NCV97311MW50AGEVB ONSEMI | Alldatasheet
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© Semiconductor Components Industries, LLC, 2019 April, 2019 − Rev. 0
1 Publication Order Number:
Board User's/C8201Manual
Description
The NCV97311A is 3 −output regulator consisting of a low −Iq battery−connected 3 A 2 MHz non −synchronous switcher and two low−voltage 1.5 A 2 MHz synchronous switchers; all using integrated power transistors. The high−voltage switcher is capable of converting a 4.1 V to 18 V battery input to a 5 V output at a constant 2 MHz switching frequency, delivering up to 3 A. In overvoltage conditions up to 36 V , the switching frequency folds back to 1 MHz; in load dump conditions up to 45 V the regulator shuts down. The output of the battery−connected buck regulator serves as the low voltage input for the 2 synchronous switchers. Each downstream output is adjustable from 1.2 V to 3.3 V , with a 1.5 A current limit and a constant 2 MHz switching frequency. Each switcher has independent enable and reset pins, giving extra power management flexibility. For low−Iq operating mode the low−voltage switchers are disabled, and the standby rail is supplied by a low−Iq LDO (up to 150 mA) with a typical Iq of 30 /C0109A. The LDO regulator is in parallel to the high−voltage switcher, and is activated when the switcher is forced in standby mode. All 3 SMPS outputs use peak current mode control with internal slope compensation, internally −set soft −start, battery undervoltage lockout, battery overvoltage protection, cycle −by−cycle current limiting, hiccup mode short−circuit protection and thermal shutdown. An error flag is available for diagnostics. Key Features
- Low Quiescent Current in Standby Mode
- 2 Microcontroller Enabled Low V oltage Synchronous Buck Converters
- Large Conversion Ratio of 18 V to 3.3 V Battery Connected Switcher
- Wide Input of 4.1 to 45 V with Undervoltage Lockout (UVLO)
- Fixed Frequency Operation Adjustable from 2.0 to 2.6 MHz
- Internal 1.5 ms Soft−starts
- Cycle−by−cycle Current Limit Protections
- Hiccup Overcurrent Protections (OCP)
- Individual Reset Pins with Adjustable Delays
- These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS Compliant Typical Applications
- Infotainment, Body Electronics, Telematics, ECU www.onsemi.com EVAL BOARD USER’S MANUAL
Figure 1. Evaluation Board Photo
Figure 2. NCV9731150A Block Diagram
Figure 3. Typical Application Table 1. EVALUATION BOARD TERMINALS
Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND) should not be assumed, damage may occur and reliability may be affected. Table 3. ELECTRICAL CHARACTERSITICS (TA = 25°C, 4.5 ≤ VIN ≤ 18 V, IOUT ≤ 2 A, unless otherwise specified)
2.0 MHz
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
Figure 4. NCV97311AGEVB 5.0 V Board Schematic Place CIN0, L0, CIN1, CIN2 on VBAT side.
- Connect a dc input voltage, within the 6.0 V to 36
V range, between VBAT and GND.
- Connect a load (< 150 mA) between VOUT1 and
- Connect a dc enable voltage, within the 2.0 V to
a. The VOUT1 signal should be 5.0 V . (regardless of EN2 state) and read 0 V . (regardless of EN3 state) and read 0 V .
- Connect a dc enable voltage, within the 2.0 V to
may now add a higher load to VOUT1.
- Connect a dc enable voltage, within the 2.0 V to
connect EN2 directly to VOUT1. The VOUT2 signal should be 3.3 V .
- Connect a dc enable voltage, within the 2.0 V to
connect EN3 directly to VOUT1. The VOUT3 signal should be 1.2 V . Figure 5. NCV97311A Board Connections
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APPLICATION INFORMATION
The voltage outputs for switcher 2 and switcher 3 are adjustable and can be set with a resistor divider. The FB reference for both switchers is 1.2 V . VOUT 2 (VOUT 3) FBx = 1 . 2 V R UPPER R LOWER The upper resistor is set to 10 k /C0087 and is part of the feedback loop. To maintain stability over all conditions, it is recommended to change the only the lower feedback resistor to set the output voltage. Use the following equation: RLOWER /C0043RUPPER VFB VOUT/C0042VFB Some common setups are listed below: Desired Output (V) VREF (V) RUPPER (k/C0087, 1%) RLOWER (k/C0087, 1%) 1.2 1.2 10.0 NP 1.5 1.2 10.0 40.0 1.8 1.2 10.0 20.0 2.5 1.2 10.0 9.31 3.3 1.2 10.0 5.76 Spread Spectrum In SMPS devices, switching translates to higher efficiency. Unfortunately, the switching leads to a much noisier EMI profile. We can greatly decrease some of the radiated emissions with some spread spectrum techniques. Spread spectrum is used to reduce the peak electromagnetic emissions of a switching regulator. fc 9fc7fc5fc3fc fc 9fc7fc5fc3fct t V V Time Domain Frequency Domain Unmodulated The spread spectrum used in the NCV97311A is an “up−spread” technique, meaning the switching frequency is spread upward from the 2.0 MHz base frequency. For example, a 5 % spread means that the switching frequency is swept (spread) from 2.0 MHz up to 2.1 MHz in a linear fashion – this is called the modulation depth. The rate at which this spread takes place is called the modulation frequency. For example, a 10 kHz modulation frequency means that the frequency is swept from 2.0 MHz to 2.1 MHz in 50 /C0109s and then back down from 2.1 MHz to 2.0 MHz in 50 /C0109s.
