AIC1568 AIC [Analog Intergrations Corporation], AIC1568 Datasheet - Page 5

• Manufacturer Part Number: AIC1568
• Description: 4-bit DAC, Simple PWM Power Regulator
• Manufacturer: AIC [Analog Intergrations Corporation]

BLOCK DIAGRAM
PIN DESCRIPTIONS
PIN 1: OCSET - Current limit sense pin. Connect
PIN 2: SS
COMP
VID0
VID1
VID2
VID3
VSEN
SS
FB
REFERENCE
- Soft
4BITS
DAC
a resistor R
the
MOSFET. R
µA current source (I
the
resistance (R
over current trip point according
to the following equation:
If FB pin voltage is sensed to be
below
voltage reference VDAC, the
over current comparator cycles
the soft-start function.
capacitor from this pin to ground.
I
PEAK
1µA
4V
VDAC
=
drain
external
start
I
50%
OCSET
R
OCSET
OCSET
ERROR
DS(ON
DS(ON)
of
pin.
×
AMP
115%
110%
90%
of
50%
R
+
-
, an internal 200
MOSFET
OCSET
from this pin to
) jointly set the
)
the
the
Connect
OCSET
POWER GOOD
external
internal
OSCILLATOR
), and
+
+
= = -
+
+
= = -
-
-
OVP
on-
a
SOFT
SATRT
+
+
− − − −
PWM
COMPARATOR
POWER-ON
PIN 3: VID0
PIN 4: VID1
PIN 5: VID2
PIN 6: VID3
RESET
CONTROL
CURRENT
LOGIC
OVER
− − − −
+
-
-
-
- 4-bit DAC voltage select pin. TTL
An internal 10µA current source
provides soft start function for
the converter.
inputs used to set the internal
voltage reference VDAC. When
left
internally pulled up to 5V and
provide logic ones. The level of
VDAC sets the converter output
voltage as well as the PGOOD
and OVP thresholds.
Table 1 specifies the VDAC
voltage for the 16 combinations
of DAC inputs.
open,
I
200µA
OCSET
these
AIC1568
RT/OVP
VCC
UGATE
GND
PGOOD
OCSET
PHASE
BOOT
pins
5
are