TI TPIC46L02DB

TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
D
D
D
D
D
D
D
D
D
D
D
D
D
D
6-Channel Serial-in/Parallel-in Low-side
Pre-FET Driver
Device Can Be Cascaded
Internal 55-V Inductive Load Clamp and
VGS Protection Clamp for External Power
FETs
Independent Shorted-Load/Short-to-Battery
Fault Detection on All Drain Terminals
Independent Off-State Open-Load Fault
Sense
Over-Battery-Voltage Lockout Protection
and Fault Reporting
Under-Battery-Voltage Lockout Protection
for TPIC46L01 and TPIC46L02
Asynchronous Open-Drain Fault Flag
Device Output Can be Wire-ORed with
Multiple External Devices
Fault Status Returned Through Serial
Output Terminal
Internal Global Power-on Reset of Device
High-Impedance CMOS Compatible Inputs
With Hysteresis
TPIC46L01 and TPIC46L03 Disables the
Gate Output When a Shorted-Load Fault
Occurs
TPIC46L02 Transitions the Gate Output to a
Low-Duty-Cycle PWM Mode When a
Shorted-Load Fault Occurs
DB PACKAGE
(TOP VIEW)
FLT
VCOMPEN
VCOMP
IN0
IN1
IN2
IN3
IN4
IN5
CS
SDO
SDI
SCLK
VCC
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
VBAT
GATE0
DRAIN0
GATE1
DRAIN1
DRAIN2
GATE2
GATE3
DRAIN3
DRAIN4
GATE4
DRAIN5
GATE5
GND
description
The TPIC46L01, TPIC46L02, and TPIC46L03 are low-side predrivers that provide serial input interface and
parallel input interface to control six external field-effect transistor(FET) power switches such as offered in the
TI TPIC family of power arrays. These devices are designed primarily for low-frequency switching, inductive
load applications such as solenoids and relays. Fault status for each channel is available in a serial-data format.
Each driver channel has independent off-state open-load detection and on-state shorted-load/short-to-battery
detection. Battery overvoltage and undervoltage detection and shutdown are provided. Battery and output load
faults provide real-time fault reporting to the controller. Each channel also provides inductive-voltage-transient
protection for the external FET.
These devices provide control of output channels through a serial input interface or a parallel input interface.
A command to enable the output from either interface enables the respective channel GATE output to the
external FET. The serial input interface is recommended when the number of signals between the control device
and the predriver must be minimized, and the speed of operation is not critical. In applications where the
predriver must respond very quickly or asynchronously, the parallel input interface is recommended.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright  1997, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
For serial operation, the control device must transition CS from high to low to activate the serial input interface.
When this occurs, SDO is enabled, fault data is latched into the serial input interface, and the FLT flag is
refreshed.
Data is clocked into the serial registers on low-to-high transitions of SCLK through SDI. Each string of data must
consist of 8 bits of data. In applications where multiple devices are cascaded together, the string of data must
consist of 8 bits for each device. A high data bit turns the respective output channel on and a low data bit turns
it off. Fault data for the device is clocked out of SDO as serial input data is clocked into the device. Fault data
consists of fault flags for the over-battery voltage (bit 8), under-battery voltage (bit 7) (not on TPIC46L03) and
shorted/open-load flags (bits 1-6) for each of the six output channels. A logic-high bit in the fault data indicates
a fault and a logic-low bit indicates that no fault is present on that channel. Fault register bits are set or cleared
asynchronously to reflect the current state of the hardware. The fault must be present when CS is transitioned
from high to low to be captured and reported in the serial fault data. New faults cannot be captured in the serial
register when CS is low. CS must be transitioned high after all of the serial data has been clocked into the device.
A low-to-high transition of CS transfers the last six bits of serial data to the output buffer, puts SDO in a
high-impedance state, and clears and re-enables the fault register. The TPIC46L01/L02/L03 was designed to
allow the serial input interfaces of multiple devices to be cascaded together to simplify the serial interface to the
controller. Serial input data flows through the device and is transferred out SDO following the fault data in
cascaded configurations.
