High-Voltage PWM

Power-Supply Controller

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3

ELECTRICAL CHARACTERISTICS (continued)

(Note 2)

From end of blanking time 25mV overdrive

10.8V and 18.75V

At COMP

At COMP

kHz

200

1200

FREQ Range

µs

813

External Oscillator Maximum

Low Time

µA

1

FREQ Output Low

V

2.7

FREQ Input High

V

0.8

FREQ Input Low

µA

-1

0.01

+1

INDIV Bias Current

mV

125

INDIV Hysteresis

1.23

1.32

1.45

V

1.15

1.20

1.25

INDIV Undervoltage Lockout

ppm/°C

100

µA

-1

0.1

+1

FB Bias Current

ns

70

CS Blanking Time

ns

240

µA

-1

+1

CS Input Bias Current

Overcurrent Delay

V

1.448

1.485

1.522

FB Regulation Voltage

V

3.00

Output Clamp High

V

0.25

Output Clamp Low

dB

60

80

Voltage Gain

MHz

1.2

BW

Unity-Gain Bandwidth

degrees

65

φ

Phase Margin

ns

150

FREQ HI/LO Pulse Width

kHz

50

300

Frequency Range

CONDITIONS

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETERS

µA

1

FREQ Output Current Low

µA

300

FREQ Output Current High

kHz

80

100

120

Oscillator Frequency

k

Ω

50

500

FREQ Resistor Range

%

75

Maximum Programmable

Duty Cycle

mV

80

100

120

CS Threshold Voltage

MAXIMUM DUTY CYCLE (MAXTON)

MAIN OSCILLATOR—INTERNAL MODE

MAIN OSCILLATOR—EXTERNAL MODE

UNDERVOLTAGE LOCKOUT

FEEDBACK INPUT AND SET POINT

ERROR AMPLIFIER

CURRENT LIMIT