參數(shù)資料
型號(hào)： L9524C-TR
廠商： STMICROELECTRONICS
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO24
封裝： LEAD FREE, SOP-24
文件頁(yè)數(shù)： 11/27頁(yè)
文件大小： 410K
代理商： L9524C-TR
L9524C
Functional description
19/27
4.9
Relay output
In relay mode (modes 1 and 2) the IO pin is used as output pin to control an external relay
driver (e.g. a low-side switch which drives the relay). If the output stage of the IO pin is
switched on it behaves like a voltage source (VIO) with output resistance RIO. If it is switched
off a pull-down current source is activated (IIO). The relay output suppresses pulses shorter
than tIO sup such that the relay can be permanently switched by applying appropriate PWM
signals to the CI pin (see section “Control input”).
In transistor mode (modes 3 to 6) the IO pin is used as input pin. Left open it is pulled down
to ground and the power regulation feature (see section “Power regulation”) is activated
(VIO <VIO pr). To deactivate the power regulation feature the IO pin must be connected to
the CUR pin (VIO = VCUR > VIO pr).
4.10
Gate charge/discharge current variation
The CUR pin provides a constant current-limited output voltage VCUR. The gate charge (or
discharge) current is a multiple of the current flowing out of the CUR pin and can therefore
be varied by applying a resistor to the CUR pin.
In order to select the mode of operation the IO pin and/or the MS pin may be connected to
the CUR pin (see section “Modes”). The IO pin contains a pull-down current source and the
MS pin contains a pull-up current source. These currents are compensated if the
corresponding pin is connected to the CUR pin in order not to affect the gate
charge/discharge current.
4.11
Overcurrent threshold variation
The overcurrent threshold
ΔV
OC can be varied by connecting the OCT pin to an external
resistive voltage divider between CUR pin and ground. If the OCT pin is left open it is pulled
up to an internal supply voltage by a current source and a default value is used for the
overcurrent threshold. This default value corresponds to the condition: VOCT = VCUR/6. In
order not to de tune the voltage divider the pull-up current IOCT source is deactivated when
any glow plug is switched on.
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