TSM1052 ,Constant voltage and constant current controller for battery chargers and adaptersElectrical characteristics . . . . . 53 Typical characteristics . . . . . . . 64 Applicat ..
TSM105CD ,CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER FOR BATTERY CHARGERS AND ADAPTORSELECTRICAL CHARACTERISTICSTamb = 25°C and Vcc = +5V (unless otherwise specified) S ..
TSM106ID ,Dual Operational Amplifier and Voltage ReferenceElectrical characteristics for operator 2 (independant op-amp): VCC+ = +5V, VCC = Ground, Vo = 1.4V ..
TSM106IDT ,Dual Operational Amplifier and Voltage ReferenceElectrical characteristics for operator 2 (independant op-amp): VCC+ = +5V, VCC = Ground, Vo = 1.4V ..
TSM107IDT ,Triple Operational Amplifier and Voltage Reference-+-+-+TSM107Triple Operational Amplifier and Voltage ReferenceOperational Amplifier:■ Medium bandwi ..
TSM108ID ,AUTOMOTIVE SWITCH MODE VOLTAGE & CURRENT CONTROLLERapplications. Part Number Temperature RangeDTSM108 can easily be configured for very wideTSM108I -4 ..
UC2827DW-1G4 ,Buck Current/Voltage Fed Push-Pull PWM Controllers 24-SOIC -40 to 85ELECTRICAL CHARACTERISTICSUnless otherwise spsecified, V = 15 V, V = 14.3 V, C = 340 pF, R = 10 kΩ, ..
UC2827DW-2 ,1FEATURESDESCRIPTION• Ideal for Multiple Output and/or HighThe UC3827 family of controller devices p ..
UC2827DW-2 ,1ELECTRICAL CHARACTERISTICSUnless otherwise spsecified, V = 15 V, V = 14.3 V, C = 340 pF, R = 10 kΩ, ..
UC2827DW-2 ,1features of the UC3827 include bidirectional synchronization capability, user programmableoverlap t ..
UC2827DWTR-1 ,1FEATURESDESCRIPTION• Ideal for Multiple Output and/or HighThe UC3827 family of controller devices p ..
UC2827N-2 ,1features of the UC3827 include bidirectional synchronization capability, user programmableoverlap t ..
TSM1052
Constant voltage and constant current controller for battery chargers and adapters
February 2008 Rev 2 1/15
TSM1052Constant voltage and constant current controller
for battery chargers and adapters
Features Secondary-side constant voltage and constant
current control Very low voltage operation Very low quiescent consumption High-accuracy internal reference Low external component count Wired-or open-drain output stage Easy frequency compensation SOT23-6 micro package
Applications Battery chargers AC DC adapters
DescriptionThe TSM1052 is a highly integrated solution for
SMPS applications requiring a dual control loop to
perform CV (constant voltage) and CC (constant
current) regulation.
The TSM1052 integrates a voltage reference, two
op amps (with OR-ed open-drain outputs), and a
low-side current sensing circuit.
The voltage reference, along with one op amp, is
the core of the voltage control loop; the current
sensing circuit and the other op amp make up the
current control loop.
The external components needed to complete the
two control loops are: A resistor divider that senses the output of the
power supply (adapter, battery charger) and
fixes the voltage regulation set point at the
specified value; A sense resistor that feeds the current sensing
circuit with a voltage proportional to the dc
output current; this resistor determines the
current regulation set point and must be
adequately rated in terms of power dissipation; Frequency compensation components
(RC networks) for both loops.
The TSM1052, housed in one of the smallest
package available, is ideal for space-shrunk
applications such as adapters and chargers.
Table 1. Device summary
Contents TSM10522/15
Contents Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.3 Internal schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84.1 T ypical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2 Voltage and current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2.1 Voltage control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4.2.2 Current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.3 Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.4 Start up and short circuit conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TSM1052 Description 3/15
1 Description
1.1 Pin connection
Figure 1. Pin Connection (top view)
1.2 Pin description
Table 2. Pin description
Description TSM1052
4/15
1.3 Internal schematic
Figure 2. Internal schematic
1.4 Absolute maximum ratings
1.5 Thermal data
Table 3. Absolute maximum ratings
Table 4. Thermal data
TSM1052 Electrical characteristics 5/15
2 Electrical characteristics
TJ = 25 °C and VCC = 5 V, unless otherwise specified
Table 5. Electrical characteristics Specification referred to -10 °C < TA < 85 °C If the voltage on Vctrl (the negative input of the amplifier) is higher than the positive amplifier input
(Vref = 1.21 V), and it is increased by 1mV, the sinking current at the output OUT will be increased by
3.5 mA. The internal Voltage Reference is set at 1.21 V (bandgap reference). The voltage control loop precision
takes into account the cumulative effects of the internal voltage reference deviation as well as the input
offset voltage of the transconductance operational amplifier. The internal Voltage Reference is fixed by
bandgap, and trimmed to 0.5% accuracy at room temperature. When the positive input at Ictrl is lower than -200 mV, and the voltage is decreased by 1mV, the sinking
current at the output Out will be increased by 7 mA. The internal current sense threshold is set at -200 mV. The current control loop precision takes into
account the cumulative effects of the internal voltage reference deviation as well as the input offset voltage
of the transconductance operational amplifier.
Typical characteristics TSM1052
6/15
3 Typical characteristics
Figure 3. Vref vs ambient temperature Figure 4. VSENSE vs ambient temperature
Figure 5. V SENSE pin input bias current vs
ambient temperature
Figure 6. I CTRL pin input bias current vs
ambient temperature
Figure 7. Transconductances (sink current
only) of voltage control loop op amp
vs ambient temperature
Figure 8. Transconductance (sink current
only) of current control loop op amp
vs ambient temperature
TSM1052 Typical characteristics 7/15
Figure 9. Low output level of voltage control
loop op amp vs ambient
temperature (2 mA sink current)
Figure 10. Low output level of current control
loop op amp vs ambient
temperature (2 mA sink current)
Figure 11. Output short circuit current of
voltage control loop op amp vs
ambient temperature
Figure 12. Output short circuit current of
current control loop op amp vs
ambient temperature
Figure 13. Supply current vs ambient
temperature
Figure 14. Low output level vs sink current
Application information TSM1052
8/15
4 Application information
4.1 Typical application schematic
Figure 15. Typical adapter or battery charger application using the device
In the above application schematic, the device is used on the secondary side of a flyback
adapter (or battery charger) to provide an accurate control of voltage and current. The
above feedback loop is made with an optocoupler.
4.2 V oltage and current control
4.2.1 Voltage control
The voltage loop is controlled via a first transconductance operational amplifier, the voltage
divider R1, R2, and the optocoupler which is directly connected to the output. Its possible to
choose the values of R1 and R2 resistors using Equation 1:
Equation 1
where Vout is the desired output voltage.
As an example, with R1 = 100 kΩ and R2 = 27 kΩ, VOUT = 5.7 V
