ML4833CS Ver la hoja de datos (PDF) - Micro Linear Corporation

Número de pieza

componentes Descripción

Fabricante

ML4833CS

Electronic Dimming Ballast Controller

Micro Linear Corporation 

TRANSCONDUCTANCE AMPLIFIERS

The PFC voltage feedback amplifier is implemented as an

operational transconductance amplifier. It is designed to

have low small signal forward transconductance such that

a large value of load resistor (R1) and a low value

ceramic capacitor (<1µF) can be used for AC coupling

(C1) in the frequency compensation network. The

compensation network shown in Figure 3 will introduce a

zero and a pole at:

fZ

=

2π

1

R1C1

fP

=

1

2π R1C2

(2)

ML4833

PVFB/OVP

18

–

2.5V

+

R1

C2

C1

Figure 3. Compensation Network

EMI

FILTER

SINE

RAMP

CLK

PFC OUT

L

PIFB

2

–A

RSENSE

OUT A

14

SINE

+

–

SW2

SW1

RQ

VOUT

L

A

RA

M

INVERTER

LAMP

P

NETWORK

L

RB

A

M

P

18 PVFB/OVP

S

OSC

V TO I

CLK

PEAO –

+

VREF1

10 CRAMP

CRAMP

1

PEAO

R1

C2

C1

Figure 2. ML4833 PFC Controller Section

7

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