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PDF 3935 Data sheet ( Hoja de datos )
| Número de pieza | 3935 | |
| Descripción | 3-PHASE POWER MOSFET CONTROLLER | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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3935
3-PHASE POWER MOSFET CONTROLLER
— For Automotive Applications
Package ED, 44-Pin PLCC
Package JP, 48-Pin LQFP
Package LQ, 36-Pin SOIC
ABSOLUTE MAXIMUM RATINGS
Load Supply Voltages, VBAT, VDRAIN,
VBOOST, BOOSTD ... -0.6 V to 40 V
Output Voltage Ranges,
GHA/GHB/GHC, VGHX .. -4 V to 55 V
SA/SB/SC, VSX ............... -4 V to 40 V
GLA/GLB/GLC, VGLX .... -4 V to 16 V
CA/CB/CC, VCX .......... -0.6 V to 55 V
Sense Circuit Voltages,
CSP,CSN, LSS ............... -4 V to 6.5 V
Logic Supply Voltage,
VDD ........................... -0.3 V to +6.5 V
Logic Input/Outputs and OVSET, BOOSTS,
CSOUT, VDSTH ......... -0.3 V to 6.5 V
Operating Temperature Range,
TA ........................... -40°C to +135°C
Junction Temperature, TJ ........... +150°C
Storage Temperature Range,
TS ........................... -55°C to +150°C
* Fault conditions that produce excessive
junction temperature will activate device
thermal shutdown circuitry. These conditions
can be tolerated, but should be avoided.
The A3935 is designed specifically for automotive applications that
require high-power motors. Each provides six high-current gate drive
outputs capable of driving a wide range of n-channel power MOSFETs.
A requirement of automotive systems is steady operation over a
varying battery input range. The A3935 integrates a pulse-frequency
modulated boost converter to create a constant supply voltage for
driving the external MOSFETs. Bootstrap capacitors are utilized to
provide the above battery supply voltage required for n-channel FETs.
Direct control of each gate output is possible via six TTL-compat-
ible inputs. A differential amplifier is integrated to allow accurate
measurement of the current in the three-phase bridge.
Diagnostic outputs can be continuously monitored to protect the
driver from short-to-battery, short-to-supply, bridge-open, and battery
under/overvoltage conditions. Additional protection features include
dead-time, VDD undervoltage, and thermal shutdown.
The A3935 is supplied in a choice of three packages, a 44-lead
PLCC with copper batwing tabs (suffix ED), a 48-lead low profile QFP
with exposed thermal pad (suffix JP), and a 36-lead 0.8 mm pitch SOIC
(suffix LQ).
FEATURES
! Drives wide range of n-channel MOSFETs in 3-phase bridges
! PFM boost converter for use with low-voltage battery supplies
! Internal LDO regulator for gate-driver supply
! Bootstrap circuits for high-side gate drivers
! Current monitor output
! Adjustable battery overvoltage detection.
! Diagnostic outputs
! Motor lead short-to-battery, short-to-ground, and
bridge-open protection
! Undervoltage protection
! -40 °C to +150 °C, TJ operation
! Thermal shutdown
Always order by complete part number, e.g., A3935KLQ .
1 page  
3935
THREE-PHASE POWER
MOSFET CONTROLLER
ELECTRICAL CHARACTERISTICS: unless otherwise noted at TJ = -40°C to +150°C, VBAT = 7 V to 16 V,
VDD = 4.75 V to 5.25 V, ENABLE = 22.5 kHz, 50% Duty Cycle, Two Phases Active.
