L9610 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L9610' PDF : 12 Pages View PDF
L9610C - L9611C
ELECTRICAL CHARACTERISITCS (Tamb = – 40 °C to 85 °C ; 6 V < VS < 16 V unless otherwise specified)
Symbol
VS
Iq
VSC
VSH
VSL
VR
IR
VINL
KF
KS
KT
VSi
VGON
VGOFF
IIN
VENL
VENH
IEN
SR
VMONsat
Parameter
Operating Supply Voltage
Quiescent Current
Internal Supply Voltage Clamp
Supply Voltage High Threshold
Supply Voltage Low Threshold
Reference Voltage
Reference Current
Input Low Threshold
Oscillator Freq. Constant
Gate Voltage Slew Rate
Constant
Protection Time Delay Constant
Sense Input Volt.
Gate Driving Volt. above VS
Gate Voltage in OFF Condition
Input Current
Low Enable Voltage
High Enable Voltage
Enable Input Current
Slew Rate
Saturation Voltage (pin 12)
Test Conditions
IS = 200mA
∆VR ≤ 100mV
Note 1
Note 2
Note 3
VS = 16V
IG = 100 µA
Without CS
IMON = 2.5 mA
Min.
6
28
16
4
3.3
0.13
800
3
Typ.
2.5
32
18.5
5
3.5
0.15
5
Max.
16
6
36
21
6
3.7
1
0.2
2500
9
Unit
V
mA
V
V
V
V
mA
VIN/VR
nF/s
nFV/ms
0.12
0.44 ms/nF
80
100 120 mV
8
16
V
1.2
V
–5
–1
µA
0.8
V
2.0
V
2
µA
0.5
V/µs
1.5
V
Notes : 1. fo = KF/CF.
2. dVG/dt = Ks/Cs.
3. tprot = KT CT.
FUNCTIONAL DESCRIPTION
PULSE WIDTH COMPARATOR
A ground compatible comparator generates the
PWM signal which controls the gate of the external
powerMOS.
The slopes of the leading and trailing edges of the
gate driving signal are defined by the external ca-
pacitor CS according to :
dVG/dt = KS/CS
This feature allows to optimize the switching speed
for the power and RFI performance best suited for
the application.
The lower limit of the duty cycle is fixed at 15 % of
the ratio between the input and the reference vol-
tage (see fig. 1). Input voltages lower than this value
disable the internal oscillator signal and therefore
the gate driver.
GROUND COMPATIBLE TRIANGLE
OSCILLATOR
The triangle oscillator provides the switching fre-
quency fo set by the external capacitorCF according
to :
fo = 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 the fo frequency are re-
duced : this allows to transfer a costant power to the
load (see fig. 2).
TIMER AND PROTECTION LATCH
When an overcurrent occurs, the device starts
charging the external capacitor CT ; the protection
time is set according to :
tprot = KT . CT
4/12
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