For parallel operation, data is asynchronously transferred directly from the parallel input interface (IN0-IN5) to
the respective GATE output. SCLK or CS are not required for parallel control. A 1 on the parallel input turns the
respective channel on, where a 0 turns it off. Note that either the serial interface or the parallel interface can
enable a channel. Under parallel operation, fault data must still be collected through the serial data interface.
The predrivers monitor the drain voltage for each channel to detect shorted-load or open-load fault conditions
in the on and off states respectively. These devices offer the option of using an internally generated
fault-reference voltage or an externally supplied VCOMP for fault detection. The internal fault reference is
selected by connecting VCOMPEN to GND and the external reference is selected by connecting VCOMPEN
to VCC. The drain voltage is compared to the fault-reference voltage when the channel is turned on to detect
shorted-load conditions and when the channel is off to detect open-load conditions. When a shorted-load fault
occurs using the TPIC46L01 or TPIC46L03, the channel is turned off and a fault signal is sent to FLT as well
as to the serial fault-register bit. When a shorted-load fault occurs while using the TPIC46L02, the channel
transitions into a low-duty-cycle, pulse-width-modulated (PWM) signal as long as the fault is present.
Shorted-load conditions must be present for at least the shorted-load deglitch time, t(STBDG), in order to be
flagged as a fault. A fault signal is sent to FLT as well as the serial fault register bit. More detail on fault detection
operation is presented in the device operation section of this data sheet.
The TPIC46L01 and TPIC46L02 provide protection from over-battery voltage and under-battery voltage
conditions irrespective of the state of the output channels. The TPIC46L03 provides protection from over-battery
voltage conditions irrespective of the state of the output channels When the battery voltage is greater than the
overvoltage threshold or less than the undervoltage threshold (except for the TPIC46L03, which has no
undervoltage threshold), all channels are disabled and a fault signal is sent to FLT as well as to the respective
fault register bits. The outputs return to normal operation once the battery voltage fault has been corrected.
When an over-battery/under-battery voltage condition occurs, the device reports the battery fault, but disables
fault reporting for open and shorted-load conditions. Fault reporting for open and shorted-load conditions are
re-enabled after the battery fault condition has been corrected.
These devices provide inductive transient protection on all channels. The drain voltage is clamped to protect
the FET. This clamp voltage is defined by the sum of VC and turn-on voltage of the external FET. The predriver
also provides a gate-to-source voltage (VGS) clamp to protect the GATE-source terminals of the power FET from
exceeding their rated voltages.
These devices provide pulldown resistors on all inputs except CS. A pullup resistor is used on CS.
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
schematic diagram
8
Fault Logic
SDI
SCLK
UVLO†
OVLO
SDO
Serial Register
VCC
Parallel Register
CS
8
FLT
IN 0
IN 1
IN 2
IN 3
IN 4
IN 5
PREZ
GND
D
Q
DRAIN 0
DRAIN 1
DRAIN 2
DRAIN 3
DRAIN 4
DRAIN 5
8
6
STB and Open-Load Fault
Protection
VCOMPEN
OSC
S
BIAS
2
B
VCOMP
A
Gate
Drive Block
VBAT
OVLO
UVLO†
Vbg
GATE 0
GATE 1
GATE 2
GATE 3
GATE 4
GATE 5
† UVLO is not in TPIC46L03
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
Terminal Functions
TERMINAL
NAME
NO.
I/O
DESCRIPTION
CS
10
I
Chip select. A high to low transition on the CS enables SDO, latches fault data into the serial interface, and
refreshes the fault flag. When CS is high, the fault registers can change fault status. On the falling edge of CS, fault
data is latched into the serial output register and transferred using SDO and SCLK. On a low to high transition of
CS, serial data is latched in to the output control register.
