TK73211 查看數據表（PDF） - Toko America Inc

零件编号

产品描述 (功能)

生产厂家

TK73211

LOW DROPOUT REGULATOR

Toko America Inc  

TK732xx

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

OUTPUT VOLTAGE (VOUT)

The output voltage is specified with VIN = (VOUT(TYP) + 1 V)

and IOUT = 30 mA.

DROPOUT VOLTAGE (VDROP)

The dropout voltage is the difference between the input

voltage and the output voltage at which point the regulator

starts to fall out of regulation. Below this value, the output

voltage will fall as the input voltage is reduced. It is

dependent upon the load current, the external transistor

and the junction temperature.

BASE CONTROL CURRENT (IBASE)

The base control current is the drive current for the base of

the external transistor.

OUTPUT CURRENT (IOUT)

The output current depends on the characteristics of the

external transistor and current limit setting.

LINE REGULATION (Line Reg)

RIPPLE REJECTION RATIO (RR)

Ripple rejection is the ability of the regulator to attenuate

the ripple content of the input voltage at the output. It is

specified with 100 mVrms, 400 Hz superimposed on the

input voltage, where VIN = VOUT(TYP) + 1.5 V. The output

decoupling capacitor is set to 10 µF, the noise bypass

capacitor is set to 0.1 µF, and the load current is set to

30 mA. Ripple rejection is the ratio of the ripple content of

the output vs. the input and is expressed in dB.

STANDBY CURRENT (ISTBY)

Standby current is the current which flows into the regulator

when the output is turned off by the control function

(VCONT = 0 V). It is measured with VIN = 8 V (9 V for the

8 V output device).

REMOTE SENSING (VSENSE)

The VSENSE pin is the output voltage sensing pin. If the

voltage drop to the load caused by the PCB etch resistance

cannot be disregarded, the voltage drop can be

compensated by connecting the VSENSE pin as shown

below.

Line regulation is the ability of the regulator to maintain a

constant output voltage as the input voltage changes. The

line regulation is specified as the input voltage is changed

from VIN = VOUT(TYP) + 1 V to VIN = VOUT(TYP) + 6 V.

LOAD REGULATION (Load Reg)

COLLECTOR

EXTERNAL

TRANSISTOR

EMITTER

BASE

VOUT

Load regulation is the ability of the regulator to maintain a

constant output voltage as the load current changes. It is

a pulsed measurement to minimize temperature effects.

Load regulation depends on the external transistor.

RIPK

CL

TK732XX

QUIESCENT CURRENT (IQ)

The quiescent current is the current which flows through

the ground terminal under no load conditions (IOUT = 0 mA)

and excludes the control pin current.

The length of the VSENSE etch should be limited to 30 cm

(11.8 in.) maximum.

GROUND CURRENT (IGND)

Ground current is the current which flows through the

ground pin(s). It is defined as IIN - IOUT, excluding control

current.

January 1999 TOKO, Inc.

Page 9

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