open circuit when using spread spectrum. Figure 6. Efficiency for SW1 with a 5.0 V Output
www.onsemi.com SCHEMATIC (5.0 V) (3.3 V) (1.2 V) Place CIN0, L0, CIN1, CIN2 on VBAT side. Place CIN3 close to VINL (pin 29) Place CIN4 close to VBAT (pin 1) Place close to VIN2 50V Place close to VIN2 Place GND near ERRB for logic reference. Place CIN5 on bottom of PCB BST3 VOUT3 VOUT2 ROSC SW1 VBAT_IC STBYB RMIN EN2 ERRB RST2B RST3B EN FB3 EN3 FB2 VIN2 BST2 COMP1 VOUT1 VBAT SW3 VIN2 VIN2 RST1B SW2 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VIND RCOMP1 12.4K RFB3L DNP SW2 ERRB NCV97311MW50AR2G VBAT1 EN2 STBY3 RDEPTH4 RMOD5 RST16 COMP17 ROSC8 ERR9 EN2 10 RST211 GND112 RST313 FB3 14 EN3 15 BST316 GND3 17 SW3L 18 SW3H 19 VDRV2 20 VIN3 21 VIN2 22 SW2 23 GND2 24 BST225 FB227 VOUT28 VINL29 BST130 VDRV131 SW132 RMIN26 EPAD33 VOUT3 EN2 RMIN3 100 VOUT2 RDEPTH DNP CIN3 1 uF RST3B SW3 1 2 CIN1 4.7 uF RSNB3 10.0 CIN2 4.7 uF NRVB440MFS VOUT1 VBAT_1 RST1B VIN2 0.1 uF CDRV1 0.22 uF FB2 1.0 uH L3 1.0 uH TP1 10K VBAT CSNB3 100 pF 0.0 ROSC DNP CIN5 100 uF COMP1 10K 0.0 CO15 4.7 uF DRV1 COUT21 10 uF FB3 TP2 SW1 CCOMP2 22 pF GND3 L2 2.2 uH 0.0 GND2 RMIN GND1 ENGND0 RMIN1 100 100 pF CBST3 0.1 uF RFB2L 5.76K RFB3U 10K VOUT1 RSNB2 10.0 VOUT3 COUT12 10 uF VOUT2 COUT11 10 uF 100 pFJ41 2 CIN0 4.7 uF 4.7 uH 10K COUT32 10 uF RST2B COUT31 10 uF CSNB2 100 pF RMOD DNP CIN4 2.2 uF 10K COUT22 10 uF CO14 1 uF CCOMP1 330 pF RMIN2 100 CBST1 0.22 uF RFB2U 10K GND STBYB CBST2 0.1 uF EN3 TP3 CDRV2 0.47 uF COUT13 10 uF
Table 4. BILL OF MATERIALS
4 CAP CER 100 pF
50 V 5% NP0 0603
50 V 10% X7R 0603
16 V 10% X7R 0603
50 V 10% X7R 1206
50 V 20% SMD
16 V 10% X7R 0805
7 CAP CER 10 /C0109F
10 V 10% X7R 1206
0603 SMD
1206 SMD
3 RES 100 /C0087 1/4 W
4.0 A 40 V SMB
Table 4. BILL OF MATERIALS (continued) Part NumberManufacturerFootprintToleranceValueDescriptionQty.
21 PIN INBOARD
8 CONN JACK
4 CONN JUMPER
9 CIRCUIT PIN
4 Do Not Populate 603 Yes
NOTE: All devices are RoHS Compliant.
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