DRAIN0
DRAIN1
DRAIN2
DRAIN3
DRAIN4
DRAIN5
26
24
23
20
19
17
I
FET drain inputs. DRAIN0 through DRAIN5 are used for both open-load and short-circuit fault detection at the drain
of the external FETs. They are also used for inductive transient protection.
FLT
1
O
Fault flag. FLT is an open-drain output that provides a real-time fault flag for shorted-load/open-load/over-battery
voltage/under-battery voltage faults. The device can be ORed with FLT on other devices for interrupt handling. FLT
requires an external pullup resistor.
GATE0
GATE1
GATE2
GATE3
GATE4
GATE5
27
25
22
21
18
16
O
Gate drive output. GATE0 through GATE5 outputs are derived from the VBAT supply. Internal clamps prevent the
voltages on these nodes from exceeding the VGS rating on most FETs.
GND
15
I
Ground and substrate
IN0
IN1
IN2
IN3
IN4
IN5
4
5
6
7
8
9
I
Parallel gate driver inputs. IN0 through IN5 are real-time controls for the gate predrive circuitry. They are CMOS
compatible with hysteresis.
SCLK
13
I
Serial clock. SCLK clocks the shift register. Serial data is clocked into SDI and serial fault data is clocked out of
SDO on the falling edge of the serial clock.
SDI
12
I
Serial data input. Output control data is clocked into the serial register through SDI. A 1 on SDI commands a
particular gate output on and a 0 turns it off.
SDO
11
O
Serial data output. SDO is a 3-state output that transfers fault data to the controling device. It also passes serial
input data to the next stage for cascaded operation. SDO is taken to a high-impedance state when CS is in a high
state.
VBAT
VCC
28
I
Battery supply voltage input
14
I
Logic supply voltage
VCOMPEN
2
I
Fault reference voltage select. VCOMPEN selects the internally generated fault reference voltage (0) or an
external fault reference (1) to be used in the shorted- and open-load fault detection circuitry.
VCOMP
3
I
Fault reference voltage. VCOMP provides an external fault reference voltage for the shorted- and open-load fault
detection circuitry.
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 7 V
Battery supply voltage range, VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 60 V
Input voltage range,VI (at any input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 7 V
Output voltage range, VO (SDO and FLT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 7 V
Drain-to-source input voltage, VDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 60 V
Output voltage, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.3 V to 15 V
Operating case temperature range, TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40°C to + 125°C
Thermal resistance, junction to ambient, RθJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112°C/W
Operating virtual junction temperature range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 40°C to + 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to GND.
recommended operating conditions
Logic supply voltage, VCC
Battery supply voltage, VBAT
MIN
NOM
MAX
4.5
5.0
5.5
V
24
V
8
High-level input voltage, VIH
0.85 VCC
Low-level input voltage, VIL
0
Setup time, SDI high before SCLK rising edge, tsu (see Figure 5)
10
Hold time, SDI high after SCLK rising edge, th (see Figure 5)
10
Case temperature, TC
–40
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
VCC
0.15 VCC
UNIT
V
V
ns
ns
125
°C
5
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
IBAT
ICC
TEST CONDITIONS
Supply current, VBAT
All outputs off,
Supply current, VCC
All outputs off,
V(turnon)
