參數(shù)資料
型號(hào)： TDA8939
廠商： NXP Semiconductors N.V.
英文描述： Zero dead time Class-D 7.5 A power comparator
中文描述： 零死時(shí)間D類7.5甲功率比較
文件頁(yè)數(shù)： 7/21頁(yè)
文件大?。?/td> 99K
代理商： TDA8939
9397 750 13023
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 — 22 April 2004
7 of 21
Philips Semiconductors
TDA8939
Zero dead time Class-D 7.5 A power comparator
8.3.2
Outputs
8.3.3
Reference voltages
8.4 Start-up timing
Power comparator mode selection:
Standby mode: when pin POWERUP is LOW, the power comparator is in standby
mode, independent of the signal on the enable input
Reset mode: when pin POWERUP is HIGH, the status of the power comparator is
controlled by pin ENABLE; if pin ENABLE is LOW, the status of the power stage is
reset and the outputs are floating
Operating mode: when pin ENABLE is HIGH, the power stage is in operating mode.
To ensure correct start-up of the power stage, the enable input should never be HIGH
when the power-up input is LOW. Before switching to operating mode, the amplifier should
first be switched to reset mode.
Remark:
It is possible to directly connect the power-up input to the positive supply line
(e.g. V
DDA1
). As soon as the supply voltage is applied the device will be DC-biased (reset
mode).
Table 5:
Pin name
DIAGN
Outputs
Pin number
7
Description
Digital open-drain output; referenced to CGND; output indicates
the following fault conditions: OTP, OCP, OVP and UVP. In the
event of a fault condition the output is pulled to the CGND voltage
(active LOW). If the diagnostic output functionality is used in the
application, an external pull-up resistor is required.
Table 6:
Pin name
CGND
Reference voltages
Pin number
8
Description
common ground; reference ground for diagnostic
output, enable input and power-up input
negative digital supply; reference ground digital circuits.
The V
SSD
pin should be connected to V
SS
voltage in the
application. Internally the V
SSD
pin is connected to the
V
SSAx
and V
SSPx
(e.g. V
SSA1
and V
SSP1
) via an ESD
protection diode.
V
SSD
24
Table 7:
Pin
POWERUP
LOW
HIGH
HIGH
Mode selection
Mode
ENABLE
X
LOW
HIGH
standby
reset
operating
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