Datasheet InnoSwitch-CP (Power Integrations) - 8

InnoSwitch-CP Applications Example
C8 100 pF 250 VAC L2 220 µH
5 V, 9 V, 12 V
2 A
V
C9
OUT
R9 1 nF R8 100 kΩ 100 V 10 Ω C4 1% R11 BD1 C10 C11 1 nF R3 2.4 kΩ ABS210 470 µF 330 270 k µF 500 V Ω 1 R2 D3 16 V 16 V R10 C15 51 Ω SS10100 34 kΩ 1 µF D1 1% 50 V M7 B R1 Q1 51 Ω AO4294
CHY103D
4 U2
BP D+ TM D+ D- FA/P D-
5 L1 30 µH C1 C3 T1
FBD R
10 µF 15 µF PQ20 400 V 400 V C14 R7
GND
C5 470 nF 47 Ω R12 F1 RT1 C2 220 pF ZD1 R4 37.5 kΩ 2 A 5 Ω t
O
10 20 V 5.6 kΩ µF 250 V 250 V 400 V R14 3.9 MΩ
85 - 264
D2
VAC
S1ML C12
L N
C6 C13 2.2 µF 4.7 µF R15 47 pF 50 V 3.9 MΩ R6 R5
D V FWD SR/P VO BPS GND
22 Ω 22 Ω
CONTROL FB
R13 15 mΩ
S BPP IS InnoSwitch-CP
L3 C7 Ferrite U1 100 nF Bead 0 Ω INN2215K 25 V
GND
PI-7856-010716 Figure 15. 5 V, 3 A; 9 V, 2 A; 12 V, 1.5 A QC 3.0 Compliant Charger/Adapter. The circuit shown in Figure 15 is a low cost high efficiency quick current being supplied to the BPP pin of the InnoSwitch-CP IC (U1). charge adapter using INN2215K. This design features DOE Level 6 Output regulation is achieved using On/Off control and the number of and EC CoC 5 compliance. The integration offered by InnoSwitch-CP enabled switching cycles are adjusted based on the output load. At reduces component count from >60 to only 41. The charger provides high load, most switching cycles are enabled, and at light load or 5 V at 3 A, 9 V at 2 A and 12 V at 1.5 A. The output is continuously no-load, most cycled are disabled or skipped. Once a cycle is adjustable in 200 mV increments per the QC 3.0 protocol to set the enabled, the MOSFET will remain on until the primary current ramps output voltage to other values. to the device current limit for the specific operating state. There are four operating states (current limits) arranged such that the frequency Bridge rectifier BR1 rectifies the AC input supply. Capacitors C1, C2 content of the primary current switching pattern remains out of the and C3 provide filtering of the rectified AC input and together with audible range until at light load where the transformer flux density inductor L2 form a pi-filter to attenuate differential mode EMI. and therefore audible noise generation is at a very low level. The Inductor L1 and capacitor C8 provide common mode noise filtering. secondary-side of the InnoSwitch-CP IC provides output voltage, Capacitor C15 connected at the power supply output helps to reduce output current sensing and drive to a MOSFET providing synchronous high frequency radiated EMI. Thermistor RT1 limits the inrush rectification. current when the power supply is connected to the input AC supply. Input fuse F1 provides protection against excess input current The secondary of the transformer is rectified by diode D3 and filtered resulting from catastrophic failure of any of the components in the by capacitors C10 and C11. High frequency ringing during switching power supply. transients that would otherwise create radiated EMI is reduced via a snubber (resistor R8 and capacitor C9). To reduce dissipation in the One end of the transformer primary is connected to the rectified DC diode D3, synchronous rectification (SR) is provided by MOSFET Q1. bus; the other is connected to the drain terminal of the MOSFET The gate of Q1 is turned on by secondary-side control er inside IC U1, inside the InnoSwitch-CP IC (U1). A low-cost RCD clamp formed by based on the winding voltage sensed via resistor R7 and fed into the diode D1, resistors R1, R2 and R3, and capacitor C4 limits the peak FWD pin of the IC. In continuous conduction mode of operation, the drain voltage of U1 at the instant of turn-off of the MOSFET inside U1. MOSFET is turned off just prior to the secondary-side commanding a The clamp helps to dissipate the energy stored in the leakage new switching cycle from the primary. In discontinuous mode of reactance of transformer T1. The InnoSwitch-CP IC is self-starting, operation, the power MOSFET is turned off when the voltage drop using an internal high-voltage current source to charge the BPP pin across the MOSFET fal s below a threshold of approximately -24 mV. capacitor (C7) when AC is first applied. During normal operation the Secondary side control of the primary-side power MOSFET avoids any primary-side block is powered from an auxiliary winding on the possibility of cross conduction of the two MOSFETs and provides transformer T1. Output of the auxiliary (or bias) winding is rectified extremely reliable synchronous rectification. As the SR MOSFET is using diode D2 and filtered using capacitor C6. Resistor R4 limits the
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Rev. F 09/17 www.power.com Document Outline Product Highlights Highly Integrated, Compact Footprint EcoSmart - Energy Efficient Advanced Protection / Safety Features Full Safety and Regulatory Compliance Green Package Applications Description Output Power Table Pin Functional Description InnoSwitch-CP Functional Description InnoSwitch-CP Operation Applications Example Key application Considerations Selection of Components Recommendations for Circuit Board Layout Recommendations for EMI Reduction Recommendations for Audible Noise Suppression Recommendations for Transformer Design Quick Design Checklist Absolute Maximum Ratings Thermal Resistance Key Electrical Characteristics NOTES Typical Performance Characteristics eSOP-R16B Package Package Marking MSL Table ESD and Latch-Up Table Part Ordering Information