TSM1012IDT STMicroelectronics, TSM1012IDT Datasheet - Page 6

• Manufacturer Part Number: TSM1012IDT
• Description: IC CTRLR BATT CHRGR/ADAPT 8-SOIC
• Manufacturer: STMicroelectronics

Specifications of TSM1012IDT

• Function: Charge Management
• Battery Type: All Battery Types
• Voltage - Supply: 4.5 V ~ 28 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Product: Charge Management
• Output Current: 10 mA
• Operating Supply Voltage: 4.5 V to 28 V
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-6623-2; TSM1012IDT

TSM1012
The current-control trans-conductance operation-
al 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
3. Start Up and Short Circuit Conditions
Under start-up or short-circuit conditions the
TSM1012 is not provided with a high enough sup-
ply 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 en-
sured 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 suffi-
cient supply for the TSM1012 has to be ensured
under any condition. It would then be necessary to
add some circuitry to supply the chip with a sepa-
rate power line. This can be achieved in numerous
ways, including an additional winding on the trans-
former.
Figure 5 :
6/8
controller
PWM
primary side
optocoupler
D1
D2
Rlimit
C1
C2
in series.
47nF
C4
R4
R5
Rsense
1
5
3
TSM1012
CV+
CC+
CC-
4. Voltage clamp
The following schematic shows how to realize a
low-cost power supply for the TSM1012 (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 TSM1012
supply voltage is 28V. In the aim to protect he
TSM1012 against such how voltage values a in-
ternal zener clamp is integrated.
Rlimit = (Vcc-Vz)Ivz
Figure 4 : Clamp voltage
2
Vref
1,25V
Ric2
1K
Gnd
CV
CC
cc
Vcc
6
28V
TSM1012
8
Ric1
22K
CV-
Out
Rlimit
7
4
Ivz
R3
2,2nF
Rvc1
Cic1
22K
Vcc
2,2nF
Cvc1
Vz
28V
secondary side
optocoupler
R2
R1
C3
OUT+
OUT-