ADP1043A Analog Devices, ADP1043A Datasheet - Page 9

• Manufacturer Part Number: ADP1043A
• Description: Digital Controller for Isolated Power Supply Applications
• Manufacturer: Analog Devices

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Table 4. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
AGND
OUTA
OUTB
OUTC
OUTD
Mnemonic
VS2
VS1
CS2−
CS2+
ACSNS
CS1
PGND
SR1
SR2
OUTAUX
GATE
SCL
SDA
Description
Power Supply Output Sense Input. This signal is referred to PGND. Input to a low frequency Σ-Δ ADC. Nominal
voltage at this pin should be 1 V. The resistor divider on this input must have a tolerance specification of 0.5%
or better to allow for trimming.
Analog Ground. This pin is the ground for the analog circuitry of the ADP1043A. Star connect to DGND.
Local Voltage Sense Input. This signal is referred to PGND. Input to a high frequency Σ-Δ ADC. Nominal voltage
at this pin should be 1 V. The resistor divider on this input must have a tolerance specification of 0.5% or
better to allow for trimming.
Inverting Differential Current Sense Input. Nominal voltage at this pin should be 1 V for best operation. When
using high-side current sensing in a 12 V application, place a 110 kΩ resistor between the sense resistor and
this pin. When using low-side current sensing, place a 10 kΩ resistor between the sense resistor and this pin.
When using high-side current sensing, use the formula R = (V
used to connect this circuit.
Noninverting Differential Current Sense Input. Nominal voltage at this pin should be 1 V for best operation.
When using high-side current sensing in a 12 V application, place a 110 kΩ resistor between the sense resistor
and this pin. When using low-side current sensing, place a 10 kΩ resistor between the sense resistor and this
pin. When using high-side current sensing, use the formula R = (V
be used to connect this circuit.
AC Sense Input. This input is connected upstream of the main inductor through a resistor divider network.
The nominal voltage for this circuit is 0.45 V. This signal is referred to PGND.
Primary Side Current Sense Input. This pin is the current transformer input to measure and control the primary
side current. This signal is referred to PGND. The resistors on this input must have a tolerance specification of
0.5% or better to allow for trimming.
Power Ground. This pin is the ground connection for the main power rail of the power supply. Star connect
to AGND.
Synchronous Rectifier Output. This PWM output connects to the input of a FET driver. This pin can be disabled
when not in use. This signal is referred to AGND.
Synchronous Rectifier Output. This PWM output connects to the input of a FET driver. This pin can be disabled
when not in use. This signal is referred to AGND.
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referred to AGND.
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referred to AGND.
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referred to AGND.
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referred to AGND.
Auxiliary PWM Output. This pin can be disabled when not in use. This signal is referred to AGND.
OrFET Gate Drive Output (Open Drain). This signal is referred to AGND.
I
I
2
2
C Serial Clock Input. This signal is referred to AGND.
C Serial Data Input and Output (Open Drain). This signal is referred to AGND.
NOTES
1. THE ADP1043A HAS AN EXPOSED THERMAL PAD ON THE UNDERSIDE
OF THE PACKAGE. FOR INCREASED RELIABILITY OF THE SOLDER
JOINTS AND MAXIMUM THERMAL CAPABILITY, IT IS RECOMMENDED
THAT THE PAD BE SOLDERED TO THE PCB GROUND PLANE.
ACSNS
AGND
PGND
CS2–
CS2+
CS1
VS2
VS1
1
2
3
4
5
6
7
8
Figure 3. Pin Configuration
(Not to Scale)
Rev. 0 | Page 9 of 72
PIN 1
INDICATOR
TOP VIEW
24 SHAREi
23 SHAREo
22 PGOOD1
21 PGOOD2
20 FLAGIN
19 PSON
18 SDA
17 SCL
COMMONMODE
COMMONMODE
− 1)/100 μA. A 0.1% resistor must be
− 1)/100 μA. A 0.1% resistor must
ADP1043A