Turn-on voltage, logic operational, VCC
VBAT = 5.5 V,
Check output functionality
V(ovsd)
Vhys(ov)
Over-battery-voltage shutdown
V(uvsd)
Over-battery-voltage reset hysteresis
Under-battery-voltage shutdown,
(TPIC46L01, L02 only)
VBAT = 12 V
VBAT = 5.5 V
Gate disabled,
disabled
See Figure 16
disabled
Gate disabled,
See Figure 17
MIN
TYP
MAX
UNIT
300
500
700
µA
1
2.6
4.2
mA
2.6
3.5
4.4
V
32
34
36
V
0.5
1
1.5
V
4.1
4.8
5.4
V
100
200
300
mV
7
13.5
V
5
7
V
Vhys(uv)
Under-battery-voltage reset hysteresis,
(TPIC46L01, L02 only)
VG
Gate drive voltage
IO(H)
Maximum current output for drive terminals,
pullup
VOUT = GND
0.5
1.2
2.5
mA
IO(L)
Maximum current output for drive terminals,
pulldown
VOUT = 7 V
0.5
1.2
2.5
mA
V(stb)
Short-to-battery/shorted-load/open-load
detection voltage
VCOMPEN = L
1.1
1.25
1.4
V
Vhys(stb)
Short-to-battery hysteresis
40
100
150
mV
VD(open)
Open-load off-state detection drain voltage
threshold
1.1
1.25
1.4
V
8 V < VBAT < 24,
5.5 V < VBAT < 8 V,
IO = 100 µA
IO = 100 µA
VCOMPEN = L
Vhys(open)
II(open)
Open-load hysteresis
40
100
150
mV
Open-load off-state detection current
30
60
80
µA
II(PU)
II(PD)
Input pullup current (CS)
Input pulldown current
VCC = 5 V,
VCC = 5 V,
VI(hys)
Input voltage hysteresis
VCC = 5 V
0.6
VO(SH)
VO(SL)
High-level serial output voltage
IO = 1 mA
IO = 1 mA
0.8 VCC
IOZ(SD)
VO(CFLT)
3-state current serial-data output
Fault-interrupt output voltage
VCC = 0 to 5.5 V
IO = 1 mA
VI(COMP)
VC
Fault-external reference voltage
VCOMPEN = H
Output clamp voltage, (TPIC46L01, L02 only)
dc < 1%,
VC
Output clamp voltage, (TPIC46L03 only)
dc < 1%,
6
Low-level serial output voltage
POST OFFICE BOX 655303
VIN = 0
VIN = 5 V
-10
10
µA
10
µA
0.85
• DALLAS, TEXAS 75265
47
47
V
V
0.1
0.4
V
1
10
µA
0.1
0.5
V
3
V
55
63
V
60
V
1
tw = 100 µs
tw = 100 µs
1.1
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
switching characteristics, VCC = 5 V, VBAT = 12 V, TC = 25°C
PARAMETER
TEST CONDITIONS
t(STBFM)
Mask time, short-to-battery/shorted-load/openload fault
See Figures 14 and 15
t(STBDG)
Deglitch time, short-to-battery/shorted-load
See Figure 14
tPLH
Propagation turn-on delay time, CS or IN0-IN5
to GATE0-GATE5
C(gate) = 400 pF,
tPHL
Propagation turn-off delay time, CS or IN0-IN5
to GATE0-GATE5
tr1
MIN
TYP
MAX
UNIT
60
µs
8
µs
See Figure 1
4
µs
C(gate) = 400 pF,
See Figure 2
3.5
µs
Rise time, GATE0–GATE5
C(gate) = 400 pF,
See Figure 3
3.5
µs
tf1
Fall time, GATE0–GATE5
C(gate) = 400 pF,
See Figure 4
3
f(SCLK)
trf(SB)
Serial clock frequency
Refresh time, short-to-battery
TPIC46L02 only,
See Figure 14
10
ms
tw
Short-to-battery refresh pulse width
TPIC46L02 only,
See Figure 14
68
µs
td1
Setup time, CS↓ to ↑SCLK
See Figure 5
10
ns
tpd1
Propagation delay time, CS↓ to SDI valid
RL = 10 kΩ,
See Figure 6
40
ns
tpd2
Propagation delay time, SCLK↓ to SDI valid
See Figure 6
20
ns
tpd3
Propagation delay time, CS↑ to SDO 3-state
RL = 10 kΩ,
See Figure 7
CL = 50 pF,
2
µs
tr2
Rise time, SDO 3-state to SDO valid
RL = 10 kΩ to GND,
CL = 200 pF,
Over-battery fault,
See Figure 8
30
ns
tf2
Fall time, SDO 3-state to SDO valid
RL = 10 kΩ to VCC,
CL = 200 pF,
No faults,
See Figure 9
20
ns
tr3
Rise time, FLT
RL = 10 kΩ,
See Figure 10
CL = 50 pF,
1.2
µs
tf3
Fall time, FLT
RL = 10 kΩ,
See Figure 11
CL = 50 pF,
15
ns
CL = 200 pF,
IN0 – IN5
CS or IN0 –IN 5
µs
10
50%
CS
MHz
50%
50%
tPLH
tPHL
90%
GATE0 – GATE5
GATE0–GATE5
Figure 1
10%
Figure 2
tf1
tr1
90%
GATE0–GATE5
GATE0–GATE5
90%
10%
10%
Figure 4
Figure 3
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• DALLAS, TEXAS 75265
