CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER

FOR ADATPTORS AND BATTERY CHARGERS

ELECTRICAL CHARACTERISTICS

Tamb = 25

2)

4)

Current

Vcc. Sink Current Only

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

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.

Jan. 2007-Rev 1.0

HTC

3

Min

Unit

Typ

Max

TJ1051

7

mA/mV

100

Current Control Loop

0 < Tamb < 85

℃

Gmi

1.5

0 < Tamb < 85

℃

㎂

mV

200

50

mA

50

27

35

Ios

Tamb

0 < Tamb < 85

℃

Output Short Circuit Current. Output to

Output Stage

Vol

Low output voltage at 10 mA sinking

Tamb

200

mV

0 < Tamb < 85

℃

Symbol

mA/mV

V

3.5

2.5

1.198

1.186

1.222

1

Tamb

Total Supply Current - not taking the

output sinking current into account

0 < Tamb < 85

℃

Current out of pin Ictrl at - 200mV

Transconduction Gain (Ictrl). Sink

Input Bias Current (Vctrl)

196

204

192

208

25

Voltage Control Loop Referenc

nA

1.21

50

1.234

0 < Tamb < 85

℃

Tamb

Tamb

Iibi

Iout =2.5mA Tamb

0 < Tamb < 85

℃

Parameter

Test Condition

mA

2

Total Current Consumption

1.1

1.2

Icc

Voltage Control Loop

Gmv

Vref

Iibv

Tamb

0 < Tamb < 85

℃

Tamb

Tamb

Transconduction Gain (Vctrl). Sink

0 < Tamb < 85

℃