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.

TEA1506P

TEA1506AP

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

DEM

(7)

OVER-

VOLTAGE

DRAIN

(14)

prot(DEM)

clamp

DRIVER

(11)

DRIVER

PROTECTION

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

sense

(9)

0.5 V

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

UP/DOWN

COUNTER

CONTROL

FREQUENCY

LOGIC

RESET

POWER-ON

−1

3.8 V

Q R

UVLO

< 4.5 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)

(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

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

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

DESCRIPTION

DIP8 SO14

1 2 supply voltage

overpower protection

5 9 programmable current sense input

supply

handbook, halfpage

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.

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)

VCO fixed quasi resonant

175

Fig.5 Multi modes operation.

MGU508

P (W)

TEA1506P; TEA1506AP;

TEA1506T; TEA1506AT

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

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)

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

(kHz)

175

VCO

level

Fig.7 VCO frequency as function of V

handbook, full pagewidth

MGU509

175 kHz

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.

osc

1.5 V − V

CTRL

150 mV

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

current

comparator

DRIVER

OSCILLATOR

DRIVER

sense

max

min

cycle

skipping

Fig.8 The cycle skipping circuitry.

150

Vx (mV)

MGU510

Vx (mV)

2003 Sep 09 7

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