7
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
SCLK
SCLK
td1
CS
CS
th
tpd1
tsu
3-STATE
SDI
SDI
tpd2
Figure 5
Figure 6
50%
CS
SDO
tpd3
90%
3-STATE
10%
3-STATE
SDO
tr2
Figure 8
Figure 7
tr3
tf2
SDO
3-STATE
FLT
90%
10%
Figure 10
Figure 9
tf3
FLT
90%
10%
Figure 11
8
90%
10%
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TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
serial data operation
The TPIC46L01, TPIC46L02, and TPIC46L03 offer serial input interfaces to the microcontroller to transfer
control data to the predriver and output fault data back to the controller. The serial input interface consists of:
•
•
•
•
SCLK – Serial clock
CS
– Chip select
SDI
– Serial data input
SDO
– Serial data output
Serial data is shifted into the least significant bit (LSB) of the SDI shift register on the rising edge of the first SCLK
after CS has transitioned from 1 to 0. Eight clock cycles are required to shift the first bit from the LSB to the most
significant bit (MSB) of the shift register. Less than eight clock cycles result in fault data being latched into the
output control buffer. The first two bits are unused and the last six bits are the output control data. A low-to-high
transition on CS latches the contents of the serial shift register into the output control register. A 0 input to SDI
turns the corresponding parallel output off and a 1 turns the output on (see Figure 12).
1
2
3
4
5
6
7
8
SCLK
CS
SDI
New Data
Output Control
Register Data
Don’t Care
GATE5
GATE4
GATE3
GATE2
GATE1
GATE0
OFF
ON
ON
OFF
OFF
ON
Present Output Data
New Data
Figure 12
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• DALLAS, TEXAS 75265
9
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
serial data operation (continued)
Data is shifted out of SDO on the falling edge of SCLK. The MSB of fault data is available when CS is transitioned
low. The remaining 7 bits of fault data are shifted out on the following seven clock cycles. Fault data is latched
into the serial register when CS is transitioned low. Fault data must be present on the high-to-low transition of
CS to be captured by the device. The CS input must be transitioned to a high state after the last bit of serial data
has been clocked into the device. CS puts SDO in a high-impedance state, inhibits SDI, latches the 6 bits of
serial data into the output control register, and clears and re-enables the serial fault registers (see Figure 13).
When a shorted-load condition occurs with the TPIC46L01 or TPIC46L03, the controller must disable and
re-enable the channel to clear the fault register and fault flag. The TPIC46L02 automatically retries the output
and FLT clears after the fault condition has been corrected.
1
2
3
4
5
6
7
8
SCLK
CS
SDO
3-State
OV
UV
FLT5
FLT4
FLT3
FLT2
FLT1
FLT0
bit8
bit7
bit6
bit5
bit4
bit3
bit2
bit1
OV
UV
FLT5
FLT4
FLT3
FLT2
FLT1
FLT0
N/A
N/A
Over-Battery-Voltage Fault Bit
Under-Battery-Voltage Fault Bit
Shorted- or Open-Load Fault on Channel 5
Shorted- or Open-Load Fault on Channel 4
Shorted- or Open-Load Fault on Channel 3
Shorted- or Open-Load Fault on Channel 2
Shorted- or Open-Load Fault on Channel 1
Shorted- or Open-Load Fault on Channel 0
Unknown Data
Figure 13
parallel input data operation
In addition to the serial input interface, the TPIC46L01 and TPIC46L02 also provides a parallel input interface
to the microcontroller. The output turns on if either the parallel or the serial interface commands it to turn on.
