MIC3808 Datasheet, PDF (5/11 Pages) Micrel Semiconductor – Push-Pull PWM Controller

MIC3808/3809
Micrel
Parameter
Condition
Min Typ Max Units
Undervoltage Lockout Section
Start Threshold
MIC3808, Note 9
MIC3809
11.5 12.5 13.5
V
4.1
4.3
4.5
V
Minimum Operating Voltage
After Start
MIC3808
MIC3809
7.6
8.3
9
V
3.9
4.1
4.3
V
Hysteresis
MIC3808
MIC3809
3.5
4.2
5.1
V
0.1
0.2
0.3
V
Soft Start Section
COMP Rise Time
FB = 1.8V, Rise from 0.5V to 3V
2.5
20
ms
Overall Section
Startup Current
Operating Supply Current
V_DD < Start Threshold
FB = 0V, CS = 0V, Notes 9 and 10
130 260
µA
1
2
mA
VDD Zener Shunt Voltage
I_DD = 10mA, Note 12
13
14
15
V
Note 1.
Note 2.
Note 3.
Note 4.
Note 5.
Note 6.
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Measured at RC. Signal amplitude tracks V_DD.
The COMP pin is internally clamped to 3.65V(typ). The COMP pin source current is tested at V_COMP = 3.0V to avoid interfering with this clamp
voltage. The minimum source current increases as V_COMP approaches V_CLAMP.
∆V_COMP
Gain is defined by A = _∆VCS , 0 ≤ V_CS ≤ 0.4V.
Note 7. Parameter measured at trip point of latch with FB at 0V.
Note 8. The internal current sink on the CS pin is designed to discharge an external filter capacitor. It is not intended to be a DC sink path.
Note 9. For MIC3808, set V_DD above the start threshold before setting at 10V.
Note 10. Does not include current in the external oscillator network.
Note 11. Maximum operating voltage is equal to the V_DD [zener] shunt voltage. When operating at or near the shunt voltage, care must be taken to limit
the V_DD pin current to less than the 20mA V_DD maximum supply current rating.
Note 12. Start threshold and Zener Shunt threshold track one another.
April 2005
5
MIC3808/3809