TS TS1052CX6 Schematic [ru]

SOT

-26

Pin

Definition

:

TS1052

Constant Voltage and Constant Current Controller

For Battery Chargers and Adaptors

CTRL

6. VCC

SENSE

CTRL

1. V

2. VND 5, V

3. Out 4. I

General Description

TS1052 is a highly integrated solution for SMPS applications requiring CV (constant voltage) and CC (constant
current) mode. TS1052 integrated one voltage reference, two operational amplifiers, and a current sensing circuit.
The voltage reference combined with one operational amplifier make it an ideal voltage controller, and the other
low voltage reference combined with the other operational amplifier make it an ideal current limiter for output low
side current sensing.
The current threshold is fixed, and precise. The only external components are:
* 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.
* A sense resistor having a value and allowable dissipation power which need to be chosen according to the

internal voltage threshold.

Features

● Constant Voltage and Constant Current Control

● Low Voltage Operation

● Precision Internal Voltage Reference

● Low External Component Count

● Current Sink Output Stage

● Easy Compensation

● Low AC Mains Voltage Rejection

Ordering Information

Part No. Package

TS1052CX6 RFG SOT-26 3Kpcs / 7” Reel

Note: “G” denotes for Halogen free products

Packing

Block Diagram

Application

● Battery Charger

● Adapters

Pin Function Description

Name Type Function

V

Analog Input Input Pin of the Voltage Control Loop

CTRL

VND Power Supply Ground Line. 0V Reference For All Voltage
Out Current Sink Output Output Pin. Sinking Current Only

I

Analog Input Input Pin of the Current Control Loop

CTRL

V

Analog Input Input Pin of the Current Control Loop

SENSE

VCC Power Supply Position Power Supply Line

1/8

Version: A12

TS1052

Constant Voltage and Constant Current Controller

For Battery Chargers and Adaptors

Absolute Maximum Rating

Parameter Symbol Value Unit

DC Supply Voltage VCC 20 V
Input Voltage VIN -0.3 to VCC V
Operating Temperature TOP 0 to +85
Maximum Junction Temperature Range TJ 150
Thermal Resistance Junction to Ambient Rθja 250

Operating Condition

Parameter Symbol Value Unit

DC Supply Voltage VCC 2.5 to 18 V

o

C/W

o

C

o

C

Electrical Specifications

(TA=25oC, VIN=5V unless otherwise noted)

Parameter Symbol Min Typ Max Unit

Total Current Consumption

Total Supply Current – not taking the output sinking
current into account

Voltage Control Loop

Trans-conduction Gain (Vctrl) sink Current Only (Note 1) GMW 1 3.5 -- mA/mV
Voltage Control Loop Reference (Note 2) V
Input Bias Current (Vctrl) I

Current Control Loop

Trans-conduction Gain (Ictrl) sink Current only (Note 3) GMI 1.5 7 -- mA/mV
Current Control Loop Reference, (Note 4) I
Current Out of Pin Ictrl at – 200mV I

Output Stage

Low Output Voltage at 10mA sinking Current VOL -- 200 -- mV
Output Short Circuit Current. Output to V
Only

Note 1: If the Voltage on Vctrl (the negative input of the amplifier) is higher than the positive amplifier input (Vref-

1.21V), and it is increased by 1mV, the sinking current at the output will be increased by 3.5mA.

Note 2: The internal Voltage reference is set at 1.21V (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.

Note 3: When the positive input at Ictrl is lower than -200mV, and the voltage is decreased by 1mV, the sinking

current at the output will be increased by 7mA

Note 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

=2.5A, V

OUT

Sink Current

CC.

ICC -- 1.1 2 mA

1.198 1.21 1.222 V

REF

-- 50 -- nA

IBV

196 200 204 mV

SENSE

-- 25 -- µA

IBI

IOS -- 27 50 mA

2/8

Version: A12

TS1052

Constant Voltage and Constant Current Controller

For Battery Chargers and Adaptors

Typical Adapter or Battery Charger Application Circuit

TS1052

* In the above application schematic, the TS1052 is used on the secondary side of a fly-back adapter (or battery
charger) to provide an accurate control of voltage and current. The above feedback loop is made with an

optocoupler.

Principle of Operation and Application Hints

Voltage Control

The voltage loop is controlled via a first trans-conductance operational amplifier, the resistor bridge R1, R2, and the
optocoupler which is directly connected to the output.
The relation between the values of R1 & R2 should be chosen as following:

*R1=R2 x Vref / (Vout-Vref)

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 & R2. As an example, with
R2=100KΩ, Vout=4.10V, Vref=1.21V, then R1=41.9KΩ.
Note that if the low drop diode should be inserted between the load and the voltage regulation resistor bridge to
avoid current flowing from the load through the resistor bridge, this drop should be taken into account into the
above calculations by replacing Vout by (Vout + Vdrop).

3/8

Version: A12