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ADP1071-1 Datasheet(Fiches technique) 10 Page - Analog Devices

Numéro de pièce ADP1071-1
Description  Isolated Synchronous Flyback Controller
Télécharger  27 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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ADP1071-1 Datasheet(HTML) 10 Page - Analog Devices

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ADP1071-1/ADP1071-2
Data Sheet
Rev. B | Page 10 of 27
AGND1
COMP
4
VREG1
5
MODE
6
EN
7
CS
8
RT
9
13
14
15
16
FB
17
OVP
18
VDD2
19
VREG2
20
AGND2
21
22
23
24
1
2
3
TOP VIEW
(TERMINAL SIDE DOWN)
Not to Scale
ADP1071-1
10
11
12
EPAD1
EPAD2
NOTES
1. NC = NO CONNECT.
2. EPAD1 AND EPAD2 ARE INTERNALLY TIED TO
AGND1 AND AGND2, RESPECTIVELY.
Figure 4. ADP1071-1 LGA Pin Configuration
AGND1
COMP
4
VREG1
5
VIN
6
EN
7
CS
8
RT
9
13
14
15
16
FB
17
OVP
18
VDD2
19
VREG2
20
AGND2
21
22
23
24
1
2
3
TOP VIEW
(TERMINAL SIDE DOWN)
Not to Scale
ADP1071-2
10
11
12
EPAD1
EPAD2
NOTES
1. NC = NO CONNECT.
2. EPAD1 AND EPAD2 ARE INTERNALLY TIED TO
AGND1 AND AGND2, RESPECTIVELY.
Figure 5. ADP1071-2 LGA Pin Configuration
Table 10. Pin Function Descriptions, LGA
Pin No.
Mnemonic
Description
ADP1071-1
ADP1071-2
1
1
GATE
Driver Output for the Main Power MOSFET on the Primary Side. GATE is a multifunction pin.
Connect a resistor from the GATE pin to AGND1 to set up the open loop soft start time.
2
2
NC
No Connect.
3
3
NC
No Connect.
4
4
AGND1
Ground for the Primary Side.
5
5
VREG1
8 V Regulated LDO Output for the MOSFET Driver. Connect 1 µF or greater from VREG1 to AGND1.
6
Not
applicable
MODE
Light Load Mode Pin (ADP1071-1 Only). This pin sets the light load mode threshold. Connect the
MODE pin to either AGND1 to enable forced continuous conduction mode (CCM), or to a high
logic (2.5 V or higher) to force an LLM operation, or to a resistor to set up an LLM threshold voltage.
Not
applicable
6
VIN
Input Voltage (ADP1071-2 Only). See the Primary Side Supply, Input Voltage, and LDO section.
Connect a 4.7 µF capacitor to the VIN pin. The size of this capacitor can be reduced if the
input voltage to the VIN pin is guaranteed stable. Reference the VIN pin to AGND1.
7
7
EN
Precision Enable Input. The controller is enabled when EN is above the EN threshold voltage.
The EN pin also has a programmable EN hysteresis. The EN pin is referenced to AGND1.
8
8
CS
Input Current Sensing. The CS pin senses the input PWM current. Place a current sense
resistor between the source terminal of the power MOSFET and AGND1.The current sense
resistor sets up the input current limit. This pin is also used for the external slope compensator.
Connect a resistor from the CS pin to the current sense resistor to generate a voltage ramp for
the slope compensation. Reference the CS pin to AGND1. Connect a 33 pF to 100 pF capacitor
at the CS pin to act as a resistor capacitor (RC) filter along with the slope compensation resistor in
noisy environments.
9
9
RT
Switching Period Resistor. Connect a resistor from the RT pin to AGND1 to set the oscillator
frequency.
10
10
SYNC
Frequency Synchronization. Connect an external clock to the SYNC pin to synchronize the internal
oscillator to this external clock frequency. Connect the SYNC pin to AGND1 if this feature is not
used. The SYNC frequency is recommended to be within 10% of the frequency set by the RT pin.
11
11
NC
No Connect.
12
12
NC
No Connect.
13
13
NC
No Connect.
14
14
NC
No Connect.
15
15
SS2
Soft Start on the Secondary Side. Connect a capacitor from SS2 to AGND2 to set up the soft
start time on the secondary side.
16
16
COMP
Compensation Node on the Secondary Side. This pin is the output of the transconductance
(gm) amplifier. Reference the COMP pin to AGND2.
17
17
FB
Feedback Node on the Secondary Side. Set up the resistive divider from the output voltage
such that the nominal voltage, when the power supply is in regulation, is 1.2 V. Reference the
FB pin to AGND2.


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