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SUPPLY

MANAGEMENT

internal

supply

UVLO

start

M-level

VCC

1

2

3

GND

S1

CTRL

FREQUENCY

CONTROL

VOLTAGE

CONTROLLED

OSCILLATOR

DEMAG

SHORT

PROTECTION

LOGIC

LOGIC

OVER-

VOLTAGE

PROTECTION

OVERPOWER

PROTECTION

short

winding

soft

start

S2

OVER-

TEMPERATURE

PROTECTION

SQ

R

UVLO

Q

MAXIMUM

ON-TIME

PROTECTION

POWER-ON

RESET

−1

UP/DOWN

COUNTER

VALLEY

OCP

TEA1533P

TEA1533AP

100

mV

clamp

DRIVER

START-UP

CURRENT SOURCE

0.88 V

0.5 V

5

Isense

6

DRIVER

MGU506

4

DEM

8

DRAIN

7

HVS

n.c.

OCP

LEB

blank

Iss

Iprot(CTRL)

2.5 V

burst

detect

SQ

R

VCC < 4.5 V

or UVLO

(TEA1533AP)

Q

50

mV

Iprot(DEM)

Fig.2 Block diagram.