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TSM1013 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. TSM1013
Description  Constant Voltage and Constant Current Controller for Battery Chargers and Adaptors
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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TSM1013 Datasheet(HTML) 6 Page - STMicroelectronics

   
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TSM1013
START UP AND SHORT CIRCUIT CONDITIONS
6/8
The
voltage-control
trans-conductance
operational amplifier can be fully compensated.
Both of its output and negative input are directly
accessible
for
external
compensation
components.
An example of a suitable compensation network is
shown in Fig.2. It consists of a capacitor
Cvc1=2.2nF and a resistor Rcv1=22K
Ω in series.
The
current-control
trans-conductance
operational amplifier can be fully compensated.
Both of its output and negative input are directly
accessible
for
external
compensation
components.
An example of a suitable compensation network is
shown in Fig.2. It consists of a capacitor
Cic1=2.2nF and a resistor Ric1=22K
Ω in series.
5
START UP AND SHORT CIRCUIT
CONDITIONS
Under start-up or short-circuit conditions the
TSM1013 is not provided with a high enough
supply voltage. This is due to the fact that the chip
has its power supply line in common with the
power supply line of the system.
Therefore, the current limitation can only be
ensured by the primary PWM module, which
should be chosen accordingly.
If the primary current limitation is considered not
to be precise enough for the application, then a
sufficient supply for the TSM1013 has to be
ensured under any condition.
It would then be
necessary to add some circuitry to supply the chip
with a separate power line. This can be achieved
in numerous ways, including an additional winding
on the transformer.
6
VOLTAGE CLAMP
The following schematic shows how to realise a
low-cost power supply for the TSM1013 (with no
additional windings).Please pay attention to the
fact that in the particular case presented here, this
low-cost power supply can reach voltages as high
as twice the voltage of the regulated line. Since
the Absolute Maximum Rating of the TSM1013
supply voltage is 28V. In the aim to protect he
TSM1013 against such how voltage values a
internal zener clamp is integrated.
Rlimit = (Vcc-Vz)Ivz
Fig. 4: Clamp voltage
Fig. 5:
Vz
28V
Vcc
Rlimit
cc
Ivz
TSM1013
+
CS
DS
D
R2
R1
Rsense
Rvc1
22K
Cvc1
2.2nF
Ric1
22K
OUT+
OUT-
+
Cic1
2.2nF
IL
Ric2
1K
R5
10K
R4
100K
R3
100
IL
Vsense
+
Rlimit
Vcc
28V
Vcc
Cv-
CV Out
Gnd
Cc-
Cc+
Vref
1
4
5
3
7
CV
CC
CC Out
TSM1013


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