4

General description

4.1

Block diagram

Figure 23. Block diagram

VCC

DRAIN

Internal Supply bus

RSENSE

REGULATOR

4V

HV

Start up

THERMAL

DIODE

(OTP)

GND

HV DISABLE

LOGIC

SOFT START

JITTERED

OSCILLATOR

E/A

+

-

+

-

FB

VFB_REF

PWM

-

+

TURN ON

LOGIC

COMP

OCP

UVLO VCC

VCC_clamp

tOVL filter

LEB

S

R

Q

OTP

OCP

-

+

IDLIM ref

LIGHT LOAD PFM

PROTECTION

LOGIC

tRESTART

OVP LOGIC

tOVP_REST

OVP

TSD LOGIC

tRESTART

RG

Vz

IHV

ICH*

- VOVP_th

+

-

VUVP_th

tOVP_DEB filter

UVP

S

R

Q

IC DISABLE

LOGIC

IC_DIS

IC_DIS

tUVP_REST filter

IC_DIS_SET

IC_DIS_RESET

tUVP_DEB filter

+

4.2

Typical power capability

Table 8. Typical power

Vin: 230 VAC

Vin: 85-265 VAC

Adapter (1)

Open Frame (2)

Adapter (1)

Open Frame (2)

27 W

31 W

16 W

19 W

1. Typical continuous power in non-ventilated enclosed adapter measured at 50°C ambient.

2. Maximum practical continuous power in an open frame design at 50°C ambient, with adequate heat sinking.

VIPER31

General description

DS13285 - Rev 6

page 13/39