TSM1051D [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：	TSM1051D
厂家：	ST
描述：	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电池控制器
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TSM1051

CONSTANT VOLTAGE AND CONSTANT CURRENT

CONTROLLER FOR BATTERY CHARGERS AND ADAPTORS

■ CONSTANT VOLTAGE AND CONSTANT

ORDER CODE

Part Number

CURRENT CONTROL

Package

Temperature

Range

■ LOW VOLTAGE OPERATION

Marking

■ PRECISION INTERNAL VOLTAGE

REFERENCE

TSM1051CLT

0 to 85°C

•

M801

■ LOW EXTERNAL COMPONENT COUNT

■ CURRENT SINK OUTPUT STAGE

■ EASY COMPENSATION

TSM1051CD

•

M1051C

L = Tiny Package (SOT23-6) - only available in Tape & Reel (LT)

D = Small Outline Package (SO) - also available in Tape & Reel (DT)

■ LOW AC MAINS VOLTAGE REJECTION

DESCRIPTION

TSM1051 is a highly integrated solution for SMPS

applications requiring CV (constant voltage) and

CC (constant current) mode.

TSM1051 integrates one voltage reference, two

operational amplifiers (with ORed outputs -

common collectors), and a current sensing circuit.

The voltage reference combined with one

operational amplifier makes it an ideal voltage

controller, and the other low voltage reference

combined with the other operational amplifier

makes it an ideal current limiter for output low side

current sensing.

SO8

SOT23-6

(Plastic Package)

(Plastic Micro package)

The current threshold is fixed, and precise.

The only external components are:

PIN CONNECTIONS (top view)

* a resistor bridge to be connected to the output of

the power supply (adapter, battery charger) to set

the voltage regulation by dividing the desired

output voltage to match the internal voltage

reference value.

SOT23-6

SO8

* a sense resistor having a value and allowable

dissipation power which need to be chosen

according to the internal voltage threshold.

Vctrl

Vcc

Vctrl

Vcc

Gnd

Out

Ictrl

Gnd Vsense

* optional compensation components (R and C).

TSM1051, housed in one of the smallest package

available, is ideal for space shrinked applications

such as adapters and battery chargers.

Out

Ictrl

Vsense

APPLICATIONS

■ ADAPTERS

■ BATTERY CHARGERS

January 2002

1/9

TSM1051

PIN DESCRIPTION

SOT23-6 Pinout

Name

Pin #

Type

Function

Vcc

Gnd

Power Supply

Analog Input

Positive Power Supply Line

Ground Line. 0V Reference For All Voltages

Input Pin of the Voltage Control Loop

Input Pin of the Current Control Loop

Vctrl

Ictrl

Out

Current Sink Output Output Pin. Sinking Current Only

Vsense

Analog Input

Input Pin of the Current Control Loop

SO8 Pinout

Name

Pin #

Type

Function

Vcc

Gnd

Vctrl

Ictrl

Power Supply

Analog Input

Positive Power Supply Line

Ground Line. 0V Reference For All Voltages

Input Pin of the Voltage Control Loop

Input Pin of the Current Control Loop

Out

Current Sink Output Output Pin. Sinking Current Only

Analog Input Input Pin of the Current Control Loop

Vsense

ABSOLUTE MAXIMUM RATINGS

Symbol

DC Supply Voltage

Value

Unit

Vcc

DC Supply Voltage

Input Voltage

-0.3 to Vcc

0 to 85

150

Top

Operating Free Air Temperature Range

°C

Maximum Junction Temperature

°C

Rthja

Thermal Resistance Junction to Ambient SO8 package

Thermal Resistance Junction to Ambient SOT23-6 package

130

°C/W

250

2/9

TSM1051

OPERATING CONDITIONS

Symbol

Parameter

Value

Unit

Vcc

DC Supply Conditions

2.5 to 12

ELECTRICAL CHARACTERISTICS

Tamb = 25°C and Vcc = +5V (unless otherwise specified)

Symbol

Total Current Consumption

Icc Total Supply Current - not taking the

Parameter

Test Condition

Min

Typ

Max

Unit

Tamb

1.1

1.2

output sinking current into account

0 < Tamb < 85°C

Voltage Control Loop

Gmv

Transconduction Gain (Vctrl). Sink

Current Only

Tamb

3.5

2.5

mA/mV

0 < Tamb < 85°C

Vref

Iibv

Tamb

0 < Tamb < 85°C

1.198

1.186

1.21

1.222

1.234

Voltage Control Loop Reference

Input Bias Current (Vctrl)

