4-104

TELCOM SEMICONDUCTOR, INC.

Current Sense Section

Amplifier Gain

(Notes 2, 3)

2.7

3

3.6

2.7

3

3.4

V/V

Max Differential

(Note 2)

1.1

1.5

1.8

1.1

1.5

1.8

V

Input Offset Voltage

(Note 2)

0.4

0.65

0.85

0.4

0.65

0.85

V

CMRR

40

60

—

40

60

—

dB

PSRR

40

60

—

40

60

—

dB

Input Bias Current

(Note 1)

—

±1

±100

—

±1

±100

nA

Input Offset Current

(Note 1)

—

±0.1

±2—

±0.1

±2nA

Input Common Mode Range

(Note 1)

0

—

11

0

—

11

V

Delay to Outputs

150

225

400

150

225

400

nsec

Current Limit Adjust Section

Current Limit Voltage Offset

—

±1

±25

—

±1

±25

mV

Input Impedance

(Shutdown Unlatched)

3

3.5

4

3

3.5

4

k

Ω

Shutdown Terminal Section

Threshold Voltage

320

360

400

320

360

400

mV

Input Voltage Range

(Note 1)

0

—

0

—

V

Min Latching

(Note 4)

140

—

—

140

—

—

µA

Max Non-Latching

(Note 5)

—

—

60

—

—

65

µA

Min Pulse Width

(Note 1)

100

50

—

100

50

—

nsec

Delay to Outputs

(Note 1)

125

250

400

125

250

400

nsec

Output Section

—

10

20

—

10

20

Ω

—

20

35

—

20

35

Ω

Output Rise Time

—

55

90

—

55

90

nsec

Output Fall Time

—

55

90

—

55

90

nsec

Undervoltage Lockout Section

Undervoltage Threshold

6.5

7

7.3

6.5

7

7.3

V

Start Threshold

7.4

7.8

8

7.4

7.8

8

V

Threshold Hysteresis

0.6

0.8

1

0.6

0.8

1

V

Total Standby Current

Supply Current

—

1.2

2.5

—

1.2

2

mA

Start-Up Current

—

250

350

—

250

350

µA

TC18C46

TC28C46

TC38C46

Parameter

Test Conditions

Min

Typ

Max

Min

Typ

Max

Units

NOTES: 1. These parameters, although guaranteed over the

recommended operating conditions, are not tested in

production.

3. Amplifier gain is defined as:

4. Current into Pin 1 guaranteed to latch circuit in shutdown

state.

5. Current into Pin 1 guaranteed not to latch circuit in

shutdown state.

CMOS CURRENT MODE

PWM CONTROLLERS

TC18C46

TC28C46

TC38C46

G = ∆

VPin 7

;

∆VPin 4 = 0V to 1V

∆VPin 4