Characteristics
Symbol Conditions
Control Logic
Logic Input Voltages
VI(1) Minimum high level input for logical “one”
VI(0) Maximum low level input for logical “zero”
Logic Input Currents
II(1) VI = VDD
II(0) VI = 0.8 V
Input Hysteresis
Vhys
Logic Output High Voltage
VO(H)
IO(H) = -800 uA
Logic Output Low Voltage
VI(L) IO(L) = 1.6 mA
Gate Drives, GHx ( internal SOURCE or upper switch stages)
Output High Voltage
VDSL(H) GHx: IxU = -10 mA, Vsx = 0
GLx: IxU = -10 mA, Vlss = 0
Source Current (pulsed)
IxU VSDU = 10 V, TJ = 25 °C
VSDU = 10 V, TJ = 135 °C
Source ON Resistance
rSDU(on) IxU = -150 mA, Tj = 25 °C
IxU = -150 mA, TJ = 135 °C
Gate Drives, GLx ( internal SINK or lower switch stages)
Sink Current (pulsed)
IxL
Sink ON Resistance
rDSL(on)
Gate Drives, GHx, GLx (General)
VDSL = 10 V, TJ = 25 °C
VDSL = 10 V, TJ = 135 °C
IxL = +150 mA, TJ = 25 °C
IxL = +150 mA, TJ = 135 °C
Propagation Delay, Logic only
Output Skew Time
Dead Time
(Shoot-Through Prevention)
tpd Logic input to unloaded GHx, GLx
tsk(o) Grouped by edge, phase-to-phase
tdead Between GHx, GLx transitions of same phase
Limits
Min Typ Max
2.0
–
–
50
100
VDD-0.8
–
–
–
–
–
–
–
–
–
0.8
500
–
300
–
0.4
VREG-2.26 –
VREG-0.26 –
– 800
400 –
4.0 –
7.0 –
VREG
VREG
–
–
10
15
– 850
550 –
1.8 –
3.0 –
–
–
6.0
7.5
– – 150
– – 50
75 – 180
Units
V
V
µA
µA
mV
V
V
V
V
mA
mA
Ω
Ω
mA
mA
Ω
Ω
ns
ns
ns
NOTES: Typical Data and Typical Characteristics are for design information only.
Negative current is defined as coming out of (sourcing) the specified device terminal.
For GHX: VSDU = VCX – VGHX, VDSL = VGHX – VSX, VDSL(H) = VCX – VSDU – VSX.
For GLX: VSDU = VREG – VGLX, VDSL = VGLX – VLSS, VDSL(H) = VREG – VSDU – VLSS.
www.allegromicro.com
5
5 Page 
3935
THREE-PHASE POWER
MOSFET CONTROLLER
Functional Description (cont’d)
Input Logic
ENABLE xLO xHI GLx GHx Mode of Operation
0 X X 0 0 All gate drive outputs low
1 0 0 0 0 Both gate drive outputs low
1 0 1 0 1 High side on
1 1 0 1 0 Low side on
1 1 1 0 0 XOR circuitry prevents shoot-through
Fault Mode
No Fault
Short-to-Battery
Short-to-Ground
Bridge (VDRAIN) Fault
VREG Undervoltage
VBAT Overvoltage
VBAT Undervoltage'
VDD Undervoltage'
Thermal Shutdown'
ENABLE
Input
X
1#
1$
1%
X
X
X
X
X
Fault Responses
FAULT OVFLT UVFLT
100
000
000
000
000
010
001
0 ZZ
0 ZZ
Boost
Reg.
ON
ON
ON
ON
ON
OFF&
OFF
OFF
OFF
VREG
Reg.
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
GHx
"
"
"
"
"
"
0
0
0
GLx
"
"
"
"
"
"
0
0
0
NOTES: x = “Little x ”indicates A, B, or C phase.
X = “Capital X “ indicates a “don’t care”.
Z = High-impedance state.
" = Depends on xLO input, xHI input, and ENABLE. See Input Logic table.
# = Short-to-battery can only be detected when the corresponding GLx = 1. This fault is not detected when ENABLE = 0.
$ = Short-to-ground can only be detected when the corresponding GHx = 1. This fault is not detected when ENABLE = 0.
% = Bridge fault appears as a short-to-ground fault on all motor phases. This fault is not detected when ENABLE = 0.
& = Off, only because VBOOST ≈ VBAT is above the voltage threshold of the regulator’s voltage control loop.
' = These faults are not only reported but action is taken by the internal logic to protect the A3935 and the system.
www.allegromicro.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet 3935.PDF ] | |
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