2000 Dec 05
2
Philips Semiconductors
Preliminary specification
GreenChip
TM
II SMPS control IC
TEA1507
FEATURES
Distinctive features
Universal mains supply operation (70 to 276 V AC)
High level of integration, giving a very low external
component count.
Green features
Valley/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)
Burst mode operation for very low standby levels (<1 W)
On-chip start-up current source.
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
Short winding protection
Undervoltage protection (foldback during overload)
Overtemperature protection
Low and adjustable overcurrent protection trip level
Soft (re)start
Mains voltage-dependent operation-enabling level.
APPLICATIONS
Besides typical application areas, i.e. TV and Monitor
supplies, the device can be used in all applications that
demand an efficient and cost-effective solution up to
250 W.
handbook, halfpage
MGU229
TEA1507
1
2
3
4
8
7
6
5
Fig.1 Typical application.
2000 Dec 05
3
Philips Semiconductors
Preliminary specification
GreenChip
TM
II SMPS control IC
TEA1507
GENERAL DESCRIPTION
The GreenChip
TM
II is the second generation of green
Switched Mode Power Supply (SMPS) controller ICs
operating directly from the rectified universal mains. A high
level of integration leads to a cost effective power supply
with a very low number of external components.
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 reduced frequency and with valley detection.
If burst mode operation is applied, the standby power level
can even be reduced to below 1 W.
The proprietary high voltage BCD800 process makes
direct start-up possible from the rectified mains voltage in
an effective and green way. A second low voltage
BICMOS IC is used for accurate, high speed protection
functions and control.
Highly efficient, reliable supplies can easily be designed
using the GreenChip
TM
II controller.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TEA1507P
DIP8
plastic dual in-line package; 8 leads (300 mil)
SOT97-1
2000 Dec 05
5
Philips Semiconductors
Preliminary specification
GreenChip
TM
II SMPS control IC
TEA1507
PINNING
SYMBOL PIN
DESCRIPTION
V
CC
1
supply voltage
GND
2
ground
CTRL
3
control input
DEM
4
input from auxiliary winding for
demagnetization timing, OVP and OPP
I
sense
5
programmable current sense input
DRIVER
6
gate driver output
HVS
7
high voltage safety spacer, not
connected
DRAIN
8
drain of external MOS switch, input for
start-up current and valley sensing
handbook, halfpage
MGU231
TEA1507
1
2
3
4
VCC
GND
CTRL
DEM
DRAIN
HVS
DRIVER
Isense
8
7
6
5
Fig.3 Pin configuration.
FUNCTIONAL DESCRIPTION
The TEA1507 is the controller of a compact flyback
converter, with the IC situated at the primary side. An
auxiliary winding of the transformer provides
demagnetization detection and powers the IC after
start-up.
The TEA1507 operates in multi modes.
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 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
about 6 kHz. Typically, 3 Watts can be achieved for a
75 W converter with an output power of 100 mW.
Start-up, mains enabling operation level and
undervoltage lock out (see Figs. 10 and 11)
Initially, the IC is self supplying from the rectified mains
voltage via pin DRAIN. Supply capacitor C
VCC
is charged
by the internal start-up current source to a level of about
4 V or higher, depending on the drain voltage. Once the
drain voltage exceeds the M-level (mains-dependent
operation-enabling level), the start-up current source will
continue charging capacitor C
VCC
(switch S1 will be
opened), see Fig.2. The IC will activate the power
converter as soon as the voltage on pin V
CC
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 and the IC supply from the mains voltage is
subsequently stopped for high efficiency operation (green
function).
The moment the voltage on pin V
CC
drops below the
V
UVLO
(undervoltage lock out) level, the IC stops switching
and enters a safe restart from the rectified mains voltage.
Inhibiting the auxiliary supply by external means causes
the converter to operate in a stable, well-defined burst
mode.
Supply management
All (internal) reference voltages are derived from a
temperature compensated, on-chip band gap circuit.
handbook, halfpage
VCO
fixed
quasi resonant
power
MGU232
f
6 kHz
175 kHz
Fig.4 Multi mode operation.
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