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PDF TEA1210 Data sheet ( Hoja de datos )

Número de pieza TEA1210
Descripción High efficiency/ high current DC/DC converter
Fabricantes NXP Semiconductors 
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INTEGRATED CIRCUITS
DATA SHEET
TEA1210TS
High efficiency, high current DC/DC
converter
Preliminary specification
File under Integrated Circuits, IC03
1999 Mar 08

1 page




TEA1210 pdf
Philips Semiconductors
High efficiency, high current DC/DC converter
Preliminary specification
TEA1210TS
PINNING
SYMBOL
PIN
DESCRIPTION
UPOUT
1, 16
output voltage in up mode;
input voltage in down mode
SYNC
2 synchronization clock input
SHDWN
3 shut-down input
LX 4, 5, 12, 13 inductor connection
U/D 6 up-or-down mode selection
input; active LOW for up mode
ILIMH
7 current limiting resistor 1
connection
GND
8, 9 ground
ILIML
10 current limiting resistor 2
connection
ILIMSEL
11 current limiting selection input
PWM
14 PWM-only mode selection
input
FB 15 feedback input
handbook, halfpage
UPOUT 1
16 UPOUT
SYNC 2
15 FB
SHDWN 3
14 PWM
LX 4
13 LX
TEA1210TS
LX 5
12 LX
U/D 6
11 ILIMSEL
ILIMH 7
10 ILIML
GND 8
9 GND
MGR726
Fig.2 Pin configuration.
For all possible applications, the following groups of pins
must be connected together:
Pins 4, 5, 12 and 13 (pins LX)
Pins 1 and 16 (pins UPOUT)
Pins 8 and 9 (pins GND).
FUNCTIONAL DESCRIPTION
Control mechanism
The TEA1210TS DC/DC converter is able to operate in
PFM (discontinuous conduction) or PWM (continuous
conduction) operating mode. All switching actions are
completely determined by a digital control circuit which
uses the output voltage level as its control input. This novel
digital approach enables the use of a new pulse width and
frequency modulation scheme, which ensures optimum
power efficiency over the complete operating range of the
converter.
When high output power is requested, the device will
operate in PWM (continuous conduction) operating mode.
This results in minimum AC currents in the circuit
components and hence optimum efficiency, cost and
EMC. In this operating mode, the output voltage is allowed
to vary between two predefined voltage levels. As long as
the output voltage stays within this so-called window,
switching continues in a fixed pattern. When the output
voltage reaches one of the window borders, the digital
controller immediately reacts by adjusting the pulse width
and inserting a current step in such a way that the output
voltage stays within the window with higher or lower
current capability. This approach enables very fast
reaction to load variations. Figure 3 shows the converter’s
response to a sudden load increase. The upper trace
shows the output voltage. The ripple on top of the DC level
is a result of the current in the output capacitor, which
changes in sign twice per cycle, times the capacitor’s
internal Equivalent Series Resistance (ESR). After each
ramp-down of the inductor current, i.e. when the ESR
effect increases the output voltage, the converter
determines what to do in the next cycle. As soon as more
load current is taken from the output the output voltage
starts to decay.
When the output voltage becomes lower than the low limit
of the window, a corrective action is taken by a ramp-up of
the inductor current during a much longer time. As a result,
the DC current level is increased and normal PWM control
can continue. The output voltage (including ESR effect) is
again within the predefined window.
Figure 4 depicts the spread of the output voltage window.
The absolute value is most dependent on spread, while the
actual window size is not affected. For one specific device,
the output voltage will not vary more than 2% typically.
In low output power situations, the TEA1210TS will switch
over to PFM (discontinuous conduction) operating mode in
case the PWM-only mode is not active.
1999 Mar 08
5

5 Page





TEA1210 arduino
Philips Semiconductors
High efficiency, high current DC/DC converter
Preliminary specification
TEA1210TS
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP. MAX. UNIT
Digital levels
VlL LOW-level input voltage
on pins SHDWN, ILIMSEL, U/D
and SYNC
0 0.4 V
VIH HIGH-level input voltage
on pins U/D and PWM
on pins SYNC and SHDWN
on pin ILIMSEL
note 8
note 8
notes 8 and 9
V1 0.4
0.55V1
0.55V1
V1 + 0.3
V1 + 0.3
V1 + 0.3
V
V
V
Notes
1. The undervoltage lockout voltage shows wide specification limits since it decreases at increasing temperature.
When the temperature increases, the minimum supply voltage of the digital control part of the IC decreases and
therefore the correct operation of this function is guaranteed over the whole temperature range.
2. When VI is lower than the target output voltage but higher than 2.9 V, the P-type power MOSFET will remain
conducting (100% duty cycle), resulting in VO following VI.
3. The quiescent current is specified as the input current in the upconversion configuration at VI = 2.40 V and
VO = 3.60 V, using L1 = 6.8 µH, R1 = 178 kand R2 = 93.1 k(see Fig.5).
4. The current limit is defined by the external current limiting resistors, see Section “Current limiting resistors”.
Rlimx = 996 results in a typical current limit of 400 mA and Rlimx = 178 results in a typical current limit of 2.0 A.
The spread of the current limit decreases with increasing the Ilim setpoint.
5. The specified efficiency is valid when using an output capacitor having an ESR of 0.04 and an inductor having an
inductance of 6.8 µH, an ESR of 0.04 , and a sufficient saturation current level. The current limit is assumed to be
set at 4.0 A. In the PWM-only mode, the efficiency at IL = 1 mA and IL = 4 mA is lower than the values specified.
6. The specified efficiency at IL = 1.5 A is only valid if the average input current does not exceed the maximum
value of ILX. In most practical applications, this means that the load current is not continuous.
7. The specified start-up time is the time between the connection of a 2.40 V input voltage source and the moment the
output reaches 3.60 V. The output capacitance equals 2000 µF, the inductance equals 6.8 µH, no load is present.
8. V1 is the voltage on the pins UPOUT. If the applied HIGH-level voltage is less than V1 1 V, the quiescent current
of the device will increase.
9. Maximum additional supply current on the pins UPOUT is 50 µA in case the voltage V1 = 5.0 V and the input voltage
on pin ILIMSEL is 2.2 V.
1999 Mar 08
11

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