A4900
High Voltage Three Phase Gate Driver
Functional Description
The A4900 provides six gate drives, capable of driving a wide
range of N-channel IGBT or power MOSFET switches. The
GHA, GHB, GHC High-side, gate drive outputs for external
N-channel MOSFETs or IGBTs.
gate drives are configured as three high-voltage high-side drives
and three low-side drives. The high-side drives are isolated up
to 600 V to allow operation with high bridge (motor) supply
voltages. High-side drives use a bootstrap capacitor to provide
the necessary gate drive voltage above the motor supply voltage.
Each drive can be controlled with a TTL logic level input com-
patible with 3.3 V or 5 V logic systems.
SA, SB, SC Motor phase connections that are the negative supply
connections for the floating high-side drivers and returns for the
high-side gate discharge current to the sources of the high-side
switches. They also are connected to the negative side of the
bootstrap capacitors and provide the reference offset voltage for
the high-side VDS monitors.
DLA, DLB, DLC Low-side drain voltage sense input to the low-
side VDS monitors. Typically connected to the drain via a resistor
potential divider.
A single supply input provides the gate drive supply and the
bootstrap capacitor charge source. An internal regulator from the
single supply provides the lower internal voltage for the logic
circuit. The A4900 provides internal monitors to ensure that
the gate-source voltage of both high-side and low-side external
MOSFETs or IGBTs are above 9 V when active.
GLA, GLB, GLC Low-side gate drive outputs for external
N-channel MOSFETs or IGBTs.
AHI, ALO Logic inputs for phase A gate drive control.
BHI, BLO Logic inputs for phase B gate drive control.
CHI, CLO Logic inputs for phase C gate drive control.
The control inputs to the A4900 provide a very flexible solution
for many motor control applications. Each driver can be driven
with an independent PWM signal allowing implementation of
all motor excitation methods including trapezoidal and sinusoi-
dal drive.
COASTn Active-low logic input that forces all gate drive outputs
low, and turns all external power switches off. Overrides all gate
drive control inputs.
Diagnostics include short detection for the power switching
devices, undervoltage detection for the key internal and external
supplies and overtemperature detection. Two fault flags indicate
three sets of faults and specific faults can be determined by read-
ing a serial register.
RESETn Active low logic input that resets faults when pulsed
low. Allows low-power shutdown (sleep mode) when held low
for more than the RESETn Shutdown Time, tRSD
.
FF1, FF2 Open drain fault flag outputs that indicate the presence
of fault conditions. FF2 can be used as a clock input to read a
serial register on FF1.
Specific functions are described more fully in the following sec-
tions.
ESF Enable stop-on-fail logic input that determines actions to be
taken during overtemperature fault conditions.
Terminal Functions
VCC Power supply for internal regulators and gate drive circuits.
This supply also provides the charging source for the external
bootstrap diodes. It should be decoupled with ceramic capacitors
connected close to the VCC and GND terminals.
Power Supply
All internal supplies and references are derived from a single
power supply connection to VCC at 15 V (typ). A single ground
connection provides the return path for the operating current and
the low-side gate discharge currents. The ground terminal must
have a low impedance, low inductance path to the system ground
of the main power bridge. The VCC supply must be decoupled
with ceramic capacitors connected close to the supply and ground
terminals. The supply for the internal logic is provided by an inte-
grated linear regulator which provides the internal logic supply
GND Power, digital, and reference ground. Low-side return path
for discharge of the capacitance on the MOSFET or IGBT gates.
DHA, DHB, DHC High-side drain voltage sense input to the high-
side VDS monitors. Typically connected to the drain via a resistor
potential divider.
BCA, BCB, BCC High-side connections for the bootstrap capaci-
tors and positive supply for high-side gate drivers.
voltage, VDD.
Allegro MicroSystems, LLC
115 Northeast Cutoff
10
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5秒后页面跳转
LM317T数据手册解读：产品特性、应用、封装与引脚详解
一文带你了解?DB3二极管好坏判断、参数信息、替代推荐
LM358DR数据手册：引脚说明、电气参数及替换型号推荐
OP07CP数据手册解读：引脚信息、电子参数
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
