TEA1210TS Просмотр технического описания (PDF) - Philips Electronics

Номер в каталоге

Компоненты Описание

производитель

TEA1210TS

High efficiency, high current DC/DC converter

Philips Electronics 

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 V

V1 + 0.3 V

V1 + 0.3 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 kΩ and R2 = 93.1 kΩ (see Fig.5).

4. The current limit is defined by the external current limiting resistors, see Section “Current limiting resistors”.

Rlimx = 996 Ω results in a typical current limit of 400 mA and Rlimx = 178 Ω 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 Ω and an inductor having an

inductance of 6.8 µH, an ESR of 0.04 Ω, 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

Share Link: