AMIS-39101 Datasheet, PDF (8/12 Pages) AMI SEMICONDUCTOR – Octal High-Side Driver with Protection

AMIS−39101
Load Specific Parameters
High side driver parameters for specific loads are specified in following categories:
1. Parameters for inductive loads up to 350 mH and T_ambient up to 85°C
2. Parameters for inductive loads up to 300 mH and T_ambient up to 85°C
3. Parameters for resistive loads and T_ambient up to 85°C
Table 8. LOAD SPECIFIC CHARACTERISTICS
Symbol
Description
Min.
Max. Unit
I_OUT_ON_max.
A. Inductive Load up to 350 mH and T_ambiant up to 855C
Maximum output per HS driver, all eight drivers might be active simultaneously
240
mA
I_OUT_ON_max.
B. Inductive Load up to 300 mH and T_ambiant up to 855C
Maximum output per HS driver, all eight drivers might be active simultaneously
275
mA
I_OUT_ON_max.
C. Resistive Load and T_ambiant up to 855C
Maximum output per HS driver, all eight drivers might be active simultaneously
350
mA
Maximum output per one HS driver, only one can be active
650
mA
Maximum output per HS driver,
only two HS drivers from a different pair can be active simultaneously
500
mA
Maximum output per one HS driver pair
830
mA
NOTE: The parameters above are not tested in production but are guaranteed by design. The overall current capability limitations need to
be respected at all times.
The maximum current specified in Table 8 cannot always
be obtained. The practically obtainable maximum drive
current heavily depends on the thermal design of the
application PCB (see Thermal Characteristics section).
The available power in the package is: (TSD_H −
T_ambient) / Rthja
With TSD_H = 130°C and Rthja according to Table 5.
Charge Pump
The high side drivers use floating NDMOS transistors as
power devices. To provide the gate voltages for the NDMOS
of the high side drivers, a charge pump is integrated. The
storage capacitor is an external one. The charge pump
oscillator has typical frequency of 4 MHz.
DIAGNOSTICS
result in the diagnostic register which is then latched in the
output register at the rising edge of the WR−pin. Each driver
has its corresponding diagnostic bit DIAG_x. By comparing
the actual output status (DIAG_x) with the requested driver
status (CMD_x) you can diagnose the correct operation of
the application according to Table 9.
Thermal Shutdown (TSD) Diagnostic
In case of TSD activation, all bits DIAG1 to DIAG8 in the
serial interface output register are set into the fault state and
all drivers will be switched off (see Table 9).
The TSD error condition is active until it is reset by the
next correct communication on serial interface (i.e. number
of clock pulses during WR = 0 is divisible by 8), provided
that the device has cooled down under the TSD trip point.
Short Circuit Diagnostics
The diagnostic circuit in the AMIS−39101 monitors the
actual output status at the pins of the device and stores the
Table 9. OUT DIAGNOSTICS
Requested Driver Status
CMD_x
On
1
On
1
Off
0
Actual Output Status
High
Low
High
DIAG_x
1
0
1
Diagnosis
Normal state
Short to ground or TSD (Note 11)
Short to VS or missing load (Note 10)
or TSD (Note 11)
Off
0
Low
0
Normal state (Note 10)
10. The correct diagnostic information is available after T_diagnostic_OFF time.
11. All 8 diagnostic bits DIAG_x must be in the fault condition to conclude a TSD diagnostic.
Ground Loss
Due to its design, the AMIS−39101 is protected for withstanding module ground loss and driver output shorted to ground
at the same time.
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