IRS2573D

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© 2009 International Rectifier

8

Electrical Characteristics

VCC = VB1S1 = VB2S2 = VBBSB = VBIAS = 14V +/- 0.25V, CLO1 = CLO2 = CIGN = CHO1 = CHO2 = BUCK =

1000pF, RIREF = 20kOhm, ROC = 10kOhm, ROV = 50kOhm, VRST = COM, CS = VSB, CT = TIGN = TCLK =

VSENSE = ISENSE = PCOMP = ICOMP = ZX = TOFF = COM, TA = 25C unless otherwise specified.

Symbol

Definition

Min

Typ

Max

Units

Test Conditions

Buck Control Characteristics

IPCOMP

SOURCE

OTA1 Error Amplifier Output Current

Sourcing

28

40

52

VPCOMP=7V

VVSENSE = VISENSE =

IPCOMP

SINK

OTA1 Error Amplifier Output Current Sinking

28

40

52

VPCOMP=7V

VVSENSE = VISENSE =

IICOMP

SOURCE

OTA2 Error Amplifier Output Current

Sourcing

28

40

52

VICOMP=7V

VISENSE =

IICOMP

SINK

OTA2 Error Amplifier Output Current Sinking

28

40

52

uA

VICOMP=7V

VISENSE =

VCOMPOH

OTA1,2 Error Amplifier Output Voltage

Swing (high state)

---

12.5

---

V

IPCOMP =

IPCOMP_SOURCE – 10uA,

or IICOMP =

IICOMP_SOURCE – 10uA

KMULT

Internal Multiplier Gain

---

2.0

---

VVSENSE =

VISENSE = 500mV

PSENSE

VVSENSE x VISENSE

0.465

0.50

0.535

VVSENSE = 1V

VISENSE = 500mV

VPCOMPTH

PCOMP pin buck on/off threshold voltage

---

0.2

---

VICOMP = 2V

VICOMPTH-

ICOMP pin buck off threshold voltage

---

0.2

---

VPCOMP = 2V

VICOMPTH+

ICOMP pin buck on threshold voltage

---

0.5

---

VPCOMP = 2V

VZX

ZX pin Comparator Threshold Voltage

---

2.0

---

V

VPCOMP = VICOMP = 7V

VZXhys

ZX pin Comparator Hysteresis

---

400

---

mV

VPCOMP = VICOMP = 7V

VZXclamp

ZX pin Clamp Voltage (high state)

---

6.5

---

V

IZX = 5mA

ITOFF

TOFF pin Output Current

91

110

129

uA

VBUCK = VSB

VTOFF

TOFF pin Comparator Threshold Voltage

1.93

2.05

2.17

V

VPCOMP = VICOMP = 7V

CTOFF = 1nF

Full-Bridge Oscillator Characteristics

fOSC

Full-Bridge oscillator frequency

160

200

240

Hz

d

Oscillator duty cycle

49

50

51

%

tdLO1,2

LO1, LO2 output deadtime

0.8

1.2

1.5

tdHO1,2

HO1, HO2 output deadtime

0.8

1.2

1.5

us

CCT = 47nF

VCT+

CT pin upper threshold voltage

---

4.0

---

VCT-

CT pin lower threshold voltage

---

2.0

---

V

ICT

SOURCE

CT pin sourcing current

---

80

---

VCT = 1.5V

ICT

SINK

CT pin sinking current

---

80

---

uA

VCT = 4.5V

Ignition Timer Characteristics

TIGNON

IGN pin on-time

18

21

24

TIGNOFF

IGN pin off-time

57

64

71

sec

CTIGN = 1uF

MODE = IGN

VTIGN+

TIGN pin upper threshold voltage

---

4.0

---

VTIGN-

TIGN pin lower threshold voltage

---

2.0

---

V

ITIGN

SOURCE

TIGN pin sourcing current

---

6

---

VTIGN = 1.5V

ITIGN

SINK

TIGN pin sinking current

---

6

---

uA

VTIGN = 4.5V