Philips TEA1506P, TEA1506AP, TEA1506T, TEA1506AT Technical data

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TEA1506P; TEA1506AP;
TEA1506T; TEA1506AT

GreenChipII SMPS control IC

Product specification 2003 Sep 09

Philips Semiconductors Product specification

GreenChipII SMPS control IC

FEATURES
Distinctive features

• Universal mains supply operation (70 to 276 V AC)

• High level of integration; giving a low external

component count.

Green features

• Valley or zero voltage switching for minimum switching
losses

• Efficient quasi-resonant operation at high power levels

• Frequency reductionat low power standby for improved
system efficiency (≤3W)

• Cycle skipping mode at very low loads.

Protection features

• Safe restart mode for system fault conditions

• Continuous mode protection by means of

demagnetization detection (zero switch-on current)

• Accurateand adjustable overvoltage protection(latched
in TEA1506; safe restart in TEA1506A)

• Short winding protection

• Undervoltage protection (foldback during overload)

• Overtemperature protection

• Low and adjustable overcurrent protection trip level

• Soft (re)start.

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

APPLICATIONS

Besides typical application areas, i.e. TV and monitor
supplies, the devicecan be usedin adapters andchargers
and all applications that demand an efficient and
cost-effective solution up to 150 W. Unlike the other
GreenChipII control ICs, the TEA1506 has no internal
high voltage start-up source and needs to be started by
means of an external bleeder resistor.

1

2

TEA1506P

TEA1506AP

3

4

8

7

6

5

2003 Sep 09 2

MDB504

Fig.1 Basic application diagram.

Philips Semiconductors Product specification

GreenChipII SMPS control IC

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

GENERAL DESCRIPTION

The GreenChip
Switched Mode Power Supply (SMPS) control ICs. A high
level of integration leads to a cost effective power supply
with a low number of external components.

(1) GreenChip is a trademark of Koninklijke Philips

Electronics N.V.

ORDERING INFORMATION

TYPE NUMBER

TEA1506P DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
TEA1506AP
TEA1506T SO14 plastic small outline package; 14 leads; body width 3.9 mm SOT108-1
TEA1506AT

(1)

II is the second generation of green

NAME DESCRIPTION VERSION

The special built-in green functions allow the efficiency to
be optimum at all power levels. This holds for
quasi-resonant operation at high power levels, as well as
fixed frequency operation with valley switching at medium
power levels. At low power (standby) levels, the system
operates at a reduced frequency and with valley detection.

Highly efficient and reliable supplies can easily be
designed using the GreenChipII control IC.

PACKAGE

2003 Sep 09 3

Philips Semiconductors Product specification

GreenChipII SMPS control IC

BLOCK DIAGRAM

4

DEM

(7)

OVER-

VOLTAGE

DRAIN

8

(14)

prot(DEM)

I

clamp

DRIVER

6

(11)

DRIVER

PROTECTION

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

sense

I

5

(9)

0.5 V

ss

I

S2

soft

start

OVERPOWER

0.88 V

LEB

blank

OCP

short

winding

MDB505

PROTECTION

, full pagewidth

SUPPLY

MANAGEMENT

VALLEY

UVLO start

supply

internal

100

LOGIC

VOLTAGE

OSCILLATOR

CONTROLLED

mV

UP/DOWN

COUNTER

CONTROL

FREQUENCY

LOGIC

SQ

RESET

POWER-ON

−1

3.8 V

Q
R

UVLO

SQ

< 4.5 V

CC

V

OVER-

TEMPERATURE

Q
R

or UVLO

(TEA1506AT)

PROTECTION

ON-TIME

MAXIMUM

PROTECTION

Fig.2 Block diagram.

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2003 Sep 09 4

prot(CTRL)

I

3

1

(2)

CC

V

2

(3)

GND

(6)

CTRL

TEA1506P;

(TEA1506T;

TEA1506AP

TEA1506 AT)

Pin numbers in parenthesis represent the SO version.

Philips Semiconductors Product specification

GreenChipII SMPS control IC

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

PINNING

SYMBOL

V

CC

GND 2 3 ground
CTRL 3 6 control input
DEM 4 7 input from auxiliary winding for demagnetization timing; overvoltage and

I

sense

DRIVER 6 11 gate driver output
HVS 7 12, 13 high voltage safety spacer; not connected
DRAIN 8 14 drain of external MOS switch; input for valley sensing and initial internal

n.c. − 1, 4, 5, 8,10not connected

PIN

DESCRIPTION

DIP8 SO14

1 2 supply voltage

overpower protection

5 9 programmable current sense input

supply

handbook, halfpage

V

CC

GND

CTRL

DEM

1
2

TEA1506P

TEA1506AP

3
4

MDB506

8
7
6
5

DRAIN
HVS
DRIVER
I

sense

Fig.3 Pin configuration DIP8.

handbook, halfpage

n.c.

