參數(shù)資料
型號: IR2214
廠商: International Rectifier
英文描述: HALF-BRIDGE GATE DRIVER IC
中文描述: 半橋柵極驅(qū)動IC
文件頁數(shù): 14/28頁
文件大小: 308K
代理商: IR2214
14
IR2214/IR22141(SS)
www.irf.com
ADVANCE DATA
FEATURES DESCRIPTION
1. Start-up sequence
At power supply start-up it is recommended to
keep FLT_CLR pin active until supply voltages
are properly established. This prevents spurious
diagnostic signals being generated. All protection
functions are operating independently from
FLT_CLR status and output driver status reflects
the input commands.
When bootstrap supply topology is used for
supplying the floating high side stage, the
following start-up sequence is recommended
(see also figure 12):
1.
2.
3.
Set Vcc
Set FLT_CLR pin to HIGH level
Set LIN pin to HIGH level and let the
bootstrap capacitor be charged
Release LIN pin to LOW level
Release FLT_CLR pin to LOW level
4.
5.
Figure 12
Start-up sequence
A minimum 15
μ
s LIN and FLT-CLR pulse is
required.
VCC
FLT_CLR
LIN
LO
2. Normal operation mode
After start-up sequence has been terminated, the
device becomes fully operative (see grey blocks
in the State Diagram).
HIN and LIN produce driver outputs to switch
accordingly, while the input logic checks the input
signals preventing shoot-through events and
including DeadTime (DT).
3. Shut down
The system controller can asynchronously
command the Hard ShutDown (HSD) through the
3.3 V compatible CMOS I/O FAULT/SD pin. This
event is not latched.
In a multi-phase system, FAULT/SD signals are
or-wired so the controller or one of the gate drivers
can force simultaneous shutdown to the other
gate drivers through the same pin.
4. Fault management
IR2214 is able to manage both the supply failure
(undervoltage lock out on both low and high side
circuits) and the desaturation of both power
transistors.
4.1 Undervoltage (UV)
The Undervoltage protection function disables the
driver’s output stage preventing the power device
being driven with too low voltages.
Both the low side (V
supplied) and the floating
side (V
supplied) are controlled by a dedicate
undervoltage function.
Undervoltage event on the V
(when
V
< UV
) generates a diagnostic signal by
forcing FAULT/SD pin low (see FAULT/SD section
and figure 14). This event disables both low side
and floating drivers and the diagnostic signal holds
until the under voltage condition is over. Fault
condition is not latched and the FAULT/SD pin is
released once V
CC
becomes higher than UV
VCC+
.
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