop below the rated value.

• As the overcurrent protection starting current is about 4.5A, take care concerning heat radiation from the choke coil caused by magnetic saturation due to

overload or short-circuited load.

Capacitors C1, C2

• As large ripple currents flow through C1 and C2, use high-frequency and low-impedance capacitors aiming for switching-mode-power-supply use. Especially

when the impedance of C2 is high, the switching waveform may become abnormal at low temperatures. For C2, do not use a capacitor with an extremely low

equivalent series resistance (ESR) such as an OS capacitor or a tantalum capacitor, which may cause an abnormal oscillation.

Resistors R2, R3

•R2 and R3 are the resistors to set the output voltage. Set their values so that IREF becomes approx. 2mA. Obtain R2 and R3 values by the following formula:

To create the optimum operating conditions, place the components as close as possible to each other.

Reg

CE/SS

53

4

VIN

SWOUT

VREF

VIN

GND

V0

GND

11

C5

Comp

14

12

C6

C9

C3

D1

L1

R2

R3

IREF

AGND

DGND

B.S

SPI-8010A

1

15

7

R1

C4

C1

C7

+

C2

C8

+

Note 1: The efficiency depends on the input voltage and the output cur-

rent. Therefore, obtain the value from the efficiency graph and

substitute the percentage in the formula above.

Note 2: Thermal design for D1 must be considered separately.

VO : Output voltage

VIN : Input voltage

IO : Output current

ηχ : Efficiency (%)

VF : Diode D1 forward voltage

SPB-G56S···0.4V(IO=2A)

3.00

2.50

2.00

1.50

1.00

0.50

0

–30

0

25

50

75

100

125

Ambient Temperature Ta (

°C)

j-a:62.5

°C/W(0.84cm2)

j-a:47.6

°C/W(8.64cm2)

j-a:41.7

°C/W(30.8cm2)

θ

PD=VO • IO

100

–1 –VF • IO 1–

VO

ηχ

VIN

1-1-2 Switching Mode Regulator ICs

R2=

(VOUT–VREF)

=

(VOUT–1)

(

Ω), R3 =

VREF

=

1

500(

Ω)

IREF

2

×10–3

IREF

2

×10–3

=

.

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