FDMS2380 Datasheet FDMS2380 | P4-P6

FDMS2380 Dual Integrated Solenoid Driver

FDMS2380 Rev. A

www.fairchildsemi.com4

Electrical Characteristics T

= 25°C unless otherwise noted

Off Characteristics

On Characteristics

Switching Characteristics

(Excitation Path)

Logic Input Characteristics

Protection and Diagnostics Characteristics

(Note 1)

Notes:

1. Integrated protection functions, as described in this data sheet, are designed to prevent the destruction of the IC and these fault conditions are considered ‘outside’

the normal operating ranges. It is important to note that the protection functions integrated into this device are NOT designed for continuous repetitive operation.

Symbol Parameter Test Conditions Min Typ Max Units

BATT(Oper)

Operating Supply Voltage --- 6.0 14.0 26.0 V

Supply Quiescent Current V

BATT

= 13V, V

INA

= V

INB

= 5V - 9.3 15 mA

Output Leakage Current V

BATT

= 18V, V

INA

= V

INB

= 1.5V - 0.2 5 mA

DS(ON)

On Resistance - Excitation Path

BATT

= 13V, V

INA

= V

INB

= 5V, - 0.030 0.080 Ω

OUT

= 5A T

= 150

C - 0.050 0.100 Ω

Recir(sat)

Saturation Voltage - Recirculation

Path

BATT

= 13V, V

INA

= 5V,

INB

= 0V, I

OUT

= 10A

-1.41.8V

d(ON)

Output Turn-On Delay Time

BATT

= 14V, R

Load

= 2.5Ω

-7.030μs

d(OFF)

Output Turn-Off Delay Time - 8.3 30 μs

Rise Time - 6.5 10 μs

Fall Time - 3.0 10 μs

Input Low Level Voltage --- - - 1.5 V

Input High Level Voltage --- 3.5 - - V

Input Clamp Voltage I

<=10mA 5.5 - - V

Input Current (each input)

INA

= V

INB

= 5V - 90 160 μA

INA

= V

INB

= 1.5V 20 60 - μA

J(tsd)

Thermal Shut-down Junction

Temperature

--- 160 172 185

OUT(trip)

Output Current Trip --- 15 20 30 A

BATT(ov)

Over-voltage Threshold --- 27 29 32 V

BATT(uv)

Under-voltage Threshold --- - 5.1 5.5 V

OUT(ol)

Open Load Detect Current V

INA

= 5V, V

INB

= falling edge 300 450 800 mA

OUT(SS)

Soft Short Detect Voltage INA=0, INB=1, V

BATT

− V

OUT

0.30.430.6 V

Soft Short Resistance INA=0, INB=1, from V

OUT

to V

BATT

50 75 140 Ω

Soft Short Active Time INA=0, INB=1, time R

is active 1 - 3 ms

OUT(cl1)

NDMOS Over-voltage Clamp Ref to GND; I

OUT

= 5A 60 73 85 V

OUT(cl2)

Output Inductive Clamp Voltage V

OUT

− V

BATT

; I

OUT

= 5A 27 30 33 V

Flyback Diagnostic Threshold

Voltage (V

OUT

− V

BATT

)

Threshold where DIAG goes low

during Fast turn-off Mode

22 23 33 V

(DIAG)

Diagnostic Propagation Delay Time Fast turn-off Mode; V

DIAG

= 1V - 3 10 μs

DAIGFB

(min)

Minimum Diagnostic Flyback Time --- 26 42 50 μs

DIAG(prot)

Protection Diagnostic Pulse Width

Over-voltage, Under-voltage,

Over-current, Over-temperature

2710μs

DIAG(low)

Diagnostic Voltage Low

DIAG

<= 1mA,

Diagnostic output active

--0.9V

DIAG(cl)

Diagnostic Output Clamp Voltage I

DIAG

<= 10mA 5.5 - - V

FDMS2380 Dual Integrated Solenoid Driver

FDMS2380 Rev. A

www.fairchildsemi.com5

Normal operation (see figure 1)

STANDBY MODE, INA = INB = 0 In the Standby mode, INA

and INB are in the logic low state and there is no output

current flow through solenoid coil. Both the PDMOS and

NDMOS output power transistors are in their off state. This

is the condition either at the start of a cycle to activate the

solenoid or after a flyback signal has been generated.

EXCITATION MODE, INA = INB = 1 In the Excitation mode,

INA and INB are in the logic high state and the NDMOS

power transistor is turned on to sink current through the coil

connected to the positive supply.

