VIPER28

Block diagram

Doc ID 15028 Rev 5

3/32

1

Block diagram

2

Typical power

Figure 2.

Block diagram

2nd OCP

THERMAL

SHUTDOWN

BURST

OTP

LEB

OCP

BLOCK

OVP DETECTION

LOGIC

HV_ON

S

R

Q

Rsense

UVLO

+

-

Disable

TURN-ON

LOGIC

+

-

PWM

LEB

OCP

2nd OCP

LOGIC

OSCILLATOR

OLP

Tov l

BLOCK

SUPPLY

& UVLO

S

R

Q

HV_ON

PWM

BLOCK

BURST-MODE

LOGIC

SOFT

START

OVP

GND

FB

DRAIN

CONT

Ref erence Voltages

OTP

OVP

OLP

&

Internal Supply bus

BURST

Tovl

2nd OCP

THERMAL

SHUTDOWN

BURST

OTP

LEB

OCP

BLOCK

OVP DETECTION

LOGIC

HV_ON

S

R

Q

Rsense

UVLO

+

-

Disable

TURN-ON

LOGIC

+

-

PWM

LEB

OCP

2nd OCP

LOGIC

OSCILLATOR

OLP

Tov l

BLOCK

SUPPLY

& UVLO

S

R

Q

HV_ON

PWM

BLOCK

BURST-MODE

LOGIC

SOFT

START

OVP

GND

VDD

FB

DRAIN

CONT

Ref erence Voltages

OTP

OVP

OLP

&

Internal Supply bus

BURST

Tovl

EPT

EPT

Table 2.

Typical power

Part number

VIPER28

18 W

20 W

10 W

12 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.