VPS13 View Datasheet(PDF) - SANYO -> Panasonic
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VPS13 Datasheet PDF : 4 Pages
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VPS13
VPS13 Thermal Design Example
Conditions: Using an fH = 100 kHz class monitor, fV = 130 MHz (clock)
VCC = 80 V, VBB = 10 V, VOUT = 40 Vp-p (CL = 10 pF)
Here we consider the case where this class of monitor is operated up to Ta = 60°C at a maximum clock frequency of
f = 130 MHz.
As mentioned previously, the chip with the largest loss is transistor 3 (Tr3) of the emitter-follower stage. Determining
that value gives:
Pc (emitter-follower stage) = 6.8 × 0.22 ≈ 1.5 [W] .....................(5)
Now, determine ∆Tj by substituting the value for θj-c in equation (5).
∆Tj = 1.5 × 30 = 45 [°C]
Here, ∆Tj < 50°C, and we need only consider cases where Tc < 100 °C. Therefore, we must design a θh for the heat sink
such that the Tc < 100°C condition holds when three channels are operating at maximum levels, i.e., Pd(TOTAL) =
Pd(one channel) × 3.
∆Tc will be 100 – 60 = 40 °C, and therefore:
θh = ∆Tc ÷ Pd (TOTAL) = 40 ÷ (6.8 × 3) = 2.0, i.e. θh = 2.0 °C/W
In actual practice, the ambient temperature and operating conditions will allow a heat sink smaller than that indicated by
this calculation to be used. Therefore, design optimization taking the actual conditions and the above data into account is
also required.
VCC (V)
80
VBB (V)
10
VOUT (V)
40
VO (center)
45
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of August, 1997. Specifications and information herein are subject to
change without notice.
No. 5548-4/4
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