AIC1569 AIC [Analog Intergrations Corporation], AIC1569 Datasheet - Page 5

• Manufacturer Part Number: AIC1569
• Description: 5-bit DAC, Synchronous PWM Power Regulator
• Manufacturer: AIC [Analog Intergrations Corporation]

BLOCK DIAGRAM
PIN DESCRIPTIONS
PIN 1: VSEN - Converter output voltage sense
PIN 2:OCSET - Current limit sense pin. Connect a
COMP
VSEN
VID0
VID1
VID2
VID3
VID4
FB
SS
REFERENCE
5-BITS DAC
pin. Connect this pin to the
converter output. The PGOOD
and OVP comparator circuits use
this signal to report output voltage
status and perform overvoltage
protection function.
resistor R
drain of the external MOSFET.
R
source (I
MOSFET on-resistance (R
jointly set the over current
point according to the following
OCSET
10µA
4V
VDAC
, an internal 200µA current
OCSET
OCS
), and the external
ERROR AMP
from this pin to the
115%
110%
90%
50%
+
−
POWER GOOD
+
−
+
−
+
−
+
−
DS(ON)
OSCILLATOR
OVP
trip
COMPARATOR
)
START
SOFT
PWM
+
−
POWER-ON
PIN 3:SS
RESET
CONTROL
OVER
CURRENT
LOGIC
+
−
- Soft start pin. Connect a capacitor
equation:
If FB pin voltage is sensed to be
below 50% of the internal voltage
reference VDAC, the over current
comparator cycles the soft-start
function.
from this pin to ground. An internal
10µA current source provides soft
start function for the converter.
I
PEAK
VCC
=
I
OCS
I
200µA
R
OCS
DS ON
×
R
(
AIC1569A
OCSET
)
VCC
OVP
PGOOD
OCSET
PHASE
BOOT
UGATE
GND
LGATE
PGND
RT
5