SR037 データシートの表示（PDF） - Supertex Inc

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SR037

Inductorless, Dual Output Off-Line Regulators

Supertex Inc 

Applications Information, continued

120VAC

or

230VAC

Fuse

GN2470

Unregulated Voltage

220µF

1.0µF

Vz

5.1V

Gate Source

HVIN SR037 VOUT 5.0V

Logic

Control

Circuit

GND

1.0µF

SR036/SR037

5V Coil

Relay

Figure 6: Driving 5V Relay Coils with Zener Diode Clamp

The circuit shown in Figure 6 uses the SR037 to supply a

regulated 5.0V for the logic control circuitry. A 5.1V Zener diode

is used in parallel with the 5.0V relay coil to ensure that the relay

coil’s maximum operating voltage is not exceeded. The Zener

diode also acts as the catch diode when the coil is switched to the

off state. An external series resistor is used to limit the amount of

Zener current.

120VAC

or

230VAC

Fuse

GN2470

Unregulated Voltage

220µF

1.0µF

Gate Source

HVIN SR036 or VOUT

SR037

GND

VREG

1.0µF

330Ω

Figure 7: Driving LEDs from 120VAC

The circuit shown in Figure 7 uses the SR036 or SR037 to drive

12 high efficiency red LEDs from an AC line. The average LED

current is approximately 20mA.

330Ω

B092005

11

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