Tamb

0 < Tamb < 85°C

100

Current Control Loop

Gmi

Transconduction Gain (Ictrl). Sink

Current Only

Tamb

1.5

mA/mV

0 < Tamb < 85°C

Vsense

Iibi

Iout = 2.5mA Tamb

0 < Tamb < 85°C

196

192

200

204

208

Current Control Loop Reference

Current out of pin ICTRL at -200mV

Tamb

0 < Tamb < 85°C

µA

Output Stage

Vol

Low output voltage at 10 mA sinking

current

Tamb

0 < Tamb < 85°C

200

Ios

Output Short Circuit Current. Output to Tamb

Vcc. Sink Current Only 0 < Tamb < 85°C

1. If the voltage on VCTRL (the negative input of the amplifier) is higher than the positive amplifier input (Vref=1.210V), and it is increased

by 1mV, the sinking current at the output OUT will be increased by 3.5mA.

2. The internal Voltage Reference is set at 1.210V (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 -200mV, and the voltage is decreased by 1mV, the sinking current at the output OUT will

be increased by 7mA.

4. The internal current sense threshold is set to -200mV. 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.

3/9

TSM1051

Figure 1 : Internal Schematic

Vcc

1.210V

Out

200mV

Ictrl

Gnd

Vsense

Figure 2 : Typical Adapter or Battery Charger Application Using TSM1051

OUT+

To primary

TSM1051

Vcc

Rout

1.210V

Out

Cvc1

Rvc1

470K

Cvc2

22pF

2.2nF

Cic1

2.2nF

200mV

Ictrl

Gnd

Ric1

22K

Vsense

Ric2

500

Vsense

Rsense

OUT-

In the above application schematic, the TSM1051 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.

4/9

TSM1051

Figure 3 : Vref vs Ambient Temperature

Figure 6 : Vsense vs Ambient Temperature

1,230

1,225

203,5

203,0

202,5

202,0

201,5

201,0

200,5

Vcc=5V

2,5V Vcc 12V

≤

1,220

1,215

1,210

1,205

1,200

Vcc=2,5V

Vcc=12V

100

120

100 120

Ta ambient temperature (°C)

Figure 4 : Vsense pin input bias current vs

Ambient Temperature

Figure 7 : Ictrl pin input bias current vs

Ambient Temperature

120

100

Vcc=2,5V

Vcc=12V

Vcc=5V

Vcc=12V

Vcc=2,5V

Vcc=5V

Victrl=200mV

100

120

100

120

Ta ambient temperature (°C)

Figure 5 : Output short circuit current vs

Ambient Temperature

Figure 8 : Supply current vs Ambient

Temperature

1,6

Vcc=12V

1,4

Vcc=5V

1,2

1,0

0,8

0,6

0,4

0,2

0,0

Vcc=12V

Vcc=5V

Vcc=2,5V

100

120

100

120

Ta ambient temperature (°C)

5/9

TSM1051

PRINCIPLE OF OPERATION AND APPLICATION HINTS

1. Voltage and Current Control

Vsense threshold is achieved internally by a re-

sistor bridge tied to the Vref voltage reference. Its

middle point is tied to the positive input of the cur-

rent control operational amplifier, and its foot is to

be connected to lower potential point of the sense

resistor as shown on the following figure. The re-

sistors of this bridge are matched to provide the

best precision possible.

The current sinking outputs of the two trans-con-

ductance operational amplifiers are common (to

the output of the IC). This makes an ORing func-

tion which ensures that whenever the current or

the voltage reaches too high values, the optocou-

pler is activated.

1.1. Voltage Control

The voltage loop is controlled via a first transcon-

ductance operational amplifier, the resistor bridge

R1, R2, and the optocoupler which is directly con-

nected to the output.

The relation between the values of R1 and R2

should be chosen as written in Equation 1.

R1 = R2 x Vref / (Vout - Vref)

Eq1

Where Vout is the desired output voltage.

To avoid the discharge of the load, the resistor

bridge R1, R2 should be highly resistive. For this

type of application, a total value of 100KΩ (or

more) would be appropriate for the resistors R1

and R2.

The relation between the controlled current and

the controlled output voltage can be described

with a square characteristic as shown in the fol-

lowing V/I output-power graph.

As an example, with R2 = 100KΩ, Vout = 4.10V,

Vref = 1.210V, then R1 = 41.9KΩ.

