TSM1051_08 [STMICROELECTRONICS]
Constant voltage and constant current controller for battery chargers and adaptors; 恒定电压和恒定电流控制器电池充电器和适配器
| 型号： | TSM1051_08 |
| 厂家： | 
ST |
| 描述： | Constant voltage and constant current controller for battery chargers and adaptors |
| 文件： | 总15页 (文件大小：316K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TSM1051
Constant voltage and constant current controller
for battery chargers and adaptors
Features
■ Constant voltage and constant current control
■ Low voltage operation
■ Precision internal voltage reference
■ Low external component count
■ Current sink output stage
■ Easy compensation
SO-8
SOT23-6
■ Low AC mains voltage rejection
Description
The only external components are:
The device is is a highly integrated solution for
SMPS applications requiring CV (constant
voltage) and CC (constant current) mode.
– A resistor divider to be connected to the
output of the power supply (adaptor, battery
charger) to set the voltage regulation by
dividing the desired output voltage to match
the internal voltage reference value.
It integrates one voltage reference, two
operational amplifiers (with ORed outputs -
common collectors), and a current sensing circuit.
– A sense resistor having a value and
allowable dissipation power which need to
be chosen according to the internal voltage
threshold.
The voltage reference combined with one
operational amplifier makes it an ideal voltage
controller; the current sensing circuit and the
other operational amplifier make up the current
control loop.
– Optional compensation components (RC).
Housed in one of the smallest package available,
it is ideal for space-shrunk applications such as
adaptors and battery chargers.
Applications
■ Adaptors
■ Battery chargers
Table 1.
Device summary
Order codes
Package
Packaging
TSM1051CLT
TSM1051CD
TSM1051CDT
SOT23-6
SO-8
Tape and reel
Tube
SO-8
Tape and reel
February 2008
Rev 3
1/15
www.st.com
15
Contents
TSM1051
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
1.3
1.4
1.5
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1
3.2
Internal schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
5
Typical electrical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1
Voltage and current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1.1
5.1.2
Voltage control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Current control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2
5.3
Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Start up and short circuit conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
6
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
TSM1051
Description
1
Description
1.1
Pin connection
Figure 1. Pin connection (top view)
-8
1.2
Pin description
Table 2.
Name
Pin out
Pin n°
Type
Function
SOT23 - 6
SO-8
Vctrl
Gnd
1
2
1
8
Analog input Input pin of the voltage control loop
Power supply Ground line. 0 V reference for all voltages
Current sink
Out
3
7
Output pin. sinking current only
output
Ictrl
Vsense
VCC
Nc
4
5
6
6
3
2
5
4
Analog input Input pin of the current control loop
Analog input Input pin of the current control loop
Power supply Positive power supply line
Not internally connected
Nc
Not internally connected.
3/15
Description
TSM1051
1.3
Absolute maximum ratings
Table 3.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
VCC
VI
DC supply voltage
14
-0.3 to Vcc
150
V
V
Input voltage
TJ
Maximum junction temperature
°C
1.4
1.5
Thermal data
Table 4.
Symbol
RthJA
Thermal data
Parameter
SOT23 - 6
SO-8
Unit
Thermal resistance junction ambient
250
130
°C/W
Operating conditions
Table 5.
Symbol
Recommended operating conditions
Parameter
DC supply conditions
Ambient temperature range
Value
Unit
VCC
TA
2.5 to 12
0 to 85
V
°C
4/15
TSM1051
Electrical characteristics
2
Electrical characteristics
T = 25 °C and V = +5 V (unless otherwise specified)
A
CC
Table 6.
