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PDF TSM108I Data sheet ( Hoja de datos )

Número de pieza TSM108I
Descripción AUTOMOTIVE SWITCH MODE VOLTAGE AND CURRENT CONTROLLER
Fabricantes STMicroelectronics 
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No Preview Available ! TSM108I Hoja de datos, Descripción, Manual

TSM108
AUTOMOTIVE SWITCH MODE
VOLTAGE AND CURRENT CONTROLLER
s CURRENT MEASUREMENT ON OUTPUT
POSITIVE LINE
s CONSTANT VOLTAGE MODE CONTROL
s CONSTANT CURRENT MODE CONTROL
s PRECISION VOLTAGE AND CURRENT
CONTROL LOOPS
s ADJUSTABLE SWITCHING FREQUENCY
s ADJUSTABLE OVER VOLTAGE LOCKOUT
s ADJUSTABLE UNDER VOLTAGE LOCKOUT
s STANDBY MODE (LOW QUIESCENT
CURRENT)
s SUSTAINS 60V
s MINIMAL EXTERNAL COMPONENTS
COUNT
s DRIVING ABILITY FOR EITHER P-MOSFET
OR PNP TRANSISTORS
DESCRIPTION
TSM108 is a P-channel MOSFET controller which
ensures constant voltage and constant current in
Switching Mode Power Supply (step down) like in
automotive battery charging applications.
TSM108 can easily be configured for very wide
voltage and current needs.
TSM108 is built in rugged BCD technology and
includes a PWM generator, Voltage and Current
control loops, a precision Voltage Reference, and
a P-Mosfet Gate Drive output. TSM108 can
sustain 60V on Vcc, and therefore meet the
standard Load Dump requirements in the
Automotive field.
TSM108 includes security functions which lock the
PMosfet in OFF state: OVLO (Over Voltage
Lockout) and UVLO (Under Voltage Lockout). The
P-Mosfet Gate is also protected from over voltage
drive thanks to a 12V clamping protection circuit.
TSM108 includes a standby feature which allows
very low quiescent current when activated, as well
as safe P-Mosfet Off state.
TSM108 is suitable for car environment
accessories, as well as numerous other DC/DC
step down regulation.
APPLICATION DIAGRAM
MOSFET P
or PNP
TSM108
D
SO14
(Plastic Micropackage)
ORDER CODE
Part Number Temperature Range
TSM108I
-40°, +125°C
Package
D
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
VCC 1
!STBY 2
GND 3
UV 4
OV 5
G6
OSC 7
14 GD
13 VS
12 ICTRL
11 VCTRL
10 VREF
9 ICOMP
8 VCOMP
November 2001
1/13

1 page




TSM108I pdf
OSCILLATOR FREQUENCY VERSUS TIMING CAPACITOR
350
300
250
200
150
100
50
0
10
100
Oscilla tor fre que ncy (kHz )
TSM108
1000
TSM108 AS A STAND ALONE DC/DC CONVERTER FOR CIGARETTE LIGHTER ACCESSORIES
L2
1
Cf Rf Q1
MOSFET P
L1
Rsense
1
Csupply
D
1
Vcc
Gnd
!Stby
UV
OV
+-
Osc
Cosc
1
+ Vs
-
-
+
Vs
Ictrl
Icomp
Vcomp
Vref
Vctrl
G
Comp Comp
R1
R2
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5 Page





TSM108I arduino
TSM108
12. Measured Performances
The few following curves show the measured
performances of TSM108 used in DC/DC step
down converter, either with a Pchannel MOSFET
or with a PNP bipolar transistor.
12.1. Voltage and Current Control, Efficiency Performances using a Pchannel MOSFET:
CV & CC Regulation - Switching duty cycle vs Iout
Vin = 12V, Vout = 6V, Iout = 600mA
7 70%
6 60%
5 50%
4 40%
3 30%
2 20%
1 10%
0 0%
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Iout (A)
Converter efficiency & Switching duty cycle vs Iout
Vin = 12V, Vout = 6V, Iout = 600mA
100%
100%
90%
90%
80%
80%
70%
70%
60%
60%
50%
50%
40%
40%
30%
30%
20%
20%
10%
10%
0%
0
0%
0.1 0.2 0.3 0.4 0.5 0.6 0.7
Iout (A)
6.001
6
5.999
5.998
5.997
5.996
5.995
5.994
5.993
5.992
5
Vout & Efficiency versus Vin
Vout = 6V, Iout = 600mA
10 15 20 25 30
Vin (V)
86%
85%
84%
83%
82%
81%
80%
79%
78%
77%
35
11/13

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