LM3450

SNVS681D – NOVEMBER 2010 – REVISED MAY 2013

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ELECTRICAL CHARACTERISTICS

(1)

Unless otherwise specified VCC = 14V. Specifications in standard type face are for TJ = 25°C and those with boldface type

apply over the full Operating Temperature Range ( TJ = −40°C to +125°C). Typical values represent the most likely

parametric norm at TA = TJ = +25°C, and are provided for reference purposes only.

Symbol

Parameter

Conditions

Min(2)

Typ(3)

Max(2)

Units

SUPPLY VOLTAGE INPUT (VCC)

VCC-RISE

Controller Enable Threshold

VCC Rising

12.2

13.0

13.6

V

VCC-FALL

Controller Disable Threshold

VCC falling

7.4

7.9

8.5

Glitch Filter Delay

9

µs

Turn-on Delay

40

IQ

VCC Quiescent Current

No Switching

1.6

mA

IQ-SD

VCC Shutdown Current

VFB = 0V

515

625

µA

ERROR AMPLIFIER & COMPENSATION (FB, COMP)

VFB

FB Reference (Normal Operation)

2.43

2.50

2.57

V

Input Bias Current

VFB = 2.5V

100

nA

GM

Transconductance

VFB =2.5V

69

115

161

µS

Output Source / Sink Capability

60

85

110

µA

FB Pull-up Current Source

VFB < 1.8V

43

51

59

COMP Pull-up Resistor

5

k

Ω

VCMP-B

COMP Low Threshold (Burst)

VCMP Falling

VTHM -0.08

V

COMP Low Hysteresis

20

VFB-SD

Low Threshold (Shutdown)

VFB Falling

150

168

186

FB Low Hysteresis

20

mV

VFB-EAD

FB Mid Threshold (EA Disabled)

VFB Falling

328

346

368

FB Mid Hysteresis

20

VFB-OV

FB High Threshold (Over-voltage)

1.20 x VFB

1.22 x VFB

V

COMP Pre-bias Source Current

VCMP= 0.5V

415

µA

VTHM

Minimum COMP Voltage (Normal)

1.47

V

ANGLE DEMODULATION & MULTIPLIER (COMP, VAC)

VAC-DET

VAC Angle Detection Threshold

334

356

378

mV

Angle Demodulation Delay Time

Both edges

8

µs

VAC Dynamic Input Voltage Range

0 to 5.5

V

COMP Dynamic Input Voltage Range

VTHM to

VTHM+2

VAC Input Impedance

500

k

Ω

KM

Multiplier Gain (Includes Internal

VAC = 3V, VCMP =

0.5

1/V

Resistor Divider)

VTHM+1.5V

ZERO CURRENT DETECTOR (ZCD)

VZCD-RIS

ZCD Input Threshold

VZCORising

1.45

1.5

1.55

V

Hysteresis

150

200

250

mV

Delay to Output

135

ns

VZCD-H

Positive Clamp Voltage

IZCO = 1mA

6.0

V

VZCD-L

Negative Clamp Voltage

IZCO = –50µA

0.61

PWM COMPARATOR (CS)

VOS

PWM Comparator Input Offset Voltage

30

mV

(1)

Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Operating Ratings are conditions under

which operation of the device is specified and do not imply ensured performance limits. For specified performance limits and associated

test conditions, see the Electrical Characteristics table. All voltages are with respect to the potential at the GND pin, unless otherwise

specified.

(2)

All limits specified at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are

100% production tested. All limits at temperature extremes are specified via correlation using standard Statistical Quality Control (SQC)

methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).

(3)

Typical numbers are at 25°C and represent the most likely norm.

4

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