ADP1055ACPZ-R7 View Datasheet(PDF) - Analog Devices
Part Name
Description
Manufacturer
ADP1055ACPZ-R7 Datasheet PDF : 140 Pages
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Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADP1055
OVP 1
VS+ 2
VS– 3
CS2+ 4
CS2– 5
NC 6
VFF 7
CS1 8
ADP1055
TOP VIEW
(Not to Scale)
24 ISHARE
23 SMBALRT
22 SDA
21 SCL
20 CTRL
19 GPIO1
18 GPIO2
17 GPIO3
NOTES
1. NC = NO CONNECT. LEAVE THIS PIN UNCONNECTED.
2. FOR INCREASED RELIABILITY OF THE SOLDER JOINTS AND
MAXIMUM THERMAL CAPABILITY, IT IS RECOMMENDED THAT
THE EXPOSED PAD ON THE UNDERSIDE OF THE PACKAGE BE
SOLDERED TO THE PCB AGND PLANE.
Figure 4. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
1
OVP
Overvoltage Protection. This signal is referenced to AGND and is used for redundant OVP protection. The nominal
voltage at this pin should be 1 V. If this pin is not used, connect it to AGND.
2
VS+
Noninverting Voltage Sense Input. This signal is referenced to VS−. The nominal input voltage at this pin is 1 V. The
resistor divider on this input must have a tolerance specification of 0.5% or better to allow for trimming. This pin is
the input to the high frequency flash ADC.
3
VS−
Inverting Voltage Sense Input. There should be a low ohmic connection to AGND. The resistor divider on this input
must have a tolerance specification of 0.5% or better to allow for trimming. To reduce common-mode noise, connect
a 0.1 μF capacitor from VS− to AGND.
4
CS2+
Noninverting Differential Current Sense Input. This signal is referenced to CS2−. If this pin is not used, connect it to
AGND.
5
CS2−
Inverting Differential Current Sense Input. If this pin is not used, connect it to AGND. This pin must have a low
ohmic connection to AGND thought the sense resistor.
6
NC
No Connect. Leave this pin unconnected.
7
VFF
Voltage Feedforward. Two optional functions can be implemented using this pin: feedforward and input voltage
loss detection. This pin is typically connected upstream of the output inductor through a resistor divider network
in an isolated converter. The nominal voltage at this pin should be 1 V. This signal is referenced to AGND. If this pin
is not used, connect it to AGND.
8
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 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.
13
OUTC
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referenced to AGND.
14
OUTD
PWM Output for Primary Side Switch. This pin can be disabled when not in use. This signal is referenced to AGND.
15
SYNC
Synchronization Input Signal. This pin is used as a reference for the internal PWM frequency. This signal is
referenced to AGND and must have a nominal duty cycle of 50%. If this pin is not used, connect it to AGND and
program Register 0xFE55[6] = 1.
16
GPIO4
Programmable General-Purpose Input/Output. If this pin is not used, connect it to AGND. This pin can also be
configured as an active snubber PWM output.
17
GPIO3
Programmable General-Purpose Input/Output. If this pin is not used, connect it to AGND. This pin can also be
configured as an active snubber PWM output.
Rev. A | Page 11 of 140
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