The L9610C/11Cis a monolithic integrated circuit
workingin PWM mode as controller of an external
powerMOStransistorinHighSide Driver configuration.
Features of the device include controlled slope of
the leadingand trailing edgeof the gate drivingvoltage,linearcurrentlimitingwithprotectiontimer,settableswitchingfrequencyfo,TTLcompatibleenable
function,protectionstatus ouput pin. Thedevice is
mountedin SO16micropackage,and DIP16package.
L9610C
L9611C
SO16
ORDERING NUMBERS: L9610C
DIP16
L9611C
BLOCK DIAGRAM
November 1991
This is advanced informationon a new product now in development or undergoing evaluation. Details are subject to change withoutnotice.
1/9
L9610C - L9611C
ABSOLUTE MAXIMUM RATINGS
SymbolParameterValueUnit
V
Max. Supply Voltage26V
S
Transient Peak Supply Voltage (R1 ≥ 100Ω):
Load Dump:
5ms ≤ t
≤ 10ms; τfFall Time Constant = 100ms; R
rise
SOURCE
≥ 0.5Ω
60
Field Decay:
5ms ≤ t
≤ 10ms; τrRise Time Constant = 33ms; R
fall
SOURCE
≥ 10Ω
–80
V
V
T
J/Tstg
Low Energy Spike: t
I
V
Max. Supply Current (t < 300 ms)0.3A
S
Input Voltage–0.3 < VIN<VS– 2.5V
IN
rise
=1µs, t
Junction and Storage Temperature Range– 55 to 150°C
= 2ms, R
fall
SOURCE
≥ 10Ω
±100
THERMAL DATA
SymbolParameterSO16DIP16Value
R
th j-amb
Thermal Resistance Junction-aluminaMax5090°C/W
PI N CONNECTI O N (Top view)
V
2/12
L9610C - L9611C
PIN FUNCTIONS
PinNameFunctions
1INTA Capacitor Connected Between this Pin and Out
Voltage Slew Rate.
2INAnalog Input Controlling the PWM Ratio. The operating range of the input
.
R
3V
R
voltage is 0 to V
Output of an Internal Voltage Reference
4ENTTL Compatible Input for Switching off the Output.
5PWLIf this Pin is Connected to GND and V
Frequency f
are Reduced : this Allows to Transfera Costant Power to the
o
> 13 V, the Duty Cycle and the
S
Load.
6OscCurrent Sink and Source StageConnection of a Triangle Oscillator with
Definite Voltage Swing.
7INDInput of an Operational Amplifier for Short Current Sensing and Regulation.
8NCNot Connected.
9V
S
Common Supply Voltage Input
10GNDCommon Ground Connection
11TIMA Capacitor Connected Between this Pin and GND Defines the Protection
Delay Time.
12MONOpen Collector Monitoring Output off the PowerMOS Protection.
13,15P2, P1Connection for the Charge Pump Capacitor.
14BSThe Capacitor Connected Between thisPin and theSource of the Power MOS
Allows to Bootstrap the Gate Driving Voltage.
16Out GOutput for Driving the Gate of the External PowerMOS.
Defines the GATE
G
3/12
L9610C - L9611C
ELECTRICAL CHARACTERISITCS (T
=–40°Cto85°C;6V<VS<16 V unless otherwise specified)
amb
SymbolParameterTest ConditionsMin.Typ.Max.Unit
V
S
I
q
V
SC
V
SH
V
SL
V
R
I
R
V
INL
K
F
K
S
Operating Supply Voltage616V
Quiescent Current2.56mA
Internal Supply Voltage ClampIS= 200mA283236V
Supply Voltage High Threshold1618.521V
Supply Voltage Low Threshold456V
Reference Voltage3.33.53.7V
Reference Current∆VR≤ 100mV1mA
Input Low Threshold0.130.150.2VIN/V
Oscillator Freq. ConstantNote 18002500nF/s
Gate Voltage Slew Rate
Note 2359nFV/ms
Constant
Protection Time Delay Constant Note 30.120.44ms/nF
Sense Input Volt.80100120mV
Gate Driving Volt. above V
VS= 16V816V
S
Gate Voltage in OFF ConditionIG= 100 µA1.2V
Input Current– 5– 1µA
Low Enable Voltage0.8V
High Enable Voltage2.0V
V
V
V
V
K
T
V
Si
GON
GOFF
I
IN
ENL
ENH
IENEnable Input Current2µA
SRSlew RateWithout C
V
MONsat
Saturation Voltage (pin 12)I
MON = 2.5 mA
S
0.5V/µs
1.5V
R
Notes : 1. fo=KF/CF.
