PDF TEA1611T Data sheet ( Hoja de datos )

Número de pieza	TEA1611T
Descripción	Zero voltage switching resonant converter controller
Fabricantes	NXP Semiconductors
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No Preview Available ! TEA1611T Zero voltage switching resonant converter controller Rev. 01 — 7 September 2009 Product data sheet 1. General description The TEA1611T is a monolithic integrated circuit implemented in a high voltage Diffusion Metal Oxide Semiconductor (DMOS) process, which is a high voltage controller for a zero voltage switching resonant converter. The IC provides the drive function for two discrete power MOSFETs in a half-bridge conﬁguration. It also includes a level-shift circuit, an oscillator with accurately programmable frequency range, a latched shut-down function and a transconductance error ampliﬁer. To guarantee an accurate 50 % switching duty factor, the oscillator signal passes through a divide-by-two ﬂip-ﬂop before being fed to the output drivers. The circuit is very ﬂexible and enables a broad range of applications for different mains voltages. VAUX TEA1611 Vhs bridge voltage supply (high side) MOSFET SWITCH HALF- BRIDGE CIRCUIT RESONANT CONVERTER signal ground Fig 1. Basic conﬁguration power ground 014aaa681 2. Features I Integrated high voltage level-shift function I Integrated high voltage bootstrap diode I Low start-up current (green function) I Adjustable non-overlap time I Internal OverTemperature Protection (OTP) I OverCurrent Protection (OCP) that activates a shut-down timer 1 page NXP Semiconductors TEA1611T Zero voltage switching resonant converter controller 7. Functional description 7.1 Start-up When the applied voltage at VDD reaches VDD(init) (see Figure 4), the low side power switch is turned on while the high side power switch remains in the non-conducting state. This start-up output state guarantees the initial charging of the bootstrap capacitor (Cboot) used for the ﬂoating supply of the high side driver. During start-up, the voltage on the frequency capacitor pin (CF) is zero and deﬁnes the start-up state. The voltage at the soft start pin (CSS) is set to 2.5 V. The CSS pin voltage is copied to the VCO pin via a buffer and switching starts at about 80 % of the maximum frequency at the moment VDD reaches the start level. The start-up state is maintained until VDD reaches the start level (13.5 V), the oscillator is activated and the converter starts operating. VDD 0 GH-SH 0 VDD(startup) VDD(init) GL 0 Fig 4. Start-up t 014aaa036 7.2 Oscillator The internal oscillator is a current-controlled sawtooth oscillator. The frequency of the sawtooth is determined by the external capacitor Cf and the currents ﬂowing into the IFS and IRS pins. The minimum frequency and the non-overlap time are set by the capacitor Cf and the resistors Rf(min) and Rno. The maximum frequency is set by resistor R∆f (see Figure 7). The oscillator frequency is exactly twice the bridge frequency to achieve an accurate 50 % duty factor. An overview of the oscillator and driver signals is given in Figure 5. TEA1611T_1 Product data sheet Rev. 01 — 7 September 2009 © NXP B.V. 2009. All rights reserved. 5 of 18 5 Page NXP Semiconductors TEA1611T Zero voltage switching resonant converter controller Table 5. Characteristics …continued All voltages are referred to the ground pins which must be connected externally; positive currents ﬂow into the IC; VDD = 13 V and Tamb = 25 ˚C; tested using the circuit shown in Figure 7, unless otherwise speciﬁed. Symbol Parameter Conditions Min Typ Max Unit VDD(reg) VDD regulation supply voltage supply voltage Vrst reset voltage IDD supply current VAUX = 17 V current capability series regulator; VCC(AUX) = 17 V; IDD = 50 mA clamp voltage in shut-down state; low side on; high side off; IDD = 1 mA start-up - - 11.0 4.5 [1] 210 12.6 12 12.0 5.3 260 - - 13.0 6.0 310 V V V V µA operating shut-down - 2.4 - mA - 220 270 µA Reference voltage on pin VREF Vref reference voltage Iref = 0 mA Iref reference current source only Zo output impedance Iref = −1 mA TC temperature coefﬁcient Iref = 0 mA; Tj = 25 °C to 150 °C Current controlled oscillator pins IRS, IFS, CF 2.9 3.0 3.1 −2.0 - - - 5.0 - - −0.3 - V mA Ω mV/K Ich(CF)min minimum charge current on IIRS = 15 µA; VCF = 2 V 28 30 32 µA pin CF Ich(CF)max maximum charge current on IIRS = 200 µA; VCF = 2 V 340 380 420 µA pin CF VIRS Idch(CF)min Idch(CF)max voltage on pin IRS minimum discharge current on pin CF maximum discharge current on pin CF IIRS = 200 µA IIFS = 50/16 µA; VCF = 2 V IIFS = 1/16 µA; VCF = 2 V 590 620 650 mV 47 50 53 µA 0.89 0.94 0.99 mA VIFS voltage on pin IFS fbridge(min) minimum bridge frequency IIFS = 1/16 mA Cf = 100 pF; IIFS = 0.5/16 mA; IIRS = 50 µA; fbridge = -f---O--2--S---C- 570 600 630 mV 156 167 178 kHz fbridge(max) maximum bridge frequency Cf = 100 pF; IIFS = 1/16 mA; IIRS = 200 µA; fbridge = -f---O----S---C- 2 [2] 395 440 485 kHz Vtrip(L) Vtrip(H) LOW-level trip voltage HIGH-level trip voltage pin CF; DC level pin CF; DC level - 1.27 - V - 2.97 - V TEA1611T_1 Product data sheet Rev. 01 — 7 September 2009 © NXP B.V. 2009. All rights reserved. 11 of 18 11 Page

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