Note that if the low drop diode should be inserted

between the load and the voltage regulation resis-

tor bridge to avoid current flowing from the load

through the resistor bridge, this drop should be

taken into account in the above calculations by re-

placing Vout by (Vout + Vdrop).

Figure 9 : Output voltage versus output current

Vout

Voltage regulation

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

where Ilim is the desired limited current, and

Vsense is the threshold voltage for the current

control loop.

eq2

eq2’

TSM1051 Vcc : independent power supply

Iout

Secondary current regulation

TSM1051 Vcc : On power output

Primary current regulation

As an example, with Ilim = 1A, Vsense = -200mV,

then Rsense = 200mΩ.

Note that the Rsense resistor should be chosen

taking into account the maximum dissipation

(Plim) through it during full load operation.

2. Compensation

The voltage-control trans-conductance operation-

al amplifier can be fully compensated. Both of its

output and negative input are directly accessible

for external compensation components.

Plim = Vsense x Ilim.

eq3

As an example, with Ilim = 1A, and Vsense =

200mV, Plim = 200mW.

Therefore, for most adapter and battery charger

applications, a quarter-watt, or half-watt resistor to

make the current sensing function is sufficient.

An example of a suitable compensation network is

shown in Fig.2. It consists of a capacitor

Cvc1=2.2nF and a resistor Rcv1=470KΩ in series,

6/9

TSM1051

connected in parallel with another capacitor

Cvc2=22pF.

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.

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=22KΩ in series.

If the primary current limitation is considered not to

be precise enough for the application, then a suffi-

cient supply for the TSM1051 has to be ensured

under any condition. It would then be necessary

to add some circuitry to supply the chip with a sep-

arate power line. This can be achieved in numer-

ous ways, including an additional winding on the

transformer.

When the Vcc voltage reaches 12V it could be in-

teresting to limit the current coming through the

output in the aim to reduce the dissipation of the

device and increase the stability performances of

the whole application.

An example of a suitable Rout value could be

330Ω in series with the opto-coupler in case

Vcc=12V.

The following schematic shows how to realize a

low-cost power supply for the TSM1051 (with no

additional windings).

Please pay attention to the fact that in the particu-

lar case presented here, this low-cost power sup-

ply can reach voltages as high as twice the volt-

age of the regulated line. Since the Absolute Max-

imum Rating of the TSM1051 supply voltage is 14

V, this low-cost auxiliary power supply can only be

used in applications where the regulated line volt-

age does not exceed 7 V.

3. Start Up and Short Circuit Conditions

Under start-up or short-circuit conditions the

TSM1051 is not provided with a high enough sup-

ply voltage. This is due to the fact that the chip has

Figure 10 :

Vcc

OUT+

To primary

TSM105

Vcc

Rout

1.210V

Out

Cvc1

Rvc1

470K

Cvc2

2.2nF

22pF

Cic1

2.2nF

200mV

Ictrl

Gnd

Ric1

22K

Vsense

Ric2

500

Vsense

OUT-

Rsense

7/9

TSM1051

PACKAGE MECHANICAL DATA

6 PINS - PLASTIC PACKAGE SOT23-6

Millimeters

Dimensions

Inches

Typ.

Min.

Typ.

Max.

Min.

Max.

0.9

1.45

0.15

1.3

0.5

0.2

0.035

0.057

0.006

0.0512

0.02

0.9

0.35

0.09

2.8

1.5

0.035

0.0137

0.004

0.11

0.008

0.118

0.0689

1.75

0.059

0.95

0.0374

2.6

0.1

0.102

0.004

0.118

0.024

0.6

10 deg.

8/9

TSM1051

PACKAGE MECHANICAL DATA

8 PINS - PLASTIC MICROPACKAGE (SO8)

Millimeters

Dim.

Inches

Typ.

Min.

Typ.

Max.

Min.

Max.

1.75

0.25

1.65

0.85

0.48

0.25

0.5

0.069

0.010

0.065

0.033

0.019

0.010

0.020

0.1

0.004

0.65

0.35

0.19

0.25

0.026

0.014

0.007

0.010

45° (typ.)

4.8

5.8

5.0

6.2

0.189

0.228

0.197

0.244

1.27

3.81

0.050

0.150

3.8

0.4

4.0

1.27

0.6

0.150

0.016

0.157

0.050

0.024

8° (max.)

Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the

consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from

its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications

mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information

previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or

systems without express written approval of STMicroelectronics.

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9/9

TSM1051D [STMICROELECTRONICS]

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