The parallel data pins are real-time control inputs for the output drivers. SCLK and CS are not required to transfer
parallel input data to the output buffer. Fault data must be read over the serial data bus as described in the serial
data operation section of this data sheet. The parallel input must be transitioned low and then high to clear and
re-enable a gate output that has been disabled due to a shorted-load fault condition.
10
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
chipset performance under fault conditions
The TPIC46L01, TPIC46L02, TPIC46L03, and power FET array’s are designed for normal operation over a
battery-voltage range of 8 V to 24 V with load fault detection from 4.8 V to 34 V. The TPIC46L01, TPIC46L02,
and TPIC46L03 offer on-board fault detection to handle a variety of faults that may occur within a system. The
circuits primary function is to prevent damage to the load and the power FETs in the event that a fault occurs.
Unused DRAIN0–DRAIN5 inputs must be connected to VBAT through a pullup resistor to prevent false reporting
of open-load fault conditions. This circuitry detects the fault, shuts off the output to the FET, and reports the fault
to the microcontroller. The primary faults under consideration are:
1.
2.
3.
4.
Shorted-load
Open-load
Over-battery voltage shutdown
Under-battery voltage shutdown
NOTE:
On the TPIC46L01 and TPIC46L02, an undervoltage fault may be detected when VCC and VBAT are
applied to the device. The controller should initialize the fault register after power up to clear any
false fault reports.
shorted–load fault condition
The TPIC46L01 and TPIC46L02 monitor the drain voltage of each channel to detect shorted-load conditions.
The on-board deglitch timer starts running when the gate output to the power FET transitions from the off state
to the on state. The timer provides a 60-µs deglitch time, t(STBFM), to allow the drain voltage to stabilize after
the power FET has been turned on. The deglitch time is only enabled for the first 60 µs after the FET has been
turned on. After the deglitch delay time, the drain voltage is checked to verify that it is less than the fault reference
voltage. When it is greater than the reference voltage for at least the short-to-battery deglitch time, t(STBDG), then
FLT flags the microcontroller that a fault condition exists and the gate output is automatically shut off
(TPIC46L01 and TPIC46L03) until the error condition has been corrected.
An overheating condition on the FET occurs when the controller continually tries to re-enable the output under
shorted-load fault conditions. When a shorted-load fault is detected while using the TPIC46L02, the gate output
is transitioned into a low-duty-cycle PWM signal to protect the FET from overheating. The PWM rate is defined
as t(SB) and the pulse with is defined as tw. It remains in this low-duty-cycle pulse state until the fault has been
corrected or until the controller disables the gate output.
The microcontroller can read the serial port on the predriver to isolate which channel reported the fault condition.
Fault bits 0–5 distinguish faults for each of the output channels. When a shorted-load condition occurs with the
TPIC46L01, the controller must disable and re-enable the channel to clear the fault register and fault flag. The
TPIC46L02 automatically retries the output and the fault clears after the fault condition has been corrected.