Symbol
Electrical characteristics
Parameter
Test condition Min
Typ
Max
Unit
Total current consumption
1.1
1.2
2
Total supply current - not taking the
output sinking current into account
ICC
mA
0 < TA < 85 °C
Voltage control loop
1
3.5
2.5
Transconduction gain (Vctrl). sink
Gmv
Vref
Iibv
mA/mV
current only (1)
0 < TA < 85 °C
1.198 1.21 1.222
Voltage control loop reference (2)
V
0 < TA < 85 °C 1.186
1.234
50
Input bias current (Vctrl)
nA
0 < TA < 85 °C
100
Current control loop
Transconduction Gain (Ictrl). Sink
Gmi
1.5
196
192
7
mA/mV
mV
Current Only (3)
IO = 2.5 mA
200
204
208
VSENSE Current control loop reference (4)
0 < TA < 85 °C
IO = 2.5 mA
25
50
Iibi
Current out of pin ICTRL at -200 mV
µA
0 < TA < 85 °C
Output stage
Low output voltage at 10 mA sinking
VOL
200
mV
mA
current
27
35
50
Output short circuit current. output to
vcc. sink current only
IOS
0 < TA < 85 °C
1. If the voltage on VCTRL (the negative input of the amplifier) is higher than the positive amplifier input(Vref
1.210 V), and it is increased by 1mV, the sinking current at the output OUT will be increased by 3.5 mA.
=
2. The internal Voltage Reference is set at 1.210 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 trans-conductance operational amplifier. The internal Voltage Reference is fixed by
bandgap, and trimmed to 0.5 % accuracy at room temperature.
3. 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.
4. The internal current sense threshold is set to -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 trans-conduction operational amplifier.
5/15
Schematics
TSM1051
3
Schematics
3.1
Internal schematic
Figure 2. Block diagram
Vcc
6
1.210 V
+
+
-
3
OUT
1
2
Vctrl
GND
200 mV
+
-
4
5
Ictrl
Vsense
3.2
Typical application circuit
Figure 3. Typical adaptor or battery charger application using the device
Vcc
TSM1051
R1
6
Rled
1.210 V
+
+
-
3
OUT
Rvc1
Cvc1
1
2
Vctrl
GND
Vout
200 mV
+
-
Cic1
R2
Ric1
4
5
Ictrl
Vsense
Ric2
Rsense
Iout
In the above application schematic, the device is used on the secondary side of a flyback
adaptor (or battery charger) to provide an accurate control of voltage and current. The
above feedback loop is made with an optocoupler.
6/15
TSM1051
Typical electrical performance
4
Typical electrical performance
Figure 4. Vref vs ambient temperature Figure 5. Vsense vs ambient temp.
Figure 6. Vsense pin input bias current Figure 7. Ictrl pin input bias current vs
vs ambient temperature ambient temperature
Figure 8. Output short circuit current vs Figure 9. Supply current vs ambient
ambient temperature temperature
7/15
Application information
TSM1051
5
Application information
5.1
Voltage and current control
5.1.1
Voltage control
The voltage loop is controlled via a first transconductance operational amplifier, the voltage
divider R , R , and the optocoupler which is directly connected to the output. Its possible to
1
2
choose the values of R1 and R2 resistors using Equation 1.
(VOUT – VREF
)
---------------------------------------
R1 = R2 ⋅
Eq:1
VREF
where Vout is the desired output voltage.
To avoid the discharge of the load, the voltage divider R , R should be highly resistive. For
1
2
this type of application, it is suggested a total value of 100 kΩ (or more) for resistors R1 and
R2
As an example, with R = 33 kΩ, V
= 5 V, V
= 1.210 V, then R = 103.4 kΩ
REF 1
2
OUT
Please note that if a low drop diode is inserted between the load and the voltage divider of
the voltage control loop in order to avoid current flowing from the load through the voltage
divider, the diode voltage drop should be taken into account in the computation of Equation
1 replacing V with V + V .
out
out
drop
5.1.2
Current control
The current loop is controlled via the second trans-conductance operational amplifier, the
sense resistor Rsense, and the optocoupler.
The control equation verifies:
Rsense x Ilim = Vsense
Rsense = Vsense / Ilim
Eq:2
Eq:2a
where Ilim is the desired limited current, and Vsense is the threshold voltage for the current
control loop. As an example, with Ilim = 1 A, Vsense = -200 mV, then Rsense = 200 mΩ.
Note that the Rsense resistor should be chosen taking into account the maximum
dissipation (Plim) through it during full load operation.
Plim = Vsense x Ilim.
Eq:3
As an example, with Ilim = 1 A, and Vsense = 200 mV, Plim = 200 mW.