The output current rises in this condition until limited by

either the coil resistance or the FDMS2380 if the current

reaches the output current trip level I

OUT(trip)

in which case

the FDMS2380 will turn off the NDMOS and issue a

protection diagnostic signal.

RECIRCULATION MODE, INA = 1, INB = 0 The

Recirculation mode normally follows the Excitation mode. In

this mode the NDMOS is turned off and the PDMOS is on.

The current in the coil, connected to the output, is re-

circulated to the positive power supply pin through the low

impedance path of the recirculation diode and the PDMOS

transistor. In the Recirculation mode the coil current I

OUT

slowly decays due to the impedance of the inductive load

and the forward voltage drop across the FDMS2380

recirculation path.

The FDMS2380 will also enter the Recirculation mode

during over-voltage, over-current, and over-temperature

conditions as a means to limit the power dissipation in the

device.

FAST TURN-OFF MODE, INA −> 0 The fast turn-off mode

is initiated whenever the INA pin transitions from a logic high

to low state with INB also in a logic low state. In this mode

the output voltage “flies back" to V

BATT

OUT(cl2)

where it is

clamped by the FDMS2380 and the coil current is

recirculated through the device back to the V

BATT

supply.

The larger amplitude flyback voltage causes the coil current

to rapidly discharge shutting off the solenoid. This flyback

condition shall last as long as the output voltage is greater

then V

BATT

and less then V

OUT(cl1)

. During this time, the

output diagnostic pin DIAG is driven low for the duration of

the flyback pulse. Any output flyback pulses which are less

then the period t

DIAGFB(min)

will have its corresponding

diagnostic pulse lengthened to a minimum of t

DIAGFB(min)

help identify the flyback condition from a possible protection

diagnostic fault.

If an under-voltage condition exists the flyback diagnostic

pulse will be blocked, however, a flyback diagnostic pulse is

generated if the flyback condition is still present at the end of

the under-voltage condition.

For inputs INA and INB in the logic low state the NDMOS

and PDMOS transistors will be off. Exceptions to this

condition are; during an alternator load dump event that

could drive the output to greater then V

OUT(cl1)

the NDMOS

will clamp the output voltage, and during a flyback event the

PDMOS will clamp the output to V

OUT(cl2)

Using the curves from figures 7 through 12, the driving

parameters (e.g., maximum duty cycle, etc.) and/or the

solenoid characteristics (e.g., coil resistance or coil

inductance) must be checked to ensure the FDMS2380 is

not damaged by SCIS (self-clamped inductive switching)

related overstress.

SOFT SHORT TEST MODE, INA = 0 INB = 1 This test mode

is used for detecting an output ground fault. The Soft Short

mode is initiated any time INA=0 and INB=1 when in the

Standby mode. The input conditions need to be held for a

minimum of 2 ms to allow for the timing of the Soft Short

detection circuit. After this setup time the FDMS2380

switches in a resistance (R

) of approximately 75 ohms

between V

BATT

and the output (OUT) pin. This resistance,

connected in parallel to the load, acts as an additional pull-

up impedance to the positive power supply. To minimize

power dissipation in the event of an output ground fault, the

output pull-up resistor, activated in the Soft Short mode, is

only switched on for a period of Tss by the FDMS2380.

Regardless if the INA and INB signals remain in the Soft

Short state for a longer period of time. Immediately prior to

the end of this period, the output voltage V

OUT

is compared

to the V

BATT

supply voltage and if the difference is greater

then V

OUT(ss)

the diagnostic pin DIAG is pulled low. The

diagnostic pin will stay activated until the Soft Short mode is

terminated by a change of the INA or INB inputs.

To minimize the power dissipation the Soft Short test mode

should not be restarted sooner than 10 ms after a previous

Soft Short test.

Self-Protection Functions

Refer to figures 2 through 6 for self-protection waveforms.

All self-protection modes except over-voltage and under-

voltage are reset when INA goes to logic 0. When a self-

protection condition is detected the FDMS2380 will issue a

protection fault on the diagnostic pin. This fault condition is

signaled by a 2 μs to 10 μs pulse t

DIAG(prot)

on the diagnostic

pin DIAG. If the INA pin is activated while the condition

setting the protection fault is still active additional protection

fault diagnostic pulses will be issued.

