SI9140CQ VISHAY [Vishay Siliconix], SI9140CQ Datasheet - Page 8

• Manufacturer Part Number: SI9140CQ
• Description: SMP Controller For High Performance Process Power Supplies
• Manufacturer: VISHAY [Vishay Siliconix]

Si9140
Vishay Siliconix
S-58034—Rev. G, 15-Mar-99
8
Pin 10: R
A resistor connected from this pin to ground sets the
oscillator’s capacitor C
See the oscillator section of the description of operation.
Pin 11: C
An external capacitor is connected to this pin to set the
oscillator frequency.
Pin 12: UVLO
This pin will place the chip in the standby mode if the
UVLO
voltage exceeds 1.2 V, the chip operates normally. There is a
built-in hysteresis of 165 mV.
FUNCTIONAL BLOCK DIAGRAM
f
OSC
SET
----------------------------------- -
R
OSC
OSC
voltage drops below 1.2 V. Once the UVLO
OSC
0.75
SET
C
OSC
OSC
, charge and discharge current.
(at V
DD
=
5.0 V)
SET
Pin 13: P
The negative return for the V
Pin 14: D
This CMOS push-pull output pin drives the external p-channel
MOSFET. This pin will be high in the standby mode. A
break-before-make function between D
Pin 15: D
This CMOS push-pull output pin drives the external n-channel
MOSFET.
break-before-make function between the D
Pin 16: V
The positive terminal of the power supply which powers the
CMOS output drivers. A bypass capacitor is required.
GND
S
S
R
This pin will be low in the standby mode.
FaxBack 408-970-5600, request 70026
S
supply.
S
and D
S
www.siliconix.com
and D
R
is built-in.
R
is built-in.
A