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PDF TEA1530AT Data sheet ( Hoja de datos )

Número de pieza TEA1530AT
Descripción SMPS Control IC
Fabricantes Philips 
Logotipo Philips Logotipo



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TEA1530AT
GreenChipII SMPS control IC
Rev. 01 — 18 May 2005
Objective data sheet
1. General description
The GreenChip™II is the second generation of green Switched Mode Power Supply
(SMPS) controller ICs. Its high level of integration allows the design of a cost effective
power supply with a very low number of external components.
The TEA1530AT can be used in Fixed Frequency converter designs for low voltage, high
current applications. At low power (standby) levels, the system operates in cycle skipping
mode which minimizes the switching losses during standby.
The proprietary high voltage BCD800 process makes direct start-up possible from the
rectified universal mains voltage in an effective and green way. A second low voltage
BICMOS IC is used for accurate, high speed protection functions and control.
The TEA1530AT enables highly efficient and reliable supplies to be designed easily.
2. Features
2.1 Distinctive features
s Universal mains supply operation (70 V to 276 V AC)
s High level of integration, resulting in a very low external component count
s Fixed frequency operation
2.2 Green features
s Cycle skipping mode at very low loads; input power < 300 mW at no-load operation for
a typical adapter application
s On-chip start-up current source.
2.3 Protection features
s Safe restart mode for system fault conditions
s Undervoltage protection (foldback during overload)
s IC OverTemperature Protection (OTP) (latched)
s Low and adjustable OverCurrent Protection (OCP) trip level
s Soft (re)start
s Mains voltage-dependent operation-enabling level
s General purpose input for latched or safe restart protection and timing, e.g. to be used
for overvoltage protection (OVP), output short-circuit protection or system OTP.

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Philips Semiconductors
TEA1530AT
GreenChipII SMPS control IC
7.1 Start-up, mains enabling operation level and undervoltage lock out
Refer to Figure 8 and Figure 9. Initially, the IC is self supplying from the rectified mains
voltage via pin DRAIN. Supply capacitor CVCC (at pin 1) 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 Vm (mains-dependent operation-enabling level), the start-up
current source will continue charging capacitor CVCC (switch S1 will be opened); see
Figure 1. The IC will activate the power converter as soon as the voltage on pin VCC
passes the Vstart level. At this moment the IC supply from the high voltage pin is stopped
(green function). The IC supply is taken over by the auxiliary winding of the flyback
converter.
The moment the voltage on pin VCC drops below VUVLO (undervoltage lock out), the IC
stops switching and performs a safe restart from the rectified mains voltage. In the safe
restart mode the driver output is disabled and pin VCC voltage is recharged via pin DRAIN.
7.2 Supply management
All (internal) reference voltages are derived from a temperature compensated, on-chip
band gap circuit.
7.3 Current control mode
Current control mode is used for its good line regulation behavior.
The primary current is sensed across an external resistor and compared with the internal
control voltage. The driver output is latched in the logic, preventing multiple switch-on.
The internal control voltage is inversely proportional to the external pin CTRL voltage, with
an offset of 1.5 V. This means that a voltage range from 1 V to approximately 1.5 V on
pin CTRL will result in an internal control voltage range from 0.5 V to 0 V (a high external
control voltage results in a low duty cycle).
Vsense(max) (V)
coa016
0.52 V
Cycle
skip
active
25 mV
1V
(typ)
1.5 V
(typ) VCTRL (V)
Fig 5. The Vsense(max) voltage as a function of VCTRL
7.4 Oscillator
The fixed frequency of the oscillator is set by an internal current source and capacitor.
Objective data sheet
Rev. 01 — 18 May 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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Philips Semiconductors
TEA1530AT
GreenChipII SMPS control IC
Table 5: Characteristics …continued
Tamb = 25 °C; VCC = 15 V; all voltages are measured with respect to ground (pin 2); currents are positive when flowing into
the IC; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
Ioper supply current under normal no load on pin DRIVER
operation
1.1 1.3 1.5 mA
Pulse width modulator
ton(min)
ton(max)
δmax
Oscillator
minimum on-time
maximum on-time
maximum duty-cycle
- tleb - ns
20 25 30 µs
67 70 73 %
fosc
oscillator frequency (fixed
VCTRL < 1 V
frequency)
50 63 75 kHz
Duty cycle control (pin CTRL)
Vmin minimum voltage for maximum
duty cycle
- 1.0 - V
Vmax
maximum voltage for minimum
duty cycle
- 1.5 - V
Islopecomp/t
slope compensation current
VCTRL(detect)
Control detect level
Protection and timing input (pin PROTECT)
1.2 1
0.8 µA/µs
0.56 0.63 0.70 V
Vtrip
Vtrip(latch)
VCC(latch)(reset)
trip level
trip level for latch
voltage level on pin VCC which VCC(latch) < 2.3 V
resets the latch
[1] 2.37
2.85
-
2.5
3
4.5
2.63 V
3.15 V
-V
Icharge
charge current
VCTRL < 0.63 V
Idischarge
discharge current
Overcurrent and winding short-circuit protection (pin SENSE)
57 50 43 µA
- 100 - nA
Vsense(max)
maximum source voltage for V/t = 0.1 V/µs
OCP
0.48 0.52 0.56 V
tPD
propagation delay from
V/t = 0.5 V/µs
detecting Vsense(max) to
switch-off
- 140 185 ns
tleb blanking time for current and
winding short-circuit protection
330 400 470 ns
Iss soft start current
Driver (pin DRIVER)
Vsense < 0.5 V
45 60 75 µA
Isource
Isink
Vo(max)
source current
sink current
maximum output voltage
VCC = 9.5 V; VDRIVER = 2 V
VCC = 9.5 V
VDRIVER = 2 V
VDRIVER = 9.5 V
VCC > 12 V
- 150 88 mA
- 250 -
300 500 -
- 11.5 12
mA
mA
V
Objective data sheet
Rev. 01 — 18 May 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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