MIC38C43 datasheet(5/24 Pages) MICROCHIP

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DS20006436B-page 5

MIC38C42/43/44/45

EQUATION 1-1:

Undervoltage Lockout

Start Threshold

VTH(ST)

13.5

14.5

15.5

MIC38C42/44

7.8

8.4

9.0

MIC38C43/45

Minimum Operating

Voltage

VDD(MIN)

MIC38C42/44

7.0

7.6

8.2

MIC38C43/45

Pulse Width Modulator

Maximum Duty Cycle

DMAX

—

MIC38C42/43

—

MIC38C44/45

Minimum Duty Cycle

DMIN

—

Total Standby Current

Start-Up Current

IDD(START)

—

200

µA

VDD = 13V for MIC38C42/44

VDD = 7.5V for MIC38C43/45

Operating Supply

Current

IDD(Q)

—

4.0

6.0

VFB = VISNS = 0V

Zener Voltage at VDD

—

IDD = 25 mA, Note 6

Note 1: Specification for packaged product only.

2: These parameters, although guaranteed, are not 100% tested in production.

3: Output frequency equals oscillator frequency for the MIC38C42 and MIC38C43. Output frequency for the

MIC38C44 and MIC38C45 equals one-half the oscillator frequency.

4: Parameter measured at trip point of latch with VFB = 0V.

5: Gain defined as Equation 1-1; 0V ≤ VTH(ISNS) ≤ 0.8V.

6: On the 8-pin version, 20V is the maximum input on Pin 7 because this is also the supply pin for the output

stage. On the 14-pin version, 40V is the maximum for Pin 12 and 20V is the maximum for Pin 11.

ELECTRICAL CHARACTERISTICS (CONTINUED)

Electrical Characteristics: VDD = 15V, Adjust VDD above the start threshold before setting at 15V; RT = 11.0 kΩ;

CT = 3.3 nF; –40°C ≤ TA ≤ +85°C; unless noted. Note 1

Parameter

Symbol

Min.

Typ.

Max.

Units

Conditions

ADIV

VCOMP



VTH ISNS







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