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L7582 Datasheet(PDF) 11 Page - Agere Systems |
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L7582 Datasheet(HTML) 11 Page - Agere Systems |
11 / 16 page Lucent Technologies Inc. 11 Data Sheet November 1999 L7582 Tip Ring Access Switch Protection (continued) Integrated SLIC Protection (continued) External Secondary Protector With the above integrated protection features, only one overvoltage secondary protection device on the loop side of the L7582 is required. The purpose of this device is to limit fault voltages seen by the L7582 so as not to exceed the breakdown voltage or input-output isolation rating of the device. To minimize stress on the L7582, use of a foldback- or crowbar-type device is rec- ommended. A detailed explanation and design equa- tions on the choice of the external secondary protection device are given in the An Introduction to L758X Series of Line Card Access Switches Applica- tion Note. Basic design equations governing the choice of external secondary protector are given below: s |VBATmax| + |Vbreakovermax| < |Vbreakdownmin(break)| s |Vringingpeakmax | + |VBATmax| + |Vbreakovermax| < |Vbreakdownmin(ring)| s |Vringingpeakmax| + |VBATmax| < |Vbreakovermin| where: VBATmax—Maximum magnitude of battery voltage. Vbreakovermax—Maximum magnitude breakover volt- age of external secondary protector. Vbreakovermin—Minimum magnitude breakover voltage of external secondary protector. Vbreakdownmin(break)—Minimum magnitude breakdown voltage of L7582 break switch. Vbreakdownmin(ring)—Minimum magnitude breakdown voltage of L7582 ring access switch. Vringingpeakmax—Maximum magnitude peak voltage of ringing signal. Series current-limiting fused resistors or PTCs should be chosen so as not to exceed the current rating of the external secondary protector. Refer to the manufac- turer’s data sheet for requirements. Table 12. Electrical Specifications, Protection Circuitry * Previous versions of this data sheet specified a Trigger Current of 50 mA minimum. Trigger Current is defined as the minimum current drawn from tip and ring to turn on the SCR. The specification in this data sheet is Gate Trigger Current, which is defined as the maximum current that can flow into the battery before the SCR turns on. † Typical at 25 °C. ‡ Twice ± dynamic current limit of break switches. § In some instances, the typical ON-state voltage can range as low as –25 V. Parameters Related to Diodes (in Diode Bridge) Parameter Test Condition Measure Min Typ Max Unit Voltage Drop @ Continuous Cur- rent (50 Hz/60 Hz) Apply ±dc current limit of break switches Forward Voltage —— 3 V Voltage Drop @ Surge Current Apply ±dynamic cur- rent limit of break switches Forward Voltage —5 — V Parameters Related to Protection SCR Surge Current — — — — ‡ A Gate Trigger Current*† —— — 25 50 mA Gate Trigger Current† Temperature Coefficient — — — –0.5 — %/°C Hold Current — — 70 — — mA Gate Trigger Voltage Trigger current — VBAT – 4 — VBAT – 2 V Reverse Leakage Current VBAT —— — 1.0 µA ON-State Voltage§ 0.5 A, t = 0.5 µs 2.0 A, t = 0.5 µs VON — — — –3 –5 — — V V |
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