2. dV
3. t
prot=KTCT
/dt= Ks/Cs.
G
.
FUNCTIONAL DE SCRI PTION
PULSEWIDTH COMPARATOR
A ground compatible comparator generates the
PWMsignal whichcontrols thegate of theexternal
powerMOS.
Theslopes of the leadingand trailing edges of the
gate driving signal are defined by the external capacitorC
accordingto :
S
dV
/dt= KS/C
G
S
Thisfeature allowsto optimize theswitching speed
for the powerand RFIperformancebest suitedfor
the application.
Thelowerlimit of theduty cycle is fixedat 15% of
the ratio between the input and the reference voltage(seefig.1).Inputvoltageslowerthanthisvalue
disable the internal oscillator signal and therefore
the gate driver.
GROUNDCOMPATIBLETRIANGLE
OSCILLATOR
The triangle oscillator provides the switching frequencyf
setbytheexternalcapacitorCFaccording
o
to :
f
o=KF/CF
If the pin PWL (power limitation) is connected to
ground and Vs is higher than the PWL threshold
voltage,the duty cycle and thef
TIMERAND PROTECTIONLATCH
When an overcurrent occurs, the device starts
chargingthe externalcapacitorC
; the protection
T
time is set accordingto :
.
t
prot=KT
C
T
4/12
L9610C - L9611C
Afterthe overcurrentprotectiontimeis reached,the
powerMOSisswitched-off; thisconditionis latched
by settinganinternalflip-flopandis externallymonitored by the low state of theMON pin.
Toresetthelatchthesupplyvoltagehastofallbelow
or the devicemust beswitchedoff.
V
SL
UNDER AND OVERVOLTAGE SENSE WITH
LOADDUMP PROTECTION
The undervoltagedetectionfeatureresetsthetimer
and switchesoff theoutputdrivingsignal when the
supplyvoltageisless than V
SL
.
If the supply voltage exceeds the max operating
supply voltage value, an internal comparator disablesthe chargepump,theoscillatorandtheexternal powerMOS.
Figure1 : TypicalTransferCurve.
In both casesthe thresholdsare providedwith suitable hysteresisvalues.
Theloaddumpprotectionfunctionallowsthedevice
to withstand- for alimited time - highovervoltages.
It consistsof an active clamping diodewhich limits
the circuitsupplyvoltageto V
andanexternal
CLAMP
current limiting resistor R1. The maximum pulse
supply current (see abs. max. ratings is equal to
In this conditionthe gate of the powerMOSis held
at the GNDpin potentialand thusthe loadvoltage
is :
V
=Vs-V
L
CLAMP-VGS
5/12
L9610C - L9611C
Figure2 : The Typical Waveformsfor the PowerLimitationFunction.
SHORTCIRCUITCURRENT REGULATION
The maximum load currentin the short circuitcon-
dition can be chosen by the value of the current
sensingresistorR
I
SC=VSI/RS
accordingto :
S
Two identicalVScompatiblecomparators are provided to realize the short circuit protection.
After reaching the lower thresholdvoltage (typical
value V
-10 mV), the first comparator enablesthe
SI
timer and the gateis drivenwith the fullcontinuous
pump voltage : when the upper threshold voltage
valueis reachedthe secondcomparatormaintains
the chosenI
drivingtheNMOSgatein continuous
SC
mode.
