MIC38C42A Datasheet, PDF (5/9 Pages) Micrel Semiconductor – BiCMOS Current-Mode PWM Controllers

MIC38C42A/43A/44A/45A
Micrel, Inc.
Parameter
Test Conditions
Min Typ Max Units
Current Sense
Gain
Notes 2, 3
2.85 3.0 3.15 V/V
MaximumThreshold
PSRR
Input Bias Current
V_COMP = 5V, Note 2
12 ≤ V_DD ≤ 18V, Note 2
0.9
1
1.1
V
70
dB
–0.1 –2
µA
Delay to Output
120 250
ns
Output
R_DS(ON) High
R_DS(ON) Low
Rise Time
Fall Time
Undervoltage Lockout
I_SOURCE = 200mA
I_SINK = 200mA
T_A = 25°C, C_L = 1nF
T_A = 25°C, C_L = 1nF
20
Ω
11
Ω
40
80
ns
30
60
ns
Start Threshold
MIC38C42A/4A
13.5 14.5 15.5
V
MIC38C43A/5A
7.8
8.4
9.0
V
Minimum Operating Voltage
MIC38C42A/4A
8
9
10
V
MIC38C43A/5A
7.0
7.6
8.2
V
Pulse Width Modulator
Maximum Duty Cycle
MIC38C42A/3A
94
96
%
MIC38C44A/5A
46
50
%
Minimum Duty Cycle
0
%
Total Standby Current
Start-Up Current
V_DD = 13V for MIC38C42A/44A
V_DD = 7.5V for MIC38C43A/45A
100 230
µA
Operating Supply Current
V_FB = V_ISNS = 0V
4.0
6.0
mA
Note 1: These parameters, although guaranteed, are not 100% tested in production.
Note 2: Parameter measured at trip point of latch with V_EA = 0.
Note 3: Gain defined as:
A=
∆ V_{PIN1 ;}
V_TH (I_SNS )
0
≤
V_TH (I_SNS )
≤
0.8V
Note 4: Adjust V_DD above the start threshold before setting at 15V.
Note 5: Output frequency equals oscillator frequency for the MIC38C42 and MIC38C43. Output frequency for the MIC38C44A, and
MIC38C45A equals one half the oscillator frequency.
Note 6: Specification for packaged product only.
April 2005
5
M9999-042205