TSM1013 STMicroelectronics, TSM1013 Datasheet - Page 6

• Manufacturer Part Number: TSM1013
• Description: Constant Voltage and Constant Current Controller for Battery Chargers and Adaptors
• Manufacturer: STMicroelectronics

TSM1013
The
operational amplifier can be fully compensated.
Both of its output and negative input are directly
accessible
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
The
operational amplifier can be fully compensated.
Both of its output and negative input are directly
accessible
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 in series.
5
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
Fig. 5:
6/8
START UP AND SHORT CIRCUIT
CONDITIONS
voltage-control
current-control
for
for
DS
Vcc
external
external
CS
+
trans-conductance
trans-conductance
+
R4
100K
R5
10K
compensation
compensation
Rsense
1
3
Vsense
in series.
Cc+
IL
Rlimit
Cc-
Vref
Ric2
1K
Vcc
TSM1013
START UP AND SHORT CIRCUIT CONDITIONS
CV
CC
Gnd
28V
CV Out
CC Out
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
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
Ric1
22K
Cv-
VOLTAGE CLAMP
5
4
7
cc
Rvc1
22K
Cic1
2.2nF
R3
100
TSM1013
Rlimit
2.2nF
Cvc1
D
Ivz
R2
R1
+
IL
Vcc
OUT+
OUT-
Vz
28V