TDA9109A datasheet(18/47 Pages) STMICROELECTRONICS

18 / 47 page

TDA9109A

18/47

B+ SECTION

Operating Conditions

Electrical Characteristics (VCC = 12V, Tamb =25°C)

Note: 20 0.5mA are sunk when B+ section is disabled. the purpose is to discharge the soft-start capacitor.

Note: 21 The external power transistor is OFF during 400ns of the HFOCUSCAP discharge

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Units

FeedRes

Minimum Feedback Resistor

Resistor between

Pins 15 and 14

Ω

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Units

OLG

Error Amplifier Open Loop Gain

At low frequency (15)85

UGBW

Unity Gain Bandwidth

(see 15)6

MHz

IRI

Regulation Input Bias Current

Current sourced by

Pin 15 (PNP base)

0.2

µA

EAOI

Error Amplifier Output Current

Current sourced by

Pin 14

Current sunk by Pin 14

(See 20)

1.4

CSG

Current Sense Input Voltage Gain

Pin 16

MCEth

Max Current Sense Input Threshold

Voltage

Pin 16

1.3

ISI

Current Sense Input Bias Current

Current sunk by Pin 16

(PNP base)

µA

Tonmax

Maximum ON Time of the external

power transistor

% of horizontal period

fo = 27kHz (See

21)

100

B+OSV

B+Output Saturation Voltage

V28 with I28 = 10mA

0.25

IVREF

Internal Reference Voltage

On error amp (+) input

for Subaddress OB

Byte 1000000

VREFADJ

Internal Reference Voltage Adjustment

Range

Byte 01111111

Byte 00000000

+20

-20

PWMSEL

Threshold for step-up/step-down

selection

Pin 16

tFB+

Fall Time

Pin 28

100

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