SR037SG データシートの表示（PDF） - Supertex Inc

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SR037SG

Inductorless, Dual Output Off-Line Regulators

Supertex Inc 

Applications Information, continued

SR036/SR037

Fuse

AC line

Figure 8:

Precision current drive for

LED String from AC Line

Features:

1. Precision Current Regulator

2. Zener Voltage Boost

3. PWM Dimming (optional)

4. EMI Filter (optional)

Vunreg = Vz + 14V

= VLED + 8V

R = Vunreg / 1.5mA

GN2470

EMI Filter

(optional)

Gate

HVIN Supertex

SR037

GND

Zener

Voltage

Vz

Boost

Source

1.0µF + 47µF

10K

Vunreg

+

VLED

R

ILED

-

+8V

PWM Dimming Constant Current

(optional)

Regulator

Iled = 2.5V / Rs < 40mA

The circuit uses the SR037or SR036 and GN2470 to drive a string of LEDs from AC power line.

The LED current is regulated at up to 40mA.

The LED string voltage can be up to AC line voltage (120V for 120Vac / 230V for 230VAC).

Fuse

AC line

Figure 9:

Simple current drive for LED

String from AC Line

Features:

1. Simple Current Regulator

2. Automatic Voltage Boost

3. Zener Boost Voltage Limit (optional)

4. EMI Filter (optional)

GN2470

Vunreg = VLED + 8V

< Vz + 16V

EMI Filter

(optional)

1.0µF + 100µF

Gate

HVin Supertex

SR037

GND

Source

R = Vunreg / 1.0mA

Vunreg

+

VLED ILED

R

-

220nF

100k

Vz Zener Boost Voltage

Limit (optional)

+

Vbe

Rs

-

Simple Current Regulator

Iled = Vbe / Rs < 40mA

The circuit uses the SR037 or SR036 and GN2470 to drive a string of LEDs from AC power line.

The LED current is regulated at up to 40mA.

The LED string voltage can be up to AC line voltage (120V for 120Vac / 230V for 230VAC).

12

B092005

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