поискавой системы для электроныых деталей |
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SS6652CSTR датащи(PDF) 4 Page - Silicon Standard Corp. |
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SS6652CSTR датащи(HTML) 4 Page - Silicon Standard Corp. |
4 / 6 page www.SiliconStandard.com 4 of 6 SS6652 n PIN DESCRIPTIONS PIN 1: VIN - Input supply voltage (2.4V~7V) PIN 2: VREF - Reference output (1.22V). Bypass with a 0.047 µF capacitor to GND. Sourcing capability is guaranteed to be greater than 250 µA. PIN 3: SHDN- Logic input to shutdown the chip. >1.5V = normal operation, GND = shutdown In shutdown mode DLOW and DHI pins are at high level. PIN 4: FB - Feedback signal input to sense ground. Connecting a resistor R1 to VOUT and a resistor R2 to VREF pin yields the output voltage: VOUT = - (R1/R2 ) x VREF PIN 5: GND - Power ground. PIN 6: DLOW - Driver sinking output. Connected to DHI when using an external P- channel MOSFET. When using an external PNP bipolar transistor, connect a resistor RB from this pin to DHI. RB value depends on VIN, inductor and PNP bipolar transistor. By adjusting the RB value, efficiency can be optimized. PIN 7: DHI - Driver sourcing output. Connect to gate of the external P-channel MOSFET or base of the PNP bi- polar transistor. PIN 8: CL - Current-limit input. This pin clamps the switch peak current to prevent over-current damage to the external switch. n APPLICATION INFORMATION 2 4 6 8 0 0.2 0.4 0.6 0.8 100 µH 120 µH 150 µH 180 µH 220 µH VIN (V) Max. Output Power vs VIN Inductor Value Typical Application Circuit The typical application circuit generates an adjustable negative voltage for contrast bias of LCD displays. Ef- ficiency and output power can be optimized by using appropriate inductor and switch. The following formu- lae provide a guideline for determining the optimal component values: L = (11.1 0.15 V ) V I V IN IN OUT OUT − × × × PNP : V V V CEO IN OUT > + I 200 I V C, MAX OUT IN ≥ × V 0. 4 V at I = 200 I V CE C OUT IN < × and 10 β = RB ≅ 3 x L x (V IN - 0.8) where, VIN(V), VOUT(V), IOUT(A), L(µH), RB(Ω) Rev.2.01 6/26/2003 |
Аналогичный номер детали - SS6652CSTR |
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Аналогичное описание - SS6652CSTR |
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