This function - showed in fig. 3 - speeds up the
switchon phase fora lamp as a load.
BANDGAP VOLTAGEREFERENCE
CHARGEPUMP
The charge pump circuit holds the N-MOS gate
abovethesupplyvoltageduringtheONphase.This
circuitconsistsofanRCastablewhichdrivesacomparatorwith a push-pulloutputstage. The external
chargepumpcapacitorC
mustbeat least equalto
P
the NMOSparasiticinput capacitance.
ForfastgatevoltagevariationC
mustbeincreased
P
orthebootstrapfunctioncanbeused.Thebootstrap
capacitorshould be at least 10 times greater than
the powerMOSparasiticcapacitance.
The chargepump voltageV
V
=2VS-VBE-V
PUMP
canreach to :
PUMP
CESAT
Thecircuitis disabledifthe supplyvoltageis higher
SH
.
thanV
Figure3 : The Typical Waveformsfor ShortCircuit Current Condition.
L9610C - L9611C
7/12
L9610C - L9611C
APP LI CATI O N CI RCUI T
Figure4.
Note : Allnode voltages arereferred to groundpin (GND)
The currents flowing in the arrow direction are assumed positive
without C
without C
= 1nF
BS:CP
mustbe at least 10 times higher than the gate capacitance : CP= 100 pF.
BS:CBS
CONTROLLINGA 120W HALOGEN LAMP WITH
THEL9610C/11CDIMMER
The L9610C/11CLamp Dimmer is used to control
the brightnessof vehicleheadlampsusingH4 type
lamps(see fig. 5). With switchS1openthe fullsupply voltage is applied to the lamps : closing the
8/12
switch it is a possible to reduce the averagelamp
voltageas desired:
R3
VL = VS
R2+ R3
If pin 5 is connected to ground the average lamp
voltageis constant,even forsupply voltagesin excessof 13V.
Figure5 : ApplicationCircuit.
L9610C - L9611C
The sensing resistor R
and timing capacitor C
S
shouldbe dimensionedaccordingto :
V
RS=
2Inom (@Vs=14V)
2 xlimitation time
C
=
t
Si
K
T
In normal conditions(VCC=14V, maximum brightness) the voltage drop across the sense resistor
must be 50 mV. The current limiter intervenes
attwicethe nominalcurrent,I
nom
.
ThetimingcapacitorC
t
=3.5V)mustbechosen
t(Vct
sothatthedelay beforeinterventionistwicethe durationof the current limitationat power-on.
Theoptimalvalueofthe oscillatorfrequency,taking
tolerancesintoaccount,mustbeslightlyhigherthan
the frequencyat whichlampflicker isnoticable(min
60Hz).
The switching times are a compromise between
possibleEMI andswitchingpower losses.The recommendedvaluefor Cs is47pF.
9/12
L9610C - L9611C
DIP16 PACKAGE MECHANICAL DATA
DIM.
MIN.TYP.MAX.MIN.TYP.MAX.
a10.510.020
B0.771.650.0300.065
b0.50.020
b10.250.010
D200.787
E8.50.335
e2.540.100
e317.780.700
F7.10.280
I5.10.201
L3.30.130
Z1.270.050
mminch
10/12
L9610C - L9611C
DIM.
MIN.TYP.MAX.MIN.TYP.MAX.
A1.750.069
a10.10.250.0040.009
a21.60.063
b0.350.460.0140.018
b10.190.250.0070.010
C0.50.020
c145 (typ.)
D9.8100.3860.394
E5.86.20.2280.244
e1.270.050
e38.890.350
F3.84.00.1500.157
L0.41.270.0160.050
M0.620.024
S8 (max.)
mminch
11/12
L9610C - L9611C
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.
1994 SGS-THOMSON Microelectronics- All Rights Reserved
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