Therefore, for most adaptor and battery charger applications, a quarter-watt, or half-watt
resistor to make the current sensing function is sufficient. Vsense threshold is achieved
internally by a voltage divider tied to the Vref voltage reference. Its middle point is tied to the
positive input of the current control operational amplifier, and its foot is to be connected to
lower potential point of the sense resistor as shown in Figure 3. The resistors of this voltage
divider are matched to provide the best precision possible. The current sinking outputs of
the two trans-conductance operational amplifiers are common (to the output of the IC). This
makes an ORing function which ensures that whenever the current or the voltage reaches
too high values, the optocoupler is activated. The relation between the controlled current
and the controlled output voltage can be described with a square characteristic as shown in
the following V/I output-power graph. (with power supply of the device indipendent from the
output voltage)
8/15
TSM1051
Application information
Figure 10. Output voltage versus output current
Vout
Voltage regulation
(Vcc of the device independent from output voltage) Iout
5.2
Compensation
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 Figure 3. It consists of a
capacitor Cvc1 = 2.2 nF and a resistor Rcv1 = 470 kΩ in series.
The current-control trans-conductance 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 3. It consists of a
capacitor Cic1 = 2.2 nF and a resistor Ric1 = 22 kΩ in series. In order to reduce the
dissipation of the device (especially with V voltage values close to 12 V) and to increase
CC
the stability of the application it is suggested to limit the current flowing in the OUT pin of the
device adding a resistor in series with the opto-coupler.
An example of a suitable R
value could be 330 Ω in series with the opto-coupler in case
LED
V
= 12 V.
CC
5.3
Start up and short circuit conditions
Under start-up or short-circuit conditions the device 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 device 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.
The following schematic shows how to realize a low-cost power supply for the device (with
no additional windings).
9/15
Application information
TSM1051
This solution allow a costant current regulation till output goes to 0 V.
Attention has to be payed to V of the device that cannot be higher than Absolute
CC
Maximum Rating.
Figure 11. Application circuit able to supply the device even with V
= 0
OUT
Vcc
TSM1051
R1
6
Rled
1.210 V
+
+
-
3
OUT
Rs
Ds
Rvc1
Cvc1
1
2
Vctrl
GND
Vout
200 mV
+
-
Cic1
Cs
R2
Ric1
4
5
Ictrl
Vsense
Ric2
Rsense
Iout
10/15
TSM1051
Package mechanical data
6
Package mechanical data
®
In order to meet environmental requirements, ST offers these devices in ECOPACK
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
11/15
Package mechanical data
TSM1051
Table 7.
Dim.
SOT23-6 mechanical data
mm.
Typ
inch
Typ
Min
Max
Min
Max
A
A1
A2
b
0.9
0
1.45
0.1
0.035
0
0.057
0.0039
0.0512
0.02
0.9
0.35
0.09
2.8
1.5
1.3
0.035
0.014
0.004
0.11
0.5
c
0.2
0.008
0.120
0.0689
D
E
3.05
1.75
0.059
e
0.95
0.037
H
L
2.6
0.1
0
3
0.102
0.004
0
0.118
0.024
10°
0.6
10°
θ
Note:
Dimensions per JEDEC MO178AB
Figure 12. Package dimensions
12/15
TSM1051
Package mechanical data
Table 8.
Dim.
SO-8 mechanical data
mm.
inch
Min
Typ
Max
Min
Typ
Max
A
A1
A2
B
1.35
0.1
1.75
0.25
1.65
0.51
0.25
5
0.053
0.004
0.043
0.013
0.007
0.189
0.150
0.000
0.228
0.010
0.016
0.069
0.010
0.065
0.020
0.010
0.197
0.157
0.000
0.244
0.020
0.050
1.1
0.33
0.19
4.8
C
D
E
3.8
4
e
1.27
0.050
H
5.8
0.25
0.4
6.2
0.5
h
L
1.27
k
8° (max.)
ddd
0.1
0.004
Figure 13. Package dimensions
13/15
Revision history
TSM1051
7
Revision history
Table 9.
Date
Document revision history
Revision
Changes
8-Jan-2002
18-Apr-2006
12-Feb-2008
1
2
3
Initial release.
New Template, few updates
Updated: Section 6: Package mechanical data on page 11
14/15
TSM1051
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15/15
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