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ADP1046 データシート(PDF) 11 Page - Analog Devices

部品番号 ADP1046
部品情報  Digital Controller for Isolated
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ADP1046 データシート(HTML) 11 Page - Analog Devices

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Data Sheet
ADP1046
Rev. 0 | Page 11 of 96
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
PIN 1
INDICATOR
1
VS2
2
AGND
3
VS1
4
CS2–
5
CS2+
6
ACSNS
7
CS1
8
PGND
24 SHAREi
23 SHAREo
22 PGOOD1
21 PGOOD2
20 FLAGIN
19 PSON
18 SDA
17 SCL
ADP1046
TOP VIEW
(Not to Scale)
NOTES
1. THE ADP1046 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 AGND PLANE.
Figure 4. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
VS2
Power Supply Output Voltage Sense Input. This signal is referenced to PGND and is the 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.
2
AGND
Analog Ground. This pin is the ground for the analog circuitry and the return for the VDD pin of the ADP1046.
3
VS1
Local Output Voltage Sense Input. This signal is referenced to PGND. 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.
4
CS2−
Inverting Differential Current Sense Input. Nominal voltage at this pin should be 1 V for best operation. When
using low-side current sensing, place a 5 kΩ resistor between the sense resistor and this pin. When using high-
side current sensing in a 12 V application, place a 5.5 kΩ resistor between the sense resistor and this pin. When
using high-side current sensing with a voltage other than 12 V, use this formula to calculate the resistor value:
R = (VOUT − 1)/2 mA. A 0.1% resistor must be used to connect this circuit. If this pin is not used, connect it to PGND
and set CS2± to high-side current sense mode (set Bit 2 of Register 0x27). It is recommended that a 500 pF to
1000 pF capacitor be connected either across the resistor or from this pin to AGND.
5
CS2+
Noninverting Differential Current Sense Input. Nominal voltage at this pin should be 1 V for best operation.
When using low-side current sensing, place a 5 kΩ resistor between the sense resistor and this pin. When using
high-side current sensing in a 12 V application, place a 5.5 kΩ resistor between the sense resistor and this pin.
When using high-side current sensing with a voltage other than 12 V, use this formula to calculate the resistor
value: R = (VOUT − 1)/2 mA. A 0.1% resistor must be used to connect this circuit. If this pin is not used, connect it
to PGND and set CS2± to high-side current sense mode (set Bit 2 of Register 0x27). It is recommended that a
500 pF to 1000 pF capacitor be connected either across the resistor or from this pin to AGND.
6
ACSNS
AC Sense Input. This input is connected upstream of the main output inductor through a resistor divider
network. The nominal voltage for this circuit is 0.45 V. This pin is also connected to the voltage feedforward
ADC (nominal voltage 1 V). This signal is referenced to PGND.
7
CS1
Primary Side Current Sense Input. This pin is connected to the primary side current sensing ADC and to the fast
OCP comparator. This signal is referenced to PGND. The resistors on this input must have a tolerance specification
of 0.5% or better to allow for trimming. If this pin is not used, connect it to PGND.
8
PGND
Power Ground. This pin is the ground connection for the main power rail of the power supply and is the
reference for all voltage and current sensing other than CS2± and VS3±. Star connect to AGND.
9
SR1
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 referenced to AGND.
10
SR2
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 referenced to AGND.
11
OUTA
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referenced to AGND.
12
OUTB
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referenced to AGND.


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