V

CC

GND

n.c.
n.c.

CTRL

DEM

1
2
3
4

TEA1506AT

5
6
7

TEA1506T

MDB507

14
13
12
11
10

9
8

DRAIN
HVS
HVS
DRIVER
n.c.
I

sense

n.c.

Fig.4 Pin configuration SO14.

2003 Sep 09 5

Philips Semiconductors Product specification

GreenChipII SMPS control IC

FUNCTIONAL DESCRIPTION

The TEA1506 is the controller of a compact flyback
converter, and is situated at the primary side. An auxiliary
winding of the transformer provides demagnetization
detection and powers the IC after start-up.

The TEA1506 can operate in multi modes (see Fig.5).

handbook, halfpage

(kHz)

f

VCO fixed quasi resonant

175

25

Fig.5 Multi modes operation.

MGU508

P (W)

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

V

handbook, halfpage

sense(max)

0.52 V

Fig.6 V

sense(max)

1 V

(typ)

1.5 V
(typ)

voltage as function of V

The moment the voltage on pin VCC drops below the
undervoltage lock-out level, the IC stops switching and
re-enters the safe restart mode.

Supply management

MGU233

V

CTRL

CTRL

.

The next converter stroke is started only after
demagnetization of the transformer current (zero current
switching), while the drain voltage has reached the lowest
voltage to prevent switching losses (green function). The
primary resonant circuit of the primary inductance and
draincapacitorensuresthis quasi-resonant operation. The
design can be optimized in such a way that zero voltage
switching can be reached over almostthe universal mains
range.

To prevent very high frequency operation at lower loads,
the quasi-resonant operation changes smoothly in fixed
frequency PWM control.

At very low power (standby) levels, the frequency is
controlled down, via the VCO, to a minimum frequency of
approximately 25 kHz.

Start-up and undervoltage lock-out

Initially the IC is in the save restart mode. As long as V
is below the V

level, the supply current is nearly

CC(start)

CC

zero.
TheIC will activate theconverteras soon as the voltageon

pin VCC passes the V

CC(start)

level.

The IC supply is taken over by the auxiliary winding as
soon as the output voltage reaches its intended level.

All (internal) reference voltages are derived from a
temperature compensated, on-chip band gap circuit.

Current mode control

Current mode control is used for its good line regulation
behaviour.

The ‘on-time’ iscontrolled by theinternally inverted control
voltage, which is compared with the primary current
information. The primary current is sensed across an
external resistor. The driver output is latched in the logic,
preventing multiple switch-on.

The internal control voltage is inverselyproportional to the
external control pin voltage, with an offset of 1.5 V. This
means that a voltage range from 1 to 1.5 V on pin CTRL
will result in an internal control voltage range from

0.5 to 0 V (a high external control voltage results in a low
duty cycle).

Oscillator

The maximum fixed frequency of the oscillator isset by an
internal current source and capacitor. The maximum
frequency is reduced once the control voltage enters the
VCO control window. Then, the maximum frequency
changeslinearly with thecontrol voltage untilthe minimum
frequency is reached (see Figs 6 and 7).

2003 Sep 09 6

Philips Semiconductors Product specification

GreenChipII SMPS control IC

handbook, halfpage

f

(kHz)

175

25

VCO

VCO

2

level

level

Fig.7 VCO frequency as function of V

handbook, full pagewidth

1

MGU509

175 kHz

V

sense(max) (V)

sense(max)

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

Cycle skipping

At very low power levels, a cycle skipping mode will be
activated. A high control voltage will reduce the switching
frequency to a minimum of 25 kHz. If the voltage on the
control pin is raised even more, switch-on of the external
power MOSFET will be inhibited until the voltage on the
control pin has dropped to a lower value again (see Fig.8).

For system accuracy, it is not the absolute voltage on the
control pin that will trigger the cycle skipping mode, but a
signal derived from the internal VCO will be used.

Remark: If the no-load requirement of the system is such

.

that the output voltage can be regulated to its intended
level at a switching frequency of 25 kHz or above, the
cycle skipping mode will not be activated.

f

osc

1.5 V − V

CTRL

CTRL

X2

V

x

150 mV

The voltage levels dV1 and dV2 are fixed in the IC to 50 mV (typical) and 18 mV (typical) respectively.

current

comparator

V

I

DRIVER

OSCILLATOR

DRIVER

I

sense

f

max

f

min

cycle

skipping

1

0

Fig.8 The cycle skipping circuitry.

dV

2

dV

1

150

Vx (mV)

MGU510

Vx (mV)

2003 Sep 09 7