LESHAN RADIO COMPANY, LTD.

LR34063-2/12

LR34063

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Power Supply Voltage

VCC

40

Vdc

Comparator Input Voltage Range

VIR

– 0.3 to + 40

Vdc

Switch Collector Voltage

VC(switch)

40

Vdc

Switch Emitter Voltage (VPin 1 = 40 V)

VE(switch)

40

Vdc

Switch Collector to Emitter Voltage

VCE(switch)

40

Vdc

Driver Collector Voltage

VC(driver)

40

Vdc

Driver Collector Current (Note 1)

IC(driver)

100

mA

Switch Current

ISW

1.5

A

Power Dissipation and Thermal Characteristics

DIP-8

Package,

TA = 25°C

PD

1.25

W

Thermal Resistance

RθJA

100

°C/W

SOP-8 Package, D Suffix

TA = 25°C

PD

625

mW

Thermal Resistance

RθJA

160

°C/W

Operating Junction Temperature

TJ

+150

°C

Operating Ambient Temperature Range

TA

°C

0 to +70

Storage Temperature Range

Tstg

– 65 to +150

°C

NOTES: 1. Maximum package power dissipation limits must be observed.

Characteristics

Symbol

Min

Typ

Max

Unit

OSCILLATOR

Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25°C)

fosc

24

33

42

kHz

Charge Current (VCC = 5.0 V to 40 V, TA = 25°C)

Ichg

24

35

42

µA

Discharge Current (VCC = 5.0 V to 40 V, TA = 25°C)

Idischg

140

220

260

µA

Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25°C)

Idischg/Ichg

5.2

6.5

7.5

–

Current Limit Sense Voltage (Ichg = Idischg, TA = 25°C)

Vipk(sense)

250

300

350

mV

OUTPUT SWITCH (Note 3)

Saturation Voltage, Darlington Connection (Note 4)

(ISW = 1.0 A, Pins 1, 8 connected)

VCE(sat)

–

1.0

1.3

V

Saturation Voltage, Darlington Connection

(ISW = 1.0 A, RPin 8 = 82 Ω to VCC, Forced β ] 20)

VCE(sat)

–

0.45

0.7

V

DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25°C)

hFE

50

75

–

–

Collector Off–State Current (VCE = 40 V)

IC(off)

–

0.01

100

µA

NOTES: 2. Tlow = 0°C ,Thigh = +70°C

3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

4. If the output switch is driven into hard saturation (non–Darlington configuration) at low switch currents (

≤ 300 mA) and high driver currents (≥ 30 mA),

it may take up to 2.0

µs for it to come out of saturation. This condition will shorten the off time at frequencies ≥ 30 kHz, and is magnified at high

temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non–Darlington

configuration is used, the following output drive condition is recommended:

*The 100

Ω resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts.

Forced

b of output switch :

IC output

IC driver – 7.0 mA *

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