Current Trip (see figure 2) Anytime during Excitation mode,

if the current in the NDMOS rises above the I

OUT(trip)

level,

the FDMS2380 will turn off the NDMOS and enter into the

Recirculation mode and issue a 2 μs to 10 μs protection fault

pulse on the diagnostic pin DIAG. The device will remain in

this Recirculation mode as long as the INA pin remains high

and is terminated with the falling edge of INA.

Thermal Shutdown (see figure 3) The FDMS2380 is

internally protected against over-temperature conditions by

a temperature sensing circuit. When the FDMS2380

junction temperature exceeds the protection limit, T

J(tsd)

thermal shutdown of the device will occur. Upon entering

thermal shutdown a 2 μs to 10 μs protection fault signal is

activated in the DIAG pin. In thermal shutdown, the NDMOS

is switched off and the FDMS2380 operates in recirculation

to discharge the energy in the load coil and minimize power

dissipation. The FDMS2380 will remain in this state until INA

is taken to logic 0. A protection fault signal will be issued

each time INA is brought to a logic high while the over-

temperature conditions exists.

FDMS2380 Dual Integrated Solenoid Driver

FDMS2380 Rev. A

www.fairchildsemi.com6

Overvoltage (see figure 4) While in the Excitation mode if

the V

BATT

pin rises above the over-voltage threshold,

BATT(ov)

, the FDMS2380 is forced into the Recirculation

mode and a protection fault signal on the diagnostic pin

DIAG is generated. This condition is not reset by INA going

low but by the voltage of the V

BATT

pin returning below the

BATT(ov)

level. A protection fault pulse will be issued each

time the device is driven into the Excitation state while the

over-voltage condition exists.

The FDMS2380 is designed with a fast responding over-

voltage circuit that disables the output slope control circuit

which minimizes radiated EMI. However, voltage transitions

on the V

BATT

pin which exceed 30 volts above the battery

need to be limited to a rise time no faster then 2.2 V/μs

through the use of a power supply bypass capacitor.

Undervoltage (see figure 6) The FDMS2380 will operate

down to a minimum voltage of V

BATT(uv)

. If the battery supply

drops below this minimum voltage the device is forced into

the Standby mode. If INA is high during this condition a 2 μs

to 10 μs protection fault pulse is issued on the diagnostic

DIAG pin. In addition, a diagnostic pulse will be generated

each time INA transitions from a low to a high logic level

while remaining in this under-voltage condition.

The FDMS2380 will return to normal operation when V

BATT

is 6 volts or greater.

Diagnostic Functions

Open Load Detect (see figure 5) While INA and INB are

high, if the load current fails to rise above the open load

current level, I

OUT(ol)

, before INB transitions low an open

load diagnostic fault will be issued. The diagnostic pin will

be driven low on the falling edge of the INB signal and

remain low until INA is returned to a logic 0 condition. The

open load detect mechanism senses current flowing through

the NDMOS at the falling edge of the INB signal. If an open

load condition exists during the Excitation phase but is

corrected before the INB falling edge the open load

condition would not be detected and the open load

diagnostic fault would not be generated.

The open load detection circuit does not alter the operation

of the FDMS2380 and the PDMOS and NDMOS output

transistors will be driven into the operational modes as

commanded by the INA and INB inputs.

If during the detection of the open load condition a protection

fault condition also arises, the open load diagnostics will be

terminated and then after a 2 μs to 10 μs blanking period the

protection diagnostic will be generated.

Operational Truth Table

H = High, L = Low, X = Don’t Care

General operation INA and INB are standard logic inputs that control Standby, Excitation, Recirculation, Diagnostics, and

Fast turn-off modes in the FDMS2380.

Conditions INA INB NDMOS PDMOS

Standby Mode: L L OFF OFF

Soft Short Test Mode L H OFF ON

Excitation Mode: (No protection faults) H H ON ON

Recirculation Mode H L OFF ON

Fast Turn-off Mode: V

< V

OUT

< V

OUT(cl1

)LLOFF

OUT

clamped

to V

OUT(cl2)

Alternator Load Dump: V

OUT

> V

OUT(cl1)

NDMOS in UIS

operation

Thermal Shutdown: T

> T

J(tsd)

HXOFF ON

Current Trip: I

OUT

> I

OUT(trip)

HHOFF ON

Overvoltage: V

BATT

> V

BATT(ov)

HHOFF ON

Undervoltage: V

BATT

< V

BATT(uv)

HXOFF OFF

Open Load: I

OUT

< I

OUT(ol)

refer to Open Load waveforms

(Figure 5)

-- - -

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FDMS2380

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Gate Drivers Dual Integ Solenoid

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