Philips TEA1506P, TEA1506AP, TEA1506T, TEA1506AT Technical data

TEA1506

INTEGRATED CIRCUITS

DATA SHEET

TEA1506P; TEA1506AP; TEA1506T; TEA1506AT

GreenChipäII SMPS control IC

Product specification			2003 Sep 09

	Philips Semiconductors	Product specification
	GreenChipäII SMPS control IC	TEA1506P; TEA1506AP;
		TEA1506T; TEA1506AT

FEATURES

Distinctive features

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

·High level of integration; giving a low external component count.

Green features

APPLICATIONS

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

·Valley or zero voltage switching for minimum switching losses

·Efficient quasi-resonant operation at high power levels

·Frequency reduction at low power standby for improved system efficiency (£3 W)

·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)

·Accurate and 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.

	1	8
	2 TEA1506P 7
	TEA1506AP	6
	3
	4	5
		MDB504
Fig.1	Basic application diagram.

2003 Sep 09

2

	Philips Semiconductors	Product specification
	GreenChipäII SMPS control IC	TEA1506P; TEA1506AP;
		TEA1506T; TEA1506AT

GENERAL DESCRIPTION

The GreenChipä(1)II is the second generation of green 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.

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 GreenChipäII control IC.

ORDERING INFORMATION

	TYPE NUMBER		PACKAGE
		NAME	DESCRIPTION	VERSION
	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

2003 Sep 09

3

09 Sep 2003

4

_

full,

1

pagewidth

8

VCC

SUPPLY

DRAIN

(2)

MANAGEMENT

(14)

Iprot(DEM)

internal UVLO start

VALLEY

clamp

GND

2

supply

4

(3)

VOLTAGE

DEM

CONTROLLED

LOGIC

(7)

OSCILLATOR

100

mV

OVER-

FREQUENCY

UP/DOWN

VOLTAGE

CONTROL

COUNTER

PROTECTION

6

Iprot(CTRL)

LOGIC

DRIVER

DRIVER

(11)

CTRL

3

−1

Iss

POWER-ON

(6)

LEB

3.8 V

RESET

S

Q

soft

0.5 V

blank

start

S2

UVLO

R

Q

5

Isense

S

Q

OCP

(9)

OVER-

VCC < 4.5 V

TEMPERATURE

R

Q

PROTECTION

or UVLO

TEA1506P;

(TEA1506AT)

short

TEA1506AP

MAXIMUM

0.88 V

(TEA1506T;

winding

ON-TIME

TEA1506 AT)

PROTECTION

OVERPOWER

PROTECTION

MDB505

Pin numbers in parenthesis represent the SO version.

Fig.2 Block diagram.

DIAGRAM BLOCK	äGreenChip
	IC control SMPS II

TEA1506AT TEA1506T;

TEA1506AP; TEA1506P;

Semiconductors Philips

specification Product

Philips Semiconductors Product specification

	GreenChipäII SMPS control IC					TEA1506P; TEA1506AP;
						TEA1506T; TEA1506AT
	PINNING
	SYMBOL		PIN			DESCRIPTION
		DIP8		SO14
	VCC	1		2	supply voltage
	GND	2		3	ground
	CTRL	3		6	control input
	DEM	4		7	input from auxiliary winding for demagnetization timing; overvoltage and
					overpower protection
	Isense	5		9	programmable current sense input
	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
					supply
	n.c.	−		1, 4, 5, 8,	not connected
				10

				handbook, halfpage
				n.c.	1			14	DRAIN
handbook, halfpage				VCC	2			13	HVS
VCC	1		8	DRAIN
				GND	3			12	HVS
GND	2	TEA1506P	7	HVS			TEA1506T
		TEA1506AP		n.c.	4			11	DRIVER
CTRL	3		6	DRIVER			TEA1506AT
				n.c.	5			10	n.c.
DEM	4		5	Isense
				CTRL	6			9	Isense
		MDB506
				DEM	7			8	n.c.
							MDB507

Fig.3 Pin configuration DIP8.

Fig.4 Pin configuration SO14.

2003 Sep 09

5

	Philips Semiconductors	Product specification
	GreenChipäII SMPS control IC	TEA1506P; TEA1506AP;
		TEA1506T; TEA1506AT

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).

f		MGU508
handbook, halfpage(kHz)
VCO	fixed	quasi resonant
175

25

P (W)

Fig.5 Multi modes operation.

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 drain capacitor ensures this quasi-resonant operation. The design can be optimized in such a way that zero voltage switching can be reached over almost the 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 VCC

is below the VCC(start) level, the supply current is nearly zero.

The IC will activate the converter as soon as the voltage on pin VCC passes the VCC(start) level.

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

MGU233

Vsense(max) handbook, halfpage

0.52 V

1 V	1.5 V		VCTRL
(typ)	(typ)

Fig.6 Vsense(max) voltage as function of VCTRL.

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

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’ is controlled by the internally 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 inversely proportional 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 is set 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 changes linearly with the control voltage until the minimum frequency is reached (see Figs 6 and 7).

2003 Sep 09

6

	Philips Semiconductors	Product specification
	GreenChipäII SMPS control IC	TEA1506P; TEA1506AP;
		TEA1506T; TEA1506AT

MGU509

f

handbook, halfpage

(kHz)

175 kHz

175

25

VCO2	VCO1 Vsense(max) (V)
level	level

Fig.7 VCO frequency as function of Vsense(max).

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.

			fosc
1.5 V − VCTRL	current		fmax
	comparator
CTRL		DRIVER	DRIVER
			fmin
X2			Isense
			dV2	dV1	Vx (mV)
Vx
			cycle		150
	V		skipping
		OSCILLATOR
	I
150 mV			1
			0
					Vx (mV)
					MGU510

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

Fig.8 The cycle skipping circuitry.

2003 Sep 09

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