ISL97634 Intersil Corporation, ISL97634 Datasheet
ISL97634
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ISL97634 Summary of contents
Page 1
... PWM dimming signal that minimizes system disturbance. The ISL97634 is available in the 8 Ld TDFN (2mmx3mm) package. There are 14V, 18V, and 26V OVP options that are suitable for 3 LEDS, 4 LEDs, and 6 LEDs backlight applications respectively. The ISL97634 is specified for operation over the -40° ...
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... Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . +125°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Lead Temperature (Soldering 10s +300° PWM/EN CONDITION PWM/EN = 3V, enabled, not switching PWM/EN = 0V, disabled ILX = 100mA VLX = 28V VFB = 95mV IDIODE = 100mA +25°C A ISL97634IRT14Z ISL97634IRT18Z ISL97634IRT26Z θ θ (°C/ MIN TYP MAX 2.4 5.5 0.8 1.5 1 1,300 ...
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... FB Disconnect Switch. Connect to the cathode of the bottom LED if the output current to be PWMed. 7 VOUT Output Pin. Connect to the anode of the top LED and the output filter capacitor Switching Pin. Connect to inductor. 3 ISL97634 L PWM/EN ISL97634 PWM LOGIC FET CONTROLLER DRIVER CURRENT SENSE GM AMPLIFIER 95mV DESCRIPTION ...
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... FIGURE 3. LOAD REGULATION (V 100 6 LEDs 1kHz 80 RSET = 4Ω 10µ 20kHz 20 10 32kHz DUTY CYCLE (%) FIGURE 5. DIMMNG LINEARITY (FB VOLTAGE) vs DUTY CYCLE 4 ISL97634 1.0 0.8 0.6 4 LEDs, 10µH 0.4 6 LEDs, 10µH 0.2 ILED_peak = 25mA 0.0 RSET = 4Ω 1kHz PWM -0.2 80 100 FIGURE 2. QUIESCENT CURRENT vs V 19.76 19.74 19.72 19.70 19.68 19.66 19 ...
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... -------------- - = LED R SET PWM Dimming The ISL97634’s PWM/EN pin can be tied permanently to high for a fixed current operation. On the other hand, the ISL97634 can be applied with an external PWM signal to 5 ISL97634 PWM/ ILED R1 = 4Ω 22µH V OUT ...
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... FIGURE 13. PWM DIMMING AT 1kHz USING FBSW Overvoltage Protection The ISL97634 comes with overvoltage protection. The OVP trip points are at 14V, 18V, and 26V for ISL97634IRT14Z, ISL97634IRT18Z, and ISL97634IRT26Z respectively. The maximum numbers of LEDs and OVP threshold are shown in Table 1. When the device reaches the OVP, the LX stops switching, disabling the boost circuit until V below the OVP threshold ...
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... ISL97634 ISL97634 has internal compensation network that ensures the device operates reliably under the specified conditions. The internal compensation and the highly integrated MAX ILED functions of the ISL97634 make it a design friendly device to 3 70mA be used in high volume, high reliability applications. 4 ...
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... ISL97634 LX node connecting to the drain of the internal switch. When the internal switch turns on, it pulls the source of M1 down to ground, and LX conducts as C3 0.22µ ...
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... IN 9 ISL97634 The SEPIC works as follows; assume the circuit in Figure 18 D0 operates normally, when the ISL97634 internal switch opens C3 4.7µ and the PWM off state, after a short duration where few 10BQ100 D1 LC time constants elapsed, the circuit is considered in the ...
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... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 10 ISL97634 L8.2x3A 0.15 C ...