TSM1011 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
TSM1011
STMicroelectronics
'TSM1011' PDF : 14 Pages View PDF
TSM1011
Compensation
6 COMPENSATION
The voltage-control transconductance operational
amplifier can be fully compensated. Both its
output and negative input are directly accessible
for external compensation components.
An example of a suitable compensation network is
shown in Figure 5. It consists of a capacitor
Ccv1=2.2nF and a resistor Rcv1=22KΩ in series.
Fig. 4: Schematic of compensation network
The current-control transconductance 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 Figure 5. It consists of a capacitor
Cic1=2.2nF and a resistor Ric1=22KΩ in series.
Vcc
DS
CS +
Rlimit
Vcc
1
Vref
28V
5 Cv+
R4
10K
TSM1011
CV
Cv-
3 Cc+
CC
Out
+
Cc-
R5 Vsense
Ric2
1K
1K
Rsense IL
Gnd
Ric1
22K
OUT+
D
R2
IL
R3
100
4
7 Rvc1
22K
Cic1
2.2nF
+
Cvc1
2.2nF
R1
OUT-
7 START UP AND SHORT CIRCUIT CONDITIONS
Under start-up or short-circuit conditions the
TSM1011 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.
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.
Therefore, the current limitation can only be
ensured by the primary PWM module, which
should be chosen accordingly.
If the primary current limitation is not considered
to be precise enough for the application, then a
sufficient supply for the TSM1011 has to be
ensured under all conditions. This means that it is
6/9
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