Figure 14 illustrates operation after a gate output has been turned on. The gate to the power FET is turned on
and the deglitch timer starts running. Under normal operation T1 turns on and the drain operates below the
reference point set at U1. The output of U1 is low and a fault condition is not flagged.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
11
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
External
TPIC46L01/L02
VBAT
Load
T1
+
_
1.25 V
Input From
TPIC46L01/L02
N-Channel
U1
FLT
Deglitch
SHORTED-LOAD TPIC46L01 AND TPIC46L03
NORMAL
Input
Input
GATE0–
GATE5
GATE0–
GATE5
Glitches
Glitches
DRAIN0–
DRAIN5
DRAIN0–
DRAIN5
t(STBFM)
FLT
FLT
t(STBDG)
t(STBFM)
SHORTED-LOAD TPIC46L02
Input
GATE0–
GATE5
Glitches
t(SB)
tw
DRAIN0–
DRAIN5
GATE0–
GATE5
FLT
t(STBDG)
t(STBFM)
Figure 14
12
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
open load
The TPIC46L01, TPIC46L02, and TPIC46L03 monitor the drain of each power FET for open-circuit conditions
that may exist. The 60-µA current source is provided to monitor open-load fault conditions. Open-load faults are
detected when the power FET is turned off. When load impedance is open or substantially high, then the 60-µA
current source has adequate drive to pull the drain of T1 below the fault reference threshold on the detection
circuit. Unused DRAIN0–DRAIN5 inputs must be connected to VBAT through a pullup resistor to prevent false
reporting of open-load fault conditions. The on-board deglitch timer starts running when the TPIC46L01,
TPIC46L02, and TPIC46L03 gate output to the power FET transitions to the off state. The timer provides a 60-µs
deglitch time, t(STBFM), to allow the drain voltage to stabilize after the power FET has been turned off. The
deglitch time is only enabled for the first 60 µs after the FET has been turned off. After the deglitch delay time,
the drain is checked to verify that it is greater than the fault reference voltage. When it is less than the reference
voltage, a fault is flagged to the microcontroller through FLT that an open-load fault condition exists. The
microcontroller can then read the serial port on the TPIC46L01, TPIC46L02, and TPIC46L03 to isolate which
channel reported the fault condition. Fault bits 0–5 distinguish faults for each of the output channels. Figure 15
illustrates the operation of the open-load detection circuit. This feature provides useful information to the
microcontroller to isolate system failures and warn the operator that a problem exists. Examples of such
applications would be warning that a light bulb filament may be open, solenoid coils may be open, etc.
External
TPIC46L01/L02/L03
VBAT
Load
U1
60 µA
T1
Input From
TPIC46L01/L02/L03
1.25 V
N-Channel
GATE0–
GATE5
OPEN-LOAD
Input
NORMAL
Glitches
DRAIN0–
DRAIN5
FLT
FLT
Deglitch
NORMAL
Input
+
_
GATE0–
GATE5
DRAIN0–
DRAIN5
FLT
t(STBFM)
t(STBFM)
Figure 15
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
13
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
over-battery-voltage shutdown
The TPIC46L01, TPIC46L02, and TPIC46L03 monitor the battery voltage to prevent the power FETs from being
turned on in the event that the battery voltage is too high. This condition may occur due to voltage transients
resulting from a loose battery connection. The TPIC46L01/L02/L03 turns the power FETs off when the battery
voltage is above 34 volts, to prevent possible damage to the load and the FETs. The gate output goes back to
normal operation after the overvoltage condition has been corrected. An over-battery-voltage fault is flagged
to the controller through the fault flag. Bit 8 of the serial-data fault word is set whenever an over-battery voltage
condition is present. When an overvoltage condition occurs the device reports the battery fault, but disables fault
reporting for open and shorted-load conditions. Fault reporting for open and shorted-load conditions re-enables
after the battery-fault condition has been corrected. When the fault condition is removed before the CS signal
transitions low, then the fault condition is not captured in the serial fault register. FLT resets on the high-to-low
transition of CS provided no other faults are present in the device. Figure 16 illustrates the operation of the
over-battery voltage-detection circuit.
