STV7778 datasheet(7/11 Pages) STMICROELECTRONICS

7 / 11 page

B+ SECTION

Operating Conditions

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

EAOI

Maximum Error Amplifier Output Current

Sourced by Pin 41

Sunk by Pin 41

0.5

FeedRes

Minimum Feedback Resistor

Resistor between Pins 40

and 41

Ω

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

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

OLG

Error Amplifier Open Loop Gain

At low frequency

(see Note 1)

UGBW

Unity Gain Bandwidth

(see Note 1)

MHz

IRI

Regulation Input Bias Current

Current sourced by Pin 40

(PNP base)

0.2

µA

EAOI

Maximum Guaranted Error Amplifier

Output Current

Current sourced by Pin 41

Current sink by Pin 41

0.5

CSG

Current Sense Input Voltage Gain

Pin 42

MCEth

Max Curent Sense Input Threshold Voltage

Pin 42

1.2

ISI

Current Sense Input Bias Current

Current sunk by Pin 42

(NPN base)

µA

Tonmax

Maximum External Power Transistor on Time

% of H-period,

@ f0 = 27kHz

B+OSV

B+ Output Low Level Saturation Voltage

V22 with I22 = 10mA

0.25

IVref

Internal Reference Voltage

On error amp (+) input for

V39 = 4V

4.9

VREFADJ

Internal Reference Voltage Adjustment

2V < V39 < 6V

±14

EAST WEST PARABOLA GENERATOR

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

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

Vsym

Parabola Symetry Adjustment Capability

(for Keystone Adjustment ; with Pin 38)

See Figure 2 ;

Internal voltage

V38 = 2V

V38 = 4V

V38 = 6V

3.2

3.5

3.8

Kadj

Keystone Adjustment Capability

B/A ratio

A/B ratio

See Figure 2 ; V37 = 4V

V38 = 2V

V38 = 6V

2.3

2.0

Paramp

Parabola Amplitude Adjustment Capability

Maximum Amplitude on Pin 36

Maximum Ratio between Max and Min

V38 = 4.3V, V28 = 2V

V37 = 2V

2V < V37 < 6V

3.3

2.4

3.8

4.3

STV7778S

7/11

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