FC9911 datasheet(5/13 Pages) FS

5 / 13 page

FC9911

2012. 10. 31

5/13

Revision No : 0

Symbol

Parameter

Min

Typ Max Units Conditions

TDELAY2 Delay to output of

CLIMIT.comparator

180

ns COMP = VDD; CLIM = 300mV;

VCS = 0 to 400mV step

VOFFSET Comparator offset voltage

-10

mV ---

Internal Transconductance Opamp

Gain bandwidth product#

1.0

MHz 75pF capacitance at COMP pin

Open loop DC gain

dB Output Open

VCM

Input common-mode range#

-0.3

3.0

V ---

Output voltage range#

0.7

6.75

VDD = 7.75V

Transconductance

340

435

530

µA/V

---

VOFFSET Input offset voltage

-2.0

4.0

mV ---

IBIAS

Input bias current#

0.5

1.0

nA ---

Oscillator

fOSC1

Oscillator frequency*

100

112

kHz RT = 909kΩ

fOSC2

Oscillator frequency*

308

350

392

kHz RT = 261kΩ

DMAX

Maximum duty cycle

% ---

IOUTSYNC Sync output current

µA

---

IINSYNC Sync input current

200

µA

VSYNC < 0.1V

Output Short Circuit

TOFF

Propagation time for short

circuit detection

250

ns IREF = 200mV ; FDBK = 450mV;

FAULT goes from high to low

TRISE,FAULT Fault output rise time

300

ns 1nF capacitor at FAULT pin

TFALL,FAULT Fault output fall time

200

ns 1nF capacitor at FAULT pin

GFAULT Amplifier gain at IREF pin

1.8

2.2

IREF = 200mV

Soft Start

ICLIM

Current into CLIM pin when

pulled low

200

µA

FAULT is low; 06.25k resistor

between REF and CLIM

Slope Compensation

ISLOPE

Current sourced out of SC pin

100

µA

---

GSLOPE Internal current mirror ratio

1.8

2.2

ISLOPE = 50µA; RCSENSE= 1kΩ

1 See application section for minimum input voltage.

2 Parameters are not guaranteed to be within specifi cations if the external VDD voltage is greater than VDD(ext) or if VDD < 7.25V.

* Specifi cations which apply over the full operating ambient temperature range of -40°C < TA < +85°C.

# Guaranteed by design.

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