VBAT
34 V
VBAT
+
_
Output Disable
34 V
12 V
33 V
GATE0 – GATE5
Figure 16
14
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
under-battery-voltage shutdown (TPIC46L01, and TPIC46L02 only)
The TPIC46L01 and TPIC46L02 monitor the battery voltage to prevent the power FETs from being turned on
in the event that the battery voltage is too low. When the battery voltage is below 4.8 volts, then GATE0–GATE5
outputs may not provide sufficient gate voltage to the power FETs to minimize the on-resistance that could result
in a thermal stress on the FET. The output resumes normal operation after the under-voltage condition has been
corrected. An under-battery voltage fault flags the controller through the fault flag. Bit 7 of the serial-data fault
word is set whenever an under-battery voltage condition is present. When an under-battery voltage condition
occurs the device reports the battery fault, but disables fault reporting for open- and shorted-load conditions.
When the fault condition is removed before CS signal transitions low, the fault condition is not captured in the
serial fault register. FLT resets on the high-to-low transition of CS provided no other faults are present in the
device. Figure 17 illustrates the operation of the under-battery voltage-detection circuit.
VBAT
_
4.8 V
U1
Output Disable
+
12 V
VBAT
5V
4.8 V
GATE0–GATE5
Figure 17
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
15
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
Inductive voltage transients
A typical application for the predriver/power FET circuit is to switch inductive loads. When an inductive load is
switched off, a large voltage spike can occur. These spikes can exceed the maximum VDS rating for the external
FET and damage the device when proper protection is not in place. The FET can be protected from these
transients through a variety of methods using external components. The TPIC46L01 and TPIC46L02 offer that
protection in the form of a zener diode stack connected between the drain input and GATE output (see Figure
18). Zener diode (Z1) turns the FET on to dissipate the transient energy. GATE diode (Z2) is provided to prevent
the gate voltage from exceeding 13 volts during normal operation and transient protection.
TPIC46L01/02
External
DRAIN
Z1
LOAD
55 V
GATE
Z2
Power FET
13 V
Figure 18
16
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
VBAT
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
PRINCIPLES OF OPERATION
external fault reference input
The TPIC46L01, TPIC46L02, and TPIC46L03 compare each channel drain voltage to a fault reference to detect
shorted-load and open-load conditions. The user has the option of using the internally generated 1.25-V fault
reference or providing an external reference voltage through VCOMP. The internal reference voltage is selected
by connecting VCOMPEN to GND and VCOMP is selected by connecting VCOMPEN to VCC (see Figure 19).
Proper layout techniques should be used in the grounding network for the VCOMP circuit and the
TPIC46L01/L02/L03. The ground for the predriver and the VCOMP network should be connected to a Kelvin
ground if available; otherwise, a single point connection should be maintained to the power ground of the FET
array. Improper grounding techniques may result in inaccuracies in detecting faults.
External
TPIC46L01/L02
DRAIN5
+
_
DRAIN0
+
_
U1
1.25 V
FLT
A
M
U
X
VCOMP
VCOMPEN
Deglitch
VCOMPEN
1.25 V
VCOMP
0
1
Figure 19
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
17
TPIC46L01, TPIC46L02, TPIC46L03
6-CHANNEL SERIAL AND PARALLEL LOW-SIDE PRE-FET DRIVER
SLIS055A – NOVEMBER 1996 - REVISED SEPTEMBER 1997
MECHANICAL DATA
DB (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
28 PIN SHOWN
0,38
0,22
0,65
28
0,15 M
15
0,15 NOM
5,60
5,00
8,20
7,40
Gage Plane
1
14
0,25
A
0°– 8°
1,03
0,63
Seating Plane
2,00 MAX
0,10
0,05 MIN
PINS **
8
14
16
20
24
28
30
38
A MAX
3,30
6,50
6,50
7,50
8,50
10,50
10,50
12,90
A MIN
2,70
5,90
5,90
6,90
7,90
9,90
9,90
12,30
DIM
4040065 / C 10/95
NOTES: A.
B.
C.
D.
18
All linear dimensions are in millimeters.
This drawing is subject to change without notice.
Body dimensions do not include mold flash or protrusion not to exceed 0,15.
Falls within JEDEC MO-150
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
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