MIC38HC42 Datasheet, PDF (5/8 Pages) Micrel Semiconductor – BiCMOS 1A Current-Mode PWM Controllers

MIC38HC42/3/4/5
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) ‘HC’ High
R_DS(ON) ‘HC’ 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
10
Ω
5.5
Ω
20
50
ns
15
40
ns
Start Threshold
MIC38HC42/4
13.5 14.5 15.5
V
MIC38HC43/5
7.8
8.4
9.0
V
Minimum Operating Voltage
MIC38HC42/4
8
9
10
V
MIC38HC43/5
7.0
7.6
8.2
V
Pulse Width Modulator
Maximum Duty Cycle
MIC38HC42/3
94
96
%
MIC38HC44/5
46
50
%
Minimum Duty Cycle
0
%
Total Standby Current
Start-Up Current
V_DD = 13V, 38HC42/44
V_DD = 7.5V, 38HC43/45
50
200
µA
Operating Supply Current
V_FB = V_ISNS = 0V
4.0
6.0
mA
Zener Voltage (V_DD)
I_DD = 25mA, Note 6
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:
30
37
V
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 MIC38HC42 and MIC38HC43. Output frequency for the MIC38HC44, and
MIC38HC45 equals one half the oscillator frequency.
Note 6: On 8-pin version, 20V is maximum input on pin 7, as this is also the supply pin for the output stage. On 14-pin version, 40V is
maximum for pin 12 and 20V maximum for pin 